But are HIIT and other similar forms of intense, vigorous exercise safe as you age and get older?
Experts suggest those in their 50s and even 60s who have no underlying health issues and who already have a good level of fitness should be able to take part in vigorous training without any problems.
If you keep moving, it can also help reduce pain and your risk of mental illness.
Physical activity is anything that gets you moving - whether that's walking, doing the gardening, playing with your grandchildren or taking part in a fun run for charity.
The current official recommendation is to do 150 minutes of moderate activity every week - such as: High-intensity interval training (HIIT) is a form of exercise that has become particularly popular in recent years.