If you swap some of your sitting time for activities like brisk walking or jogging, you might give your heart a bigger boost—especially if you're already at higher risk for heart problems.

If you're at high risk for heart problems, doing more than an hour of intense exercise a week might not help your heart as much as doing less — it could even be less beneficial.

If you're at very high risk for heart problems, doing just 42 minutes of intense exercise a week seems to give you the best heart health boost — doing more might not help as much and could even reduce the benefits.

If you exercise hard for more than 42 minutes every day, you’re less likely to have heart problems later on.

People who move more—especially those who do brisk walking, running, or other intense activities—tend to have fewer heart problems, and this benefit is even stronger for people who are already at high risk for heart disease.

Sitting or being inactive for long periods every day makes people more likely to die early—from heart disease or any other cause.