91 Seven-Day Beginner Home Fitness Plan
Seven-Day Beginner Home Fitness Plan
This seven-day beginner home fitness plan combines two full-body strength sessions with moderate aerobic activity, mobility, balance practice, and recovery. Most sessions take approximately 15 to 35 minutes and require only a stable chair, open floor space, a wall or countertop, and an optional resistance band or securely loaded backpack.
The plan is intended for adults who are beginning structured exercise, returning after a period of inactivity, or moving from occasional activity toward a more consistent routine. It is not a rehabilitation program, a rapid weight-loss plan, or a test of maximum fitness.
Current United States guidance recommends that adults work toward 150 to 300 minutes of moderate-intensity aerobic activity each week, or 75 to 150 minutes of vigorous activity, plus muscle-strengthening activity on at least two days. Some activity is better than none, and the weekly total can be divided into smaller periods.
A true beginner does not need to reach the complete weekly recommendation during the first seven days. The base version of this plan provides approximately 90 to 125 minutes of planned movement, depending on the options selected. Short walks or indoor activity breaks can gradually bring the total closer to 150 minutes as tolerance and consistency improve.
The main goal of the first week is to finish with enough control and recovery to repeat the process. A plan that feels manageable and can be continued is more useful than an exhausting week followed by several inactive weeks.
Who This Plan Is For
This plan assumes that the participant:
- Can stand, sit, and move through basic daily activities without individualized assistance
- Has enough clear space for a chair and several small steps
- Is not currently following a medically directed exercise or rehabilitation program
- Can modify movements when discomfort or loss of control occurs
- Is willing to begin at an easy or moderate effort instead of treating every session as a challenge
The plan can be adapted for apartments and small rooms. It does not require jumping, running, floor burpees, or loud equipment.
People who use mobility aids, exercise from a seated position, or have disability-related access needs may still use the overall weekly structure, but individual exercises may require more specific adaptation. Adults with chronic conditions or disabilities who cannot meet the general recommendations are encouraged to be as active as their abilities allow and to consult an appropriate healthcare professional or physical activity specialist about suitable activities.
Adults 65 and older should include activities that develop or maintain balance in addition to aerobic and muscle-strengthening work. This plan includes brief balance practice, but anyone with a substantial fall risk should perform it near secure support and may need individualized guidance.
Before Day One
Prepare the Space
Choose an area where the participant can:
- Extend the arms without touching a wall, fan, shelf, or screen
- Take one or two steps in each direction
- Sit on a stable chair that does not roll
- Reach a wall or countertop for support
- Keep children, pets, cables, rugs, and loose objects outside the movement area
Check the floor before every session. A space that was clear yesterday may contain a bag, toy, power cable, or moved piece of furniture today.
Wear clothing that allows comfortable movement. Footwear should match the floor and activity. Supportive shoes may be useful on a hard or slippery surface, while some controlled mobility exercises may be comfortable without shoes when the surface is clean, stable, and appropriate for the participant.
Use the Talk Test
The plan uses mostly easy and moderate effort.
During moderate-intensity aerobic activity, a person can generally talk but not sing. During vigorous activity, speaking more than a few words requires a pause for breath.
For this beginner week:
- Easy effort: Normal conversation is comfortable.
- Moderate effort: Conversation is possible, but breathing is clearly faster.
- Too difficult for the planned session: The participant cannot maintain control, becomes unaware of the room, or cannot recover during the easier period.
There is no need to perform vigorous exercise during this first week.
Use a Movement-Quality Rule
For strength exercises, stop the set when the next repetition would probably require:
- Holding the breath
- Moving much faster or slower than intended
- Losing balance
- Shortening the movement substantially
- Using momentum
- Changing the position of the back, knees, shoulders, or wrists to finish
The participant should usually end a set feeling capable of completing approximately two or three additional controlled repetitions.
The American College of Sports Medicine’s 2026 resistance-training guidance emphasizes that consistency matters more for most healthy adults than complicated programming. Bodyweight exercises, resistance bands, and home-based routines can provide meaningful benefits, and training to complete muscular failure is not required for the average participant.
Choose the Base or Reduced Version
Every day includes a base session. Use the reduced version when the participant is:
- Returning after a long inactive period
- Unsure about recovery
- Short on time
- Learning unfamiliar movements
- Experiencing ordinary mild fatigue without concerning symptoms
The reduced version is not a failure. It is a planned part of the program.
