Exercise, AFib & learning to adapt
Latest update: September 2026
Exercise had always been part of my life. After stroke I had to learn to trust it again — and when AFib and atrial flutter later entered the picture, I had to rethink what progress looked like once more.
The biggest surprise was that my fitness did not simply disappear. Some forms of cardio became unpredictable, while strength and resistance training could still feel remarkably normal.
I did not want a heart-rhythm diagnosis to automatically mean “stop exercising”
After my stroke, returning to exercise had already involved rebuilding confidence. I had worried about whether harder exercise could somehow trigger another stroke and eventually underwent monitored exercise testing before I felt comfortable pushing myself again.
Later, AFib and atrial flutter introduced a different problem. I was not simply afraid of exercise — I was trying to understand why the same body could feel strong during one type of training and unexpectedly limited during another.
It is not an exercise prescription for somebody else with AFib, flutter or a history of stroke.
Cardio became unpredictable before strength did
That contrast became one of the most confusing parts of the whole experience.
Cardio tolerance varied
Running, hills and sustained cardiovascular work could sometimes feel disproportionately hard compared with what I expected from my overall fitness.
Strength often remained
I could still complete substantial resistance sessions even on occasions when sustained cardio felt poor.
That was difficult to interpret
I initially saw those difficult cardio sessions as evidence that my whole physical condition might be deteriorating.
A bad cardio session did not mean all my fitness had vanished
This became one of the most useful things for me to recognise.
I could struggle with a sustained cardiovascular effort and still perform demanding resistance work. That did not tell me why the cardio felt difficult, but it challenged the idea that I was experiencing a simple, rapid decline in every aspect of fitness.
It also changed the way I judged an individual session. One poor run or treadmill session no longer automatically meant that everything was getting worse.
“Fitness is not one single ability. My cardio and strength could tell very different stories on the same day.”
The Holter and echo changed how I interpreted what I was feeling
More recently, increased heartbeat awareness, tiredness and unpredictable cardio tolerance made me worry that AF had become permanent and that I was facing rapid physical decline.
A 24-hour Holter subsequently gave a more specific picture: the interpretation I was given was that atrial flutter appears to be the dominant rhythm, with AFib occurring in the background.
My echocardiogram was also reassuring.
They showed me that the explanation was more nuanced than the future I had already predicted for myself.
I am still waiting for the written cardiology report, so I am deliberately not publishing a precise flutter classification, personal ablation success rate or technical claims about how my PFO closure device affects treatment.
I changed the mix rather than abandoning exercise
My response was not to keep forcing the type of exercise that felt least predictable simply because it used to be part of my routine.
I gradually placed more emphasis on strength and functional training, walking and forms of cardiovascular work that I could manage more consistently.
I still value cardio. I simply stopped treating running performance as the only meaningful measure of whether I was fit.
The way I now think about training
These are principles I use for myself, not rules for another stroke survivor or somebody with an arrhythmia.
Consistency beats proving a point
I would rather train regularly than turn every cardio session into a test of whether I can still perform like I used to.
Strength still counts
Resistance training, functional strength and maintaining capability are meaningful parts of fitness for me.
How I feel matters
If a session feels distinctly wrong, I do not need a watch number to prove that I should reduce the intensity or stop.
One session is not a trend
A difficult workout can be useful information without becoming a prediction about the rest of my life.
Medical evidence matters
ECGs, longer rhythm monitoring and cardiology assessment tell me things that sensations and fitness trackers cannot.
Adaptation is still progress
Changing how I train does not mean giving up. It means finding a way to remain active within the reality I have now.
I stopped treating every heart-rate number as a verdict
Wearables can be useful for spotting patterns, recording workouts and providing information to discuss with a clinician.
But an irregular rhythm can make heart-rate readings harder to interpret, and a watch cannot replace a diagnostic ECG or ambulatory monitor.
For me, perceived effort, symptoms and the wider clinical picture became more useful than repeatedly checking whether a single number looked “right”.
General guidance is broader than a watch number
The British Heart Foundation advises people with AF to pay attention to how exercise feels because an irregular pulse can make heart-rate-based intensity less reliable.
If exercise brings significant breathlessness, chest discomfort, dizziness or you feel unwell, reduce or stop and seek appropriate advice.
I stopped measuring recovery only by whether I could run hard
There was a time when a poor run felt like evidence that I was losing fitness.
Now I think more broadly: strength, walking, mobility, work capacity, energy, confidence and the ability to live an active life all matter.
