My Movement Medicine Cardiac Rehabilitation: Exercise After a Heart Attack (NSTEMI / STEMI) & How to Build Back Safely, Step by Step
- James Pickett
- 1 day ago
- 7 min read
Author: Jamie Pickett, Clinical Exercise Physiologist, Health Facilitator, & Founder of My Movement Medicine.
Length: 7 minute read
Category: Cardiac Rehab, Exercise, Heart Health, Heart Attack
A heart attack is also called a myocardial infarction (MI). It happens when blood flow through a coronary artery is suddenly reduced or blocked, meaning part of the heart muscle doesn’t get enough oxygen and becomes injured.
You may hear two common labels:
STEMI: typically linked with a complete blockage and a clear ECG pattern that triggers urgent emergency treatment.
NSTEMI: still a heart attack (heart muscle damage has occurred), but the ECG pattern differs and the blockage may be partial or intermittent. It is still treated urgently.
Once you’re out of hospital, the question becomes: how do you rebuild fitness without fear, and without rushing it?
If you’re reading this in London, or anywhere else, the safest “default” answer is the same: engage with Phase 3 cardiac rehabilitation, then progress gradually from a confidence-first foundation into long-term routine (Phase 4).
“Start where you are. Use what you have. Do what you can.”
The most important message in this article:
You don’t need to “test yourself” after a heart attack. You need a safe, progressive plan — and the best place to start is cardiac rehabilitation.
The NHS specifically highlights that recovery can take months and you should not rush it, and BHF emphasises cardiac rehab support for getting active safely.
Phase 3 cardiac rehabilitation: the best next step
If you’ve been offered Phase 3 cardiac rehabilitation, take it.
Not because you “should”, but because it’s designed to do three crucial jobs that people struggle to do alone:
Assess risk and symptoms properly (and tailor exercise accordingly).
Rebuild confidence safely with supervised, progressive exercise.
Teach you how to self-manage (pacing, warning signs, progression, and risk factors) so you’re not guessing.
Phase 3 isn’t just exercise classes. It’s the bridge between hospital treatment and normal life.
If you haven’t been offered cardiac rehab, ask your cardiac team or GP how to access it locally.
Anatomy and physiology in plain English
Your heart muscle is supplied by the coronary arteries.
Most heart attacks happen because arteries have developed atherosclerosis (plaque build-up). If a plaque ruptures, a clot can form quickly and block blood flow.
The heart muscle can recover to a degree, but the recovery is supported by:
medication (and sticking with it)
risk factor management
and graded exercise that rebuilds function, confidence, and capacity over time
The first stage is often confidence, not fitness
This is worth saying clearly:
Early recovery is usually about confidence-building first.
Many people feel anxious about:
heart rate going up
breathlessness
chest sensations
“overdoing it”
uncertainty about what is safe
So the goal in the first few weeks is often:
finishing sessions feeling steady
learning what “normal effort” feels like again
proving to yourself you can repeat it tomorrow
Fitness improves as a result of consistency. Confidence is what makes consistency possible.
Risk factors: what to focus on after an MI
Exercise is one pillar of secondary prevention. The other pillars matter too:
Take medication as prescribed.
Blood pressure control.
Cholesterol management.
Blood sugar management where relevant.
Stop smoking if applicable.
Food basics (fibre, plants, healthier fats, less ultra-processed defaults).
Sleep and stress support.
Phase 3 rehab helps you pull these into a realistic, personalised plan.
The structure of safe exercise after a heart attack
A safe session isn’t just “do the workout”. It has a structure that protects your heart and reduces symptoms.
At-home cardiac rehab sessions are typically structured as:
15 minutes warm-up → up to 25 minutes conditioning → 10 minutes cool-down.
ACPICR guidance explains why: graduated warm-up and cool-down reduce the risk of ischaemia, post-exercise hypotension, and rhythm disturbances, and should match the main session intensity.
Warm-up (10–15 minutes)
Warm-up reduces that “shock” feeling and helps the heart and blood vessels adjust gradually.
Aim for:
easy pace at first
gentle mobility (ankles, hips, shoulders)
gradually building up to your planned pace
If you’ve had symptoms with exertion, warm-up becomes even more important.
Conditioning phase (10–30 minutes initially)
This is the main part.
Early on, that often means walking at an easy-to-moderate effort.
The most common mistake is trying to make this part too hard, too soon.
Cool-down (10 minutes)
Cool-down helps your heart rate and blood pressure return gradually.
It also reduces dizziness and that post-exercise “drop-off” feeling some people get.
Finish with:
slower walking
relaxed breathing
a quick check-in: “Do I feel steady?”
Intensity: how hard should it feel?
A simple rule works well for most people:
Build toward moderate intensity over time. Don’t start there.
Moderate intensity is commonly described as:
Able to talk, but not sing.
Early sessions often sit in:
Very light to light (easy conversation, calm breathing),
then gradually build into:
Light-to-moderate,
and only once stable, toward:
Moderate (talk but not sing).
If you use Borg RPE (6–20):
early walking commonly sits around 9–11
building toward 12–14 once routine and confidence are stable
Good sign you’ve chosen the right intensity: you finish feeling like you could do a little more, not wiped out.
Pain and safety: what’s normal vs what means stop
Common and usually normal while rebuilding
mild muscle ache later that day or the next day
mild breathlessness that settles when you slow down
feeling warm or lightly sweaty
Reasons to stop exercising and seek advice
Stop if you get:
chest pain, tightness, pressure, or heaviness
dizziness, faintness, nausea, or feeling unwell
severe or unusual breathlessness
palpitations with symptoms (light-headedness, chest discomfort)
any symptom that feels worrying or different from your normal
If you feel unsafe or symptoms are severe, treat it as urgent and follow emergency guidance.