Seven-Day Overview
| Day | Main activity | Base duration | Main purpose |
|---|---|---|---|
| Day 1 | Full-Body Strength A | 25–35 minutes | Learn six foundational movements |
| Day 2 | Moderate Cardio and Mobility | 20–30 minutes | Build continuous aerobic activity |
| Day 3 | Balance, Coordination, and Easy Movement | 15–25 minutes | Practice control while recovering |
| Day 4 | Full-Body Strength B | 25–35 minutes | Repeat major movement patterns |
| Day 5 | Beginner Cardio Intervals | 20–30 minutes | Alternate moderate and easy effort |
| Day 6 | Choice-Based Cardio | 20–35 minutes | Practice an enjoyable activity |
| Day 7 | Recovery and Weekly Review | 10–25 minutes | Reduce fatigue and prepare the next week |
The seven days do not need to begin on Monday. Day 1 can be any day that allows enough time and energy for the first strength session.
Day 1: Full-Body Strength A
Purpose:
Learn the basic movement patterns without training to exhaustion.
Equipment: Stable chair, wall or countertop, optional resistance band or backpack.
Warm-Up: 5–7 Minutes
Perform each movement slowly for approximately 30 to 45 seconds:
- Easy marching or seated marching
- Shoulder rolls
- Step touches
- Supported hip hinges
- Slow sit-to-stands from the chair
- Wall push-ups with a short range
- Gentle trunk turns
A warm-up should gradually increase movement and rehearse the actions that will appear in the workout. It should not create substantial fatigue before the main exercises. A gradual warm-up and cooldown allow breathing and heart rate to rise and fall more progressively.
Main Strength Circuit
Complete one or two sets of each exercise. Rest for approximately 30 to 90 seconds when needed.
1. Chair Sit-to-Stand
Target:
Legs and hips
Repetitions: 6–12
Sit near the front of a stable chair. Place the feet comfortably apart. Lean forward slightly from the hips, press through the feet, and stand. Sit back under control.
Easier: Use the hands lightly on the chair or thighs.
Harder within the beginner range: Touch the chair without fully transferring body weight before standing again.
Do not drop onto the chair or allow the knees to collapse inward.
2. Wall or Countertop Push-Up
Target:
Chest, shoulders, arms, and trunk
Repetitions: 6–12
Place the hands on a wall or secure countertop. Step back until the body forms a straight, comfortable line. Bend the elbows and move the chest toward the surface, then press away.
A wall position is easier than a countertop position. A lower support generally increases the challenge.
Keep the wrists comfortable and the shoulders away from the ears.
3. Resistance-Band or Backpack Row
Target:
Upper back and arms
Repetitions: 8–12
For a resistance-band row, use an anchor and setup specifically approved by the band manufacturer. Pull the handles or band toward the ribs while keeping the shoulders controlled.
For a backpack row, close every zipper, use an even and modest load, support one hand on the chair, and pull the backpack toward the side of the body.
No-equipment alternative: Perform a standing or prone “W” raise by drawing the elbows back gently and squeezing the shoulder blades without forcing the neck. This provides less resistance than a true row but practices upper-back control.
Stop if the anchor, bag, or chair shifts.
4. Supported Hip Hinge
Target:
Hips and back of the legs
Repetitions: 8–12
Stand facing away from a wall with the heels several inches in front of it. Soften the knees and move the hips backward until they lightly touch the wall. Return to standing by pressing the feet into the floor and bringing the hips forward.
The movement should come primarily from the hips rather than a deep knee bend.
5. Standing Calf Raise
Target:
Lower legs and ankle control
Repetitions: 8–15
Stand near a wall or chair. Rise onto the balls of the feet, pause briefly, and lower slowly.
Use support for balance rather than pulling the body upward with the arms.
6. Standing Brace or Dead Bug
Target:
Trunk control
Time or repetitions: 10–20 seconds or 5–8 controlled repetitions per side
For the standing version, place the hands on a wall and gently tighten the trunk while continuing to breathe.
For a floor version, lie on the back with the knees bent and slowly move one heel away from the body before returning it. Keep the movement small enough that the trunk remains controlled.
Optional Finish: 5–10 Minutes
Walk indoors, march, or take an easy outdoor walk.
