The Centers for Disease Control and Prevention (CDC) recommend that adults aged 65 and over engage in 150 minutes of moderate-intensity aerobic physical activity every week.
This should be in bouts of at least 10 minutes, they say.
Aerobic activity refers to any kind of exercise that improves the heart and the lungs. Some examples include brisk walking, running, swimming, and cycling.
In addition to the 150 minutes, the CDC also advise seniors to engage in muscle-strengthening activities on at least 2 days per week.
If moderate activity takes up too much time, these recommendations can be tweaked into vigorous-intensity equivalents, as detailed on the CDC website.