Building exercise: walking is the safest starting point for most people
Walking is the “default” starting tool because it is:
easy to dose
easy to repeat
easy to progress gradually
psychologically safer than “hard” workouts
It fits the confidence-first stage very well.
FITT principles: how to progress safely
FITT means:
Frequency: how many days per week
Intensity: how hard it feels (talk test / RPE)
Time: how long
Type: what you do (walking is the usual start)
Key rule: progress one FITT principle at a time.
If you increase frequency, time, and intensity in the same week, you increase fatigue and setbacks.
Example walking programme (8 weeks, slow progression)
This is a general example. Phase 3 rehab should individualise it based on symptoms, medications, and assessment results.
Example Weeks 1–2: confidence and routine
Frequency: 5 days per week
Intensity: easy (comfortable conversation)
Time: 10–15 minutes
Type: flat walking
Goal: finish steady and think, “I could do that again tomorrow.”
Example Weeks 3–4: add time (not speed)
Frequency: 5 days per week
Intensity: easy to light
Time: 15–25 minutes (add about 5 minutes to 2–3 walks per week)
Type: flat walking
Progression focus: time only
Example Weeks 5–6: add one purposeful walk
Frequency: 4–5 days per week
Intensity: most walks easy; one walk at talk but not sing
Time: 20–30 minutes
Type: mostly flat, optional gentle incline
Progression focus: one moderate day only
Example Weeks 7–8: gentle intervals (optional)
Only add intervals if you’re stable, confident, and symptom-free at the current level.
Once per week:
10 minutes easy warm-up
6 rounds: 1 minute brisk (talk but not sing) + 2 minutes easy
10 minutes cool-down
Progression focus: small dose of intensity once per week
What to do if you have a “bad week”
This is where people either stay consistent or lose momentum.
Use this rule:
Reduce the load, don’t cancel the habit.
Examples:
keep warm-up + 10 minutes easy walking
drop the purposeful walk for a week
shorten duration but keep frequency
Consistency is the base. Progress resumes once you’re steady again.
MMM tips that make this easier in real life
Warm up longer than you think you need. It reduces anxiety and symptoms.
Use the talk test. It’s simple, reliable, and keeps you out of trouble.
Keep one easy option ready. A 10-minute walk counts.
Progress one variable per week. Time first, then frequency, then small intensity.
Avoid pain and strain. Especially avoid breath-holding and rushing movements.
Track what matters: number of sessions completed and how steady you felt.
Personalised rehabilitation plan
A truly personalised plan depends on things like:
how long since your MI
your treatment (stent / CABG / medication changes)
symptoms and confidence level
heart function and rhythm issues if any
your starting walking tolerance
your goals (return to work, stamina, strength, weight, blood pressure)
Best practice: use Phase 3 rehab assessments as the clinical foundation, then build from there.
If you want a personalised plan from My Movement Medicine
We can create a Phase 4-style plan that complements your clinical rehab (not replaces it), including:
a clear weekly structure (walking + strength + recovery)
individual intensity targets using talk test and Borg RPE
warm-up and cool-down templates
a “what to do if…” plan (fatigue, anxiety, missed week, symptoms)
progressions reviewed every 2–4 weeks
If you’d like a starter plan, send us an email containing:
how many weeks since your MI
whether you’ve started Phase 3 rehab
your current comfortable walking time
…and we'll draft a safe 2-week template you can also sanity-check with your rehab team.
How My Movement Medicine can help
Phase 3 is the priority, and it’s worth doing as fully as possible.
Once Phase 3 finishes (or if access is limited), the biggest gap many people face is: what now?
That’s where community Phase 4 support is useful.
My Movement Medicine can support the long-term maintenance stage by offering:
Phase 4-style guided sessions (in person and online).
Safe progression planning from walking → strength + aerobic structure.
Confidence with intensity using Borg RPE + talk test, so you’re not guessing.
Habit support so exercise stays consistent beyond the “programme period”.
Choose what suits you with our Subscriptions and Plans:
Keep an eye out on our online programmes page for some upcoming ways to move and get healthy
If you’d prefer a more personalised approach, one to one support is available, especially if you want help rebuilding confidence, working around symptoms, or returning to exercise after a health event
Trying a new activity? Approach it the right way with some support from our Activity Specific Guides:
Book recommendations
The Heart Manual (UK cardiac rehabilitation patient workbook; practical, structured, and calming)
Mayo Clinic Cardiac Rehabilitation Manual (excellent education and lifestyle framework)
Move! — Caroline Williams (useful, evidence-informed perspective on why movement matters and how to make it realistic)
Evidence references
BHF on cardiac rehab at home and session structure (warm-up/conditioning/cool-down) and need for rehab assessment.
NICE guidance on acute coronary syndromes, including longer-term rehabilitation and secondary prevention.
NICE CKS: MI secondary prevention emphasising cardiac rehabilitation participation.
BACPR Standards and Core Components (2023) outlining the core model and components of cardiovascular prevention and rehabilitation.
NHS England commissioning standards referencing cardiac rehab core components and implementation.
ACPICR standards for physical activity and exercise within cardiac rehabilitation (safety and best practice).
Cochrane review (2021): exercise-based cardiac rehabilitation for coronary heart disease.
British Heart Foundation: what cardiac rehab is and how it supports recovery.
This health guide was written by Jamie Pickett, Clinical Exercise Physiologist, Health Facilitator, & Founder of My Movement Medicine.
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