The effort should remain easy. This is practice in moving after strength training, not an additional test.
Reduced Version
Complete the warm-up and one set each of:
- Sit-to-stand
- Wall push-up
- Row or W raise
- Supported hip hinge
Total time may be approximately 12 to 18 minutes.
Day 2: Moderate Cardio and Mobility
Purpose:
Build a continuous period of comfortable aerobic activity.
Base duration: 20–30 minutes
Choose one activity:
- Brisk walking
- Indoor marching
- Low-impact dance
- Stationary cycling
- Step touches and knee lifts
- Low-impact shadowboxing
- A quiet home cardio video with appropriate modifications
The CDC recommends choosing activities that match the person’s abilities and interests, starting slowly, and increasing duration or challenge over time. Enjoyable and accessible activities are more likely to fit a sustainable routine.
Session Structure
Warm-up:
3–5 minutes at easy effort
Main activity: 12–20 minutes at moderate effort
Cooldown: 3–5 minutes at easy effort
During the main period, use the talk test. The pace should make breathing noticeably faster while allowing conversation.
Indoor Low-Impact Option
Repeat the following sequence:
- March for one minute.
- Step from side to side for one minute.
- Alternate heel taps for one minute.
- March with comfortable arm movement for one minute.
- Walk slowly for one minute.
Repeat two to four times.
Mobility Finish: 5 Minutes
Perform comfortable versions of:
- Ankle circles
- Calf stretch
- Hip-flexor position with a small stance
- Chest-opening movement
- Upper-back rotation
Stretching should create mild tension, not sharp pain or forced range.
Reduced Version
Complete ten minutes of easy-to-moderate walking or marching, followed by two or three mobility movements.
Activity can be divided into smaller periods. The federal guidelines no longer require aerobic activity to occur in blocks of at least ten minutes for it to count toward the weekly total.
Day 3: Balance, Coordination, and Easy Movement
Purpose:
Practice body control without adding another demanding workout.
Base duration: 15–25 minutes
Easy Movement: 5–10 Minutes
Walk, march, or cycle at an easy pace.
Breathing should remain comfortable.
Balance Circuit
Perform the circuit near a wall or stable countertop. Complete one or two rounds.
1. Narrow-Stance Hold
Stand with the feet closer together than usual for 15–30 seconds.
Easier: Use a wider stance or keep both hands near support.
2. Staggered-Stance Hold
Place one foot slightly in front of the other and hold for 15–30 seconds. Repeat with the other foot forward.
The feet do not need to form a straight line.
3. Supported Single-Leg Weight Shift
Shift most of the body weight onto one leg while keeping the toes of the other foot on the floor. Hold for 5–15 seconds, then change sides.
Only lift the foot fully when balance is stable and suitable support is immediately available.
4. Heel-to-Toe or Line Walking
Take four to eight slow steps along an imaginary line.
Easier: Leave space between the heel and the toes rather than touching them.
5. Controlled Step and Return
Step to the side and return to the starting position. Complete five to eight repetitions on each side.
Keep the step small and controlled.
Coordination Option
Perform slow opposite-arm-and-leg marching for 30 seconds, followed by ordinary marching for 30 seconds. Repeat two or three times.
The objective is accuracy, not speed.
Mobility Finish
Add gentle shoulder, hip, and ankle movement for approximately five minutes.
Reduced Version
Complete easy walking and two supported balance exercises.
People with a history of falls, frequent dizziness, significant vision limitations, or neurological conditions affecting balance may need individualized assessment rather than independently progressing these drills.
Day 4: Full-Body Strength B
Purpose:
Train the major muscle groups for a second day using slightly different exercises.
Current guidance recommends muscle-strengthening activity on at least two days each week. The activities should involve the major muscle groups, including the legs, hips, back, abdomen, chest, shoulders, and arms.
Warm-Up: 5–7 Minutes
Use:
- Easy marching
- Shoulder-blade movements
- Supported reverse steps
- Slow hip hinges
- Wall push-ups
- Controlled knee raises
Main Strength Circuit
Complete one or two sets.
1. Supported Split-Stance Squat or Reverse Step
Target:
Legs and hips
Repetitions: 5–10 per side
Stand near a chair or counter. Step one foot backward and bend both knees slightly, keeping most of the movement small and controlled. Return to the start.
