Just two-and-a-half hours of moderate exercise a week can reduce the risk of heart disease, researchers say.
While more exercise is better, 150 minutes a week can lower the risk of heart disease by 14pc compared to people who are inactive.
Experts in the US examined data from 33 studies of physical activity and heart disease, including nine which looked at how much people exercise were actually doing.
The study found a 14pc reduced risk for those doing moderate exercise for 150 minutes a week, and a 20pc reduced risk for those exercising for 300 minutes a week.
Moderate activity includes very brisk walking, heavy cleaning such as washing windows, vacuuming and mopping; mowing the lawn, cycling and badminton.
Jacob Sattelmair, from the Harvard School of Public Health, said: "Early studies broke people into groups such as active and sedentary.
"More recent studies have begun to assess the actual amount of physical activity people are getting and how that relates to their risk of heart disease."
Amy Thompson of the British Heart Foundation, said: "There are plenty of ways you can build exercise into your daily routine.
"Why not leave the car at home and take a brisk walk to the shops, mow the lawn or take the family cycling at the weekend?"