Restart Stronger: An Exercise Physiologist's Guide to Exercise After a Cardiac Event
Your heart is a muscle. Like every other muscle in your body, it responds to training, and it loses capacity when you stop using it.
After a heart attack, a stent, bypass surgery or a new diagnosis, most people don't fear the exercise itself. They fear what it might do. So they wrap themselves in cotton wool, walk a little less each week, and slowly lose the fitness that protects them. At In Between Performance, our exercise physiology clinic in Darlinghurst, Sydney, we see it constantly.
The evidence points the other way. Structured, progressive exercise is one of the most powerful tools you have after a cardiac event. Done right, it doesn't just get you back to where you were. It can take you further.
What happens to your body after a cardiac event
The event itself is only part of the story. What follows in the weeks and months after often does as much damage as the event.
Deconditioning. Time in hospital and weeks of rest strip away aerobic fitness and muscle fast. Everyday tasks like stairs, carrying shopping or walking uphill start to feel harder, which feeds the fear.
Fear of exertion. A racing heart or heavy breathing can feel like a warning sign, even when it's a normal response to effort. Many people avoid anything that raises their heart rate.
Lost confidence. Without guidance, people often don't know what's safe. They either do too little for too long, or jump back in too hard.
Unchanged risk factors. Blood pressure, cholesterol, blood sugar and body composition don't fix themselves. Exercise is one of the few levers that moves all of them at once.
Rest has its place in the first days. After that, the plan is to move with structure, not to stay still.
What the evidence says about exercise after a heart attack
Cardiac rehabilitation built around exercise is one of the best-studied treatments in cardiology. In September 2026, Cochrane published its updated review pooling 107 randomised trials and 26,886 people with coronary heart disease. Most had a heart attack, a heart procedure or chest pain.
Compared with no program, people who did exercise based rehab also probably lived longer. They reported better physical function, energy, social life and mental wellbeing. It reduced recurring cardiac events by 28% and hospital admissions (from any cause) by 35%.
Who cardiac rehab exercise is for
If your heart has been through something, or is working harder than it should, structured exercise belongs in your recovery. That includes people who have had or live with:
A heart attack (myocardial infarction). The most common reason people start cardiac rehab, and where the evidence is strongest.
Stents or angioplasty. The blockage is fixed, but the disease process that caused it still needs managing.
Bypass surgery or valve surgery. Rebuilding fitness and strength once your surgeon clears you, while the sternum heals.
Heart failure. Supervised exercise improves exercise capacity and quality of life, and is a standard part of stable heart failure care.
Atrial fibrillation and other arrhythmias. Training is adjusted around your rhythm, medications and symptoms.
High blood pressure, high cholesterol or type 2 diabetes. Exercise directly lowers blood pressure and improves blood sugar control, cutting your risk before an event ever happens.
The gap is real. Many eligible people never attend a rehab program, often because of work, travel or not being referred. That gap is where we come in.
What a cardiac exercise program looks like
Good cardiac rehab isn't a gentle stroll and a pamphlet. It's a training program, built and progressed like any other, with closer monitoring.
Aerobic training. Walking, cycling, rowing or swimming, most days of the week. Intensity starts conservative and builds over weeks. For the right people, interval training is part of the mix later on.
Resistance training. Two to three sessions a week. Stronger muscles mean less strain on the heart for everyday tasks like lifting, carrying and climbing stairs.
Monitored intensity. We use heart rate, blood pressure, perceived exertion and symptoms to keep each session in the right zone. If you're on beta blockers, heart rate alone can mislead, so we read the whole picture.
Gradual progression. Small, deliberate steps in duration first, then intensity. Fitness comes back faster than most people expect.
Confidence as an outcome. Learning what effort feels like, and what's normal, is as important as the fitness itself.
The goal isn't to keep you safe on the couch. It's to get you back to the life you want, whether that's playing with the grandkids, getting back on the bike or lining up for your next race.
Exercising safely with a heart condition
Appropriately prescribed exercise is safe for most people with heart disease. Getting cleared by your cardiologist or GP first, and knowing the warning signs, keeps it that way.
Stop exercising and rest if you notice:
Chest pain, pressure, tightness or heaviness Pain spreading to your arm, jaw, neck or back
Unusual shortness of breath that doesn't settle with rest
Dizziness, light-headedness or feeling faint
A racing, pounding or irregular heartbeat that feels different from normal
If symptoms are severe, get worse, or last more than 10 minutes, call 000. If you've been prescribed angina medication, follow the action plan your doctor gave you.
How an exercise physiologist in Darlinghurst can help
An Accredited Exercise Physiologist (AEP) is a university qualified allied health professional trained to prescribe exercise for people with chronic and complex conditions, including heart disease. It's the bridge between hospital-based rehab and getting back to full strength.
Here's what working with us looks like:
1. Assessment. We review your cardiac history, medications, test results and symptoms, then measure your current fitness and strength.
2. A program built for your heart. Exercise types, intensities and targets set around your condition and goals, not a generic handout.
3. Monitored sessions. Heart rate, blood pressure and symptoms are tracked as you train, so you learn what the right effort feels like.
4. Progression and re-testing. Fitness is re-measured every block, so you can see the change in black and white.
5. Working with your team. We liaise with your cardiologist and GP so your training and medical care pull in the same direction.
Our clinic is in Darlinghurst, an easy trip from Surry Hills, Paddington, Potts Point, Woolloomooloo and the Sydney CBD. If getting in is hard, we also run online sessions and mobile visits across Sydney.
Exercise after a cardiac event: FAQs
How soon can I exercise after a heart attack?
Gentle walking usually starts in hospital or soon after you get home. A structured program typically begins within a few weeks, once your cardiologist or GP clears you. The exact timing depends on your event and treatment.
Is it safe to lift weights with a heart condition?
For most people with stable heart disease, yes. Resistance training is a standard part of cardiac rehab. It's introduced at moderate loads with good breathing technique, then progressed. After open-heart surgery, upper-body lifting waits until your sternum has healed.
What heart rate should I train at?
It depends on your condition, your medications and your exercise test results. Beta blockers in particular change how your heart rate responds. Your exercise physiologist will set your zones and teach you to use perceived effort alongside them.
Can I get back to running, cycling or racing?
Many people do. With clearance from your cardiologist and a well-progressed program, returning to endurance sport is a realistic goal for lots of people.
This article is general information, not personal medical advice. Always get clearance from your cardiologist or GP before starting a new exercise program after a cardiac event or diagnosis.
Sources
Cochrane (September 2026), Cardiac rehabilitation cuts hospital admissions and heart attack risk
Dibben et al., Exercise-based cardiac rehabilitation for coronary heart disease, Cochrane Database of Systematic Reviews