That shift has probably made my training more sustainable, regardless of what eventually happens with the rhythm treatment.
My experience sits alongside — not above — clinical guidance
The NHS says that most people with atrial fibrillation should be able to continue with normal activities including exercise, while avoiding exercise that is too intense and avoiding exercise when AF symptoms are present. It also advises checking with a doctor when somebody is unsure what exercise is appropriate.
The British Heart Foundation similarly advises building exercise gradually, warming up and cooling down, and seeking individual advice if AF is making someone feel unwell.
Stroke effects, arrhythmia type, symptoms, medications, cardiovascular health and other conditions can all change the advice.
There is a difference between normal effort and concerning symptoms
Exercise naturally raises breathing rate and makes muscles work harder. But significant chest pain, fainting, severe dizziness, severe or unusual breathlessness, or new neurological symptoms are not things I would treat as a challenge to push through.
Someone experiencing potentially serious symptoms needs appropriate medical assessment rather than an exercise workaround.
Urgent symptoms
Call 999 for suspected stroke symptoms, severe chest pain, collapse or another medical emergency.
For non-emergency new or worsening exercise symptoms, seek advice from an appropriate healthcare professional.
Continue exploring exercise and life after stroke
AFib and Stroke
Understand why atrial fibrillation matters after stroke and how it differs from atrial flutter.
Explore AFib and stroke →Gym After Stroke
Explore practical considerations around returning to gym-based exercise after stroke.
Explore the gym →Strength Training After Stroke
Explore resistance training, progression and appropriate safety considerations.
Explore strength training →Mental & Emotional Recovery
Explore fear, uncertainty, confidence and the mental side of long-term recovery.
Explore emotional recovery →Long-Term Stroke Recovery
Recovery can continue to evolve months and years after the initial event.
Explore long-term recovery →When AFib / Flutter Entered the Story
Read the previous chapter covering monitoring, Holter results and the latest treatment direction.
Read the previous chapter →Exercise, AFib and my experience — FAQs
Did AFib and flutter make me stop exercising?
No. They changed how some forms of exercise felt and led me to adapt the balance of my training. I continued strength work, walking and more controlled cardiovascular exercise.
Why could I lift weights when cardio sometimes felt poor?
That was simply how my own exercise tolerance presented. Resistance training and sustained cardiovascular exercise place different demands on the body. My experience should not be used to diagnose why another person's exercise capacity varies.
Did one bad cardio session mean my heart was deteriorating?
In my case, no. I worried that it did, but subsequent Holter monitoring and a reassuring echocardiogram gave my cardiologist a more nuanced picture. New or worsening symptoms should still be assessed appropriately.
Can someone exercise with atrial fibrillation?
Many people with AF can exercise, but suitability and intensity depend on symptoms, treatment, rate control, other health conditions and individual medical advice. NHS and BHF guidance both advise seeking professional advice where somebody is unsure.
Should heart rate be the main guide when exercising with AF?
Not necessarily. The British Heart Foundation notes that an irregular pulse can make heart-rate readings less useful for judging intensity, so how the exercise feels is also important. Individual clinical advice still matters.
Am I training for an upcoming flutter ablation?
My cardiologist has recommended flutter ablation as the next treatment direction, but I am waiting for the written clinical details before publishing technical claims about the precise procedure or rhythm classification.
This is my training story, not a cardiac rehabilitation programme
Stroke survivors and people with AFib or atrial flutter can have very different levels of mobility, cardiovascular health, medication use, symptoms and exercise experience.
Do not use my weights, exercise choices or training frequency as a target. If you are uncertain about exercise after stroke or with a heart-rhythm condition, seek advice from your stroke team, GP, cardiologist, cardiac rehabilitation team or another appropriately qualified professional.
Trusted further information
British Heart Foundation – How to exercise when you have atrial fibrillation
This page describes Neil's personal experience of exercise after stroke while living with atrial fibrillation and atrial flutter. It does not provide diagnosis, cardiac rehabilitation or individual exercise prescription.
About this page: Written from lived experience by Neil — Founder of Stroke Health Fitness. Neil is a qualified personal trainer but is not a doctor, cardiologist, physiotherapist or cardiac rehabilitation clinician. Latest update: September 2026.
Adaptation did not mean giving up
My training today is different from the way I once imagined it would be. But I am still training, still learning and still finding ways to stay strong and active while the medical side of the story continues.