Easier: Perform a simple backward toe tap without lowering the body.
Alternative: Repeat the Day 1 chair sit-to-stand.
2. Incline Push-Up
Target:
Chest, shoulders, arms, and trunk
Repetitions: 6–12
Use a wall or countertop. Select a height that allows every repetition to remain controlled.
The participant does not need to use a lower surface simply because it is Day 4.
3. Band Pull or Backpack Row
Target:
Upper back and arms
Repetitions: 8–12
Repeat the safe pulling option used on Day 1, or use a slightly different grip when the equipment permits it.
Avoid fastening a band to furniture that is not designed to resist the pull.
4. Glute Bridge or Standing Hip Extension
Target:
Hips
Repetitions: 8–12
For the bridge, lie on the back with knees bent. Press through the feet and raise the hips only as high as control and comfort allow.
For the standing version, hold a support and move one leg slightly backward without leaning or arching the lower back.
5. Overhead Reach or Light Press
Target:
Shoulders and upper body
Repetitions: 6–10
Reach the arms overhead within a comfortable range.
A light resistance band or very light household object may be used only when it can be controlled securely. A reach without added load is an appropriate starting version.
People with shoulder or neck discomfort should keep the range lower or omit this movement.
6. Bird Dog at Wall or Floor
Target:
Trunk and whole-body control
Repetitions: 5–8 per side
For the wall version, place the hands on a wall and slowly extend one leg backward.
For the floor version, begin on hands and knees and extend one leg, or one arm, rather than moving the opposite arm and leg together immediately.
Keep the movement smaller than the point at which the trunk rotates.
Optional Easy Cardio: 5–10 Minutes
March or walk at an easy pace.
Reduced Version
Perform one set of four exercises:
- Reverse toe tap or sit-to-stand
- Wall push-up
- Row or W raise
- Standing hip extension
Day 5: Beginner Cardio Intervals
Purpose:
Learn to alternate moderate work with easier recovery.
Base duration: 20–30 minutes
An interval workout does not need to be high-intensity interval training. A beginner can alternate moderate movement with easy movement and remain below vigorous intensity.
Warm-Up: 5 Minutes
Walk or march easily, adding gentle arm movement.
Main Interval Set
Complete six to ten rounds:
- Work interval: 30 seconds at moderate effort
- Recovery interval: 60 seconds at easy effort
Choose one work movement:
- Brisk marching
- Faster step touches
- Low-impact knee drives
- Controlled shadowboxing
- Stationary cycling at a moderately faster pace
- Dance steps
- Step-ups on a safe, appropriate platform
Use easy walking or marching for recovery.
The work period should raise breathing without causing frantic movement. The participant should finish each 30-second period knowing that more work would have been possible.
Optional Progression
A participant who recovers easily and maintains control may use 45 seconds of moderate work followed by 60 seconds of easy movement.
Do not shorten recovery and increase speed during the same first-week session.
Cooldown: 3–5 Minutes
Reduce the pace gradually.
Reduced Version
Complete four to six rounds using:
- 20 seconds of moderate movement
- 60–90 seconds of easy recovery
Day 6: Choice-Based Cardio
Purpose:
Identify an enjoyable activity that could become part of a regular routine.
Base duration: 20–35 minutes
Choose one:
- Outdoor walking
- Indoor walking
- Dance and rhythm cardio
- Low-impact aerobics
- Cycling
- Rowing at an appropriate easy-to-moderate setting
- Shadowboxing
- An interactive boxing session
- A family movement game
- A combination of two activities
The session should be mostly moderate, with an easy beginning and ending.
Option A: Continuous Session
- 5 minutes easy
- 15–25 minutes moderate
- 5 minutes easy
Option B: Three Short Blocks
Complete three 7- to 10-minute activity periods during the day.
For example:
- Morning indoor walk
- Afternoon dance or cycling
- Evening easy walk
This approach can be useful when one uninterrupted period is unrealistic.
Interactive Boxing Option
Use controlled jabs, crosses, marching, and step touches. Avoid maximal punching force and stop following cues when posture or room awareness declines.
The focus is continuous movement and enjoyment, not achieving the machine’s highest score.
Optional Add-On
Complete five minutes of mobility or balance work if recovery remains good.
Reduced Version
Choose ten to fifteen minutes of the most accessible activity.
