This article is for informational purposes only and does not replace advice from a cardiologist or sports physician. If you have cardiovascular disease, high blood pressure, or other conditions, discuss your training plan with a doctor before starting or increasing exercise intensity.
Regular physical activity is one of the most effective non-pharmacological ways to support cardiovascular health. It improves heart function, lowers resting heart rate, and supports healthy blood pressure and lipid profiles. The key, however, is choosing training intensity and volume sensibly, matched to your current health status.
How training affects the heart
Regular aerobic exercise leads to an adaptation known as "athlete's heart" — the heart muscle becomes more efficient, stroke volume (the amount of blood pumped per beat) increases, and resting heart rate gradually drops. That's why well-trained endurance athletes often have a resting heart rate around 40-50 beats per minute, well below the average 60-80.
How much activity is recommended for heart health
Widely cited guidelines (including from the WHO) recommend for adults:
- 150-300 minutes of moderate-intensity aerobic activity a week, or
- 75-150 minutes of high-intensity activity a week, or an appropriate combination of both, plus
- Muscle-strengthening exercises at least twice a week, engaging the major muscle groups.
How to choose a safe intensity
Training in heart-rate zones matched to your goal and fitness level lets you avoid both too little stimulus and excessive strain. Approximate maximum heart rate is often estimated using the formula 220 minus age, though this is a simplification with a fair margin of individual error.
Example: a 45-year-old has an approximate maximum heart rate of 220 − 45 = 175 bpm. Moderate-intensity training (for heart health) should fall in a zone around 50-70% of that value, i.e. 88-123 bpm.
Warning signs during exercise
Chest pain or pressure, sudden shortness of breath disproportionate to the effort, dizziness, an irregular heartbeat, or fainting are signs that require immediately stopping activity and seeking urgent medical attention. They shouldn't be dismissed or "pushed through" during a workout.
When to get a heart check before increasing training intensity
People with risk factors (high blood pressure, high cholesterol, diabetes, smoking, obesity, family history of heart disease) or returning to activity after a long break should consider a cardiology consultation, especially before starting demanding forms of training such as HIIT or long-distance running.
Check your heart-rate zones for safe training: Maximum heart rate calculator →
Frequently asked questions about training and heart health
How much physical activity a week is recommended for heart health?
The general recommendation is 150-300 minutes of moderate-intensity activity or 75-150 minutes of high-intensity activity a week, supplemented with muscle-strengthening exercises at least twice a week.
Does a low resting heart rate always mean good fitness?
In people who train regularly, a low resting heart rate usually indicates good cardiovascular fitness. In untrained people, a very low heart rate may still warrant a medical check to rule out a heart rhythm disorder.
What symptoms during training should be a concern?
Chest pain or pressure, severe shortness of breath, dizziness, heart palpitations, or fainting are signs that call for immediately stopping the activity and seeking urgent medical attention.
Is strength training good for the heart, or only cardio?
Both types of training benefit heart health. Cardio improves aerobic capacity, while strength training supports body composition, insulin sensitivity, and lipid profile, which indirectly benefits the cardiovascular system.
Is the 220 minus age formula accurate?
It's a simplified estimate with a fair margin of individual error (as much as several beats per minute). A more accurate estimate of maximum heart rate requires an exercise stress test under specialist supervision.
Can people with high blood pressure train intensely?
It depends on how well the blood pressure is controlled and overall health status. The decision on training intensity is best made together with your doctor, especially when planning high-intensity workouts.
Is it worth getting an ECG before starting intense training?
People with risk factors for heart disease, or who have been inactive for a long time, are advised to get a medical consultation, which may include an ECG or exercise stress test, especially before starting demanding forms of training.
Does regular training lower blood pressure?
Yes, regular aerobic activity is one of the recognized non-pharmacological ways to support healthy blood pressure, though the effect depends on consistency and overall lifestyle.
Is fasted training safe for the heart?
For most healthy people, moderate fasted training is safe, but with cardiovascular disease or diabetes, it's worth discussing this practice with a doctor due to the risk of hypoglycemia or other complications.
How quickly does heart fitness improve after starting training?
Initial adaptations, such as a lower resting heart rate, can appear within a few weeks of regular aerobic training, though full effects typically develop over several months.