Heart failure and physical activity:
walking, exercising, and when to stop

Article written and reviewed by Dr Luca Moretti

Having heart failure does not mean that you must avoid physical activity. On the contrary, in clinically stable people a regular, individualized exercise program is part of treatment: it improves the ability to carry out everyday activities, reduces the sense of limitation, and may lower the risk of hospitalization.
The 2026 ESC guidelines recommend individualized exercise for all stable patients with heart failure, unless there are specific contraindications. However, the amount and intensity should not be copied from generic programs: they depend on symptoms, fitness level, age, ejection fraction, heart rhythm, blood pressure, comorbidities, and treatments.

In practical terms, physical activity should be:

• started when heart failure is stable and treatment has been established;
• progressive, avoiding abrupt increases in intensity or duration;
• adapted to individual capacity and symptoms;
• based mainly on aerobic activity, with strength exercises when appropriate;
• preceded and followed by a lighter warm-up and cool-down phase;
• stopped if unusual symptoms or symptoms much more severe than usual occur.

In patients who are more limited, frail, recently hospitalized, or unsure about how to begin, cardiac rehabilitation provides a particularly useful setting because it allows assessment, exercise prescription, monitoring, and controlled progression.

Why being active is beneficial even when the heart is weakened

Heart failure reduces exercise tolerance not only because the heart may pump less effectively. Over time, deconditioning, loss of muscle strength, abnormalities of the peripheral circulation, and reduced efficiency with which the muscles and respiratory system use oxygen also contribute.
Prolonged inactivity can therefore create a vicious cycle: the less a person moves, the more tiring even small efforts become, and the greater the tendency to avoid activity further.

Regular exercise counteracts this process. Clinical trials and meta-analyses have shown improvements in functional capacity and quality of life both in heart failure with reduced ejection fraction and in heart failure with preserved ejection fraction. The 2026 ESC guidelines also indicate a reduction in overall hospitalizations with individualized programs in stable patients.

How to start: walking and increasing gradually

For many people, walking is the simplest starting point. Equipment is not necessarily required, and intensity can be adjusted by slowing down, shortening the route, or taking breaks. Someone who is very deconditioned can start with short periods spread throughout the day and increase them gradually, rather than trying to complete a long session immediately.
The right speed is not the same for everyone. Exercise that causes mild or moderate breathlessness but remains manageable may be appropriate in many stable people; severe, sudden, or disproportionate breathlessness should not be regarded as a training goal.

The target heart rate cannot be defined using one simple formula that is valid for everyone, especially because beta-blockers, atrial fibrillation, pacemakers, and other conditions alter the pulse response to exercise. In structured programs, intensity and progression are prescribed according to the FITT model, meaning frequency, intensity, time, and type of exercise.
When available, an exercise test or cardiopulmonary exercise test can help define individual capacity and appropriate intensities more precisely.

Aerobic exercise, strength training, and cardiac rehabilitation

Walking, stationary cycling, cycling, and other rhythmic activities involving large muscle groups are common forms of aerobic exercise. These can be combined with strength exercises using light or moderate loads, which are particularly useful for counteracting muscle weakness and loss of independence.
The choice also depends on balance, joint problems, neuropathies, respiratory diseases, and fall risk. In frail patients, gradually improving strength and safety of movement is often more useful than pursuing a standardized target of minutes or kilometers.

Cardiac rehabilitation is not simply supervised gym exercise. It includes clinical assessment, education, optimization of therapy, management of risk factors, nutritional and psychological support, and individualized exercise prescription. The 2026 ESC guidelines recommend rehabilitation in patients with HFrEF and HFpEF to improve physical function and quality of life; it can also be started after a decompensation once the patient is sufficiently stabilized.

When it is better not to exercise

Structured exercise should not be started or intensified during a phase of decompensated heart failure. If breathlessness, edema, or weight have increased over the previous few days, if new orthopnea has appeared, or if walking ability has clearly worsened, it is more important first to determine whether there is an exacerbation. The signs to monitor are described in the guide to worsening heart failure.
Other temporary contraindications include unstable cardiovascular conditions, such as uncontrolled angina, high-risk arrhythmias, and active thromboembolism, as well as non-cardiac problems such as acute infection, uncontrolled diabetes, or an exacerbation of respiratory disease.

Extreme heat or cold can also increase physiological stress. On very hot days, outdoor exercise can promote dehydration and hypotension, especially in people taking diuretics or vasodilators. It is preferable to modify the time, location, and intensity rather than trying to adhere rigidly to the planned program.

When to stop during physical activity

A certain increase in breathing rate and heart rate is normal during exercise. However, you should stop if you develop chest pain or pressure, breathlessness that is much more severe than usual, dizziness, a feeling of faintness, sudden weakness, sustained or irregular palpitations associated with feeling unwell, or any new symptom that makes the activity feel unsafe.
If the symptoms resolve quickly with rest but are new or recurrent, they should be reported to the doctor before resuming the same level of training.

Severe breathing difficulty, persistent chest pain, fainting, or altered consciousness instead require urgent assessment and may make it necessary to call 112 or 118. The goal of exercise in heart failure is to improve capacity and independence, not to "push through" potentially dangerous symptoms.

Frequently asked questions about heart failure and physical activity

Can you walk if you have heart failure?
Yes. In most stable patients, walking is one of the simplest activities that can be used to gradually increase physical capacity. Intensity and duration should be adapted to symptoms, clinical condition, and the advice received.

Can physical activity put too much strain on the heart?
In stable heart failure, individualized exercise is recommended because it improves functional capacity and quality of life and reduces the risk of hospitalization. The problem is not exercise itself, but exercising during an unstable phase or at an unsuitable intensity.

What is the best physical activity for heart failure?
There is no single best exercise for everyone. Walking, stationary cycling, and other aerobic activities are commonly used; strength exercises and, when indicated, respiratory muscle training can be added in rehabilitation programs.

When should you stop during exercise?
You should stop the activity if you develop chest pain, breathlessness that is much more severe than expected, dizziness or a feeling of faintness, significant palpitations, sudden weakness, or other new and important symptoms.

When should you not start exercising?
Exercise should not be started during decompensated heart failure or in the presence of unstable conditions such as uncontrolled angina, high-risk arrhythmias, acute infection, or other clinical situations that require stabilization first.