Day 7: Recovery and Weekly Review
Purpose:
Allow fatigue to settle, maintain gentle movement, and prepare the next week.
A recovery day may include easy physical activity. It does not need to involve complete bed rest unless illness, symptoms, or individualized guidance requires it.
Recovery Options
Choose one or two:
- Ten- to twenty-minute easy walk
- Gentle indoor marching
- Comfortable mobility routine
- Light household movement
- Relaxed stretching
- Breathing and posture practice
- Complete rest from planned exercise
Keep the effort easy.
Five-Minute Weekly Review
Write down:
- Which sessions were completed?
- Which session felt most manageable?
- Which movement felt confusing?
- Was there pain, dizziness, or unusual fatigue?
- Did the sessions fit the available time?
- Which activity was most enjoyable?
- What is one adjustment for next week?
Do not judge the week only by whether every planned minute was completed.
A participant who completed both strength sessions and several short activity periods has established a useful foundation, even when the aerobic total remains below the eventual target.
How to Progress After the First Week
Repeat the basic structure for another week before making major changes, especially when the exercises are new.
Choose one progression:
- Add five minutes to one or two cardio days.
- Add one or two repetitions to selected strength exercises.
- Add a second set to an exercise that was previously performed for one set.
- Add one or two cardio intervals.
- Reduce unnecessary pauses while keeping the intended rest periods.
- Use a slightly more challenging push-up surface.
- Increase resistance modestly.
- Add one short walk on a recovery day.
Do not increase session duration, resistance, repetitions, interval count, and movement complexity simultaneously.
CDC guidance recommends beginning with manageable activity and gradually increasing time or challenge. Specific activity times placed into the weekly routine can also make the plan easier to maintain.
A Gradual Aerobic Build
A participant beginning with approximately 90 minutes of weekly moderate activity could progress toward the guideline through steps such as:
- Week 1: Approximately 90 minutes
- Week 2: Approximately 105 minutes
- Week 3: Approximately 120 minutes
- Week 4: Approximately 135 minutes
- Week 5: Approximately 150 minutes
This is an illustrative progression, not a required medical schedule. Some people may progress more slowly, while others may already tolerate 150 minutes.
When Not to Progress
Repeat or reduce the week when:
- Technique became less controlled
- Ordinary soreness interfered substantially with daily activity
- Sleep or daily function worsened
- Joint pain increased
- The schedule felt unmanageable
- Equipment or space problems remained unresolved
- The participant experienced concerning symptoms
Progress is not required simply because seven days have passed.
Substitutions for Common Barriers
No Resistance Band or Weights
Use:
- Chair sit-to-stands
- Wall or countertop push-ups
- Hip hinges
- Glute bridges
- Calf raises
- Wall-supported trunk exercises
- Prone or standing W raises
A securely loaded backpack can provide resistance, but every zipper and handle must be checked. Do not use fragile bags, loose objects, or loads that shift unexpectedly.
Limited Floor Space
Use standing and chair-supported exercises. Replace floor bridges and bird dogs with standing hip extensions and wall-supported trunk work.
Noise Restrictions
Avoid jumping, running in place, dropped weights, and hard punching.
Choose:
- Marching
- Step touches
- Controlled strength exercises
- Walking
- Stationary cycling
- Low-contact shadowboxing
- Slow mobility work
Difficulty Getting to the Floor
Use wall, countertop, chair, and standing versions. Floor exercise is not required for a balanced beginner week.
Limited Time
Use the reduced version of the scheduled session. Preserving its main purpose is more useful than selecting a random intense workout.
Low Motivation
Begin with five minutes. After five minutes, continue only when movement feels appropriate.
The goal is to create an easy starting action, not to promise that every five-minute session will become a long workout.
Common Beginner Mistakes
Starting With the Hardest Exercise Version
A lower push-up surface, deeper squat, faster interval, or heavier backpack is not automatically better.
Use the easiest version that still requires attention and controlled effort.
Adding Extra Work to Every Day
The first week may feel easier than expected. That is intentional.
Do not turn recovery days into hard cardio sessions or add several sets to every strength exercise. Complete the planned week before deciding what needs more challenge.
Ignoring Pulling and Upper-Back Work
Home plans often contain many push-ups but no pulling movement. A resistance band or secure backpack can help create a more balanced program.
Treating Soreness as the Goal
Mild muscle soreness can occur after unfamiliar exercise, but soreness is not required for progress. Sharp pain, joint pain, swelling, or substantial loss of function should not be treated as evidence of an effective session.
Holding the Breath
Continue breathing through strength exercises. Reduce the resistance or stop the set when the participant must strain and hold the breath to finish.
Chasing Calorie Numbers
Machines and watches provide estimates. This plan does not assign calorie targets because actual energy expenditure varies with body size, movement economy, intensity, equipment, and measurement method.
Skipping the Review
The weekly review identifies whether the plan works in the participant’s real home and schedule. Without review, the same avoidable problem may repeat.
Safety and Individual Considerations
Moderate physical activity is safe for most people, but people with chronic health conditions should discuss appropriate activity types and amounts with a healthcare professional. CDC guidance also advises people who have been inactive and plan to begin vigorous activity to seek guidance in relevant circumstances.
This beginner plan is designed to avoid required vigorous exercise, but individual health considerations still matter.
Seek appropriate guidance before or during the program when relevant to:
- Current or recurring chest symptoms
- Recent injury or surgery
- Pregnancy or the postpartum period
- Significant balance problems
- Repeated dizziness or fainting
- Known heart, lung, metabolic, neurological, or joint conditions
- Pain that changes normal movement
- Medication effects that influence exercise tolerance
- Disability-related needs that require individualized modification
Stop exercising and seek appropriate assistance when activity causes chest pressure or pain, fainting, unusual or extreme shortness of breath, sudden weakness, loss of coordination, or another concerning new symptom. Sudden or severe chest discomfort—particularly when accompanied by shortness of breath, nausea, or dizziness—requires urgent medical attention.
General muscle effort, faster breathing, and a temporary rise in heart rate are expected during exercise. Sharp pain, loss of control, and concerning systemic symptoms are not signals to push harder.
This chapter provides general educational information and does not diagnose, treat, or prescribe exercise for an individual medical condition.
Chapter Summary
This seven-day beginner home fitness plan includes two full-body strength days, three aerobic days, one balance-and-coordination day, and one recovery-and-review day. The sessions use simple movements, low-impact cardio, limited equipment, and manageable durations.
The first week does not need to achieve the maximum recommended activity level. Its purpose is to establish a repeatable routine and begin progressing toward the general target of at least 150 minutes of moderate aerobic activity plus two muscle-strengthening days.
Use the talk test to control aerobic effort. End strength sets before movement quality changes, and select easier exercise versions whenever balance, posture, or breathing cannot be maintained.
The reduced sessions are part of the program. They provide practical alternatives for limited time, low energy, small spaces, and the first days of returning to activity.
Progress gradually after the week becomes repeatable. Add one variable at a time, such as several aerobic minutes, a few repetitions, one set, or a modest resistance increase.
The completed week should provide information. Review what fit the schedule, which movements need more practice, and whether the participant recovered well enough to continue.
Related Chapters
- How to Build a Weekly Home Workout Plan
- Bodyweight Exercise for Beginners
- Low-Impact Cardio Workouts at Home
- Home Workout Warm-Ups
- Rest Days and Active Recovery
Sources and Further Reading
Only the following government and professional-organization sources were used. All external links are intentionally marked nofollow.
- Centers for Disease Control and Prevention — Adult Activity: An Overview
- Centers for Disease Control and Prevention — Meeting Physical Activity Recommendations
- Centers for Disease Control and Prevention — Adding Physical Activity as an Adult
- Centers for Disease Control and Prevention — How to Measure Physical Activity Intensity
- Centers for Disease Control and Prevention — Steps for Getting Started With Physical Activity
- Centers for Disease Control and Prevention — Activity for Adults With Chronic Conditions and Disabilities
- Centers for Disease Control and Prevention — Adding Physical Activity as an Older Adult
- Office of Disease Prevention and Health Promotion — Current Physical Activity Guidelines
- Office of Disease Prevention and Health Promotion — Physical Activity Guidelines: Top Ten Things to Know
- American College of Sports Medicine — 2026 Resistance Training Guidelines Update
- American College of Sports Medicine — Creating an Effective Resistance Training Plan
- American Heart Association — Developing a Physical Activity Plan
- American Heart Association — Understanding Chest Pain