Lack of regular physical exercise is recognized by the American Heart Association as one of the key heart disease risk factors, and it is assumed that cardio exercise (walking, jogging, swimming, etc.

Here’s what to know about the health benefits of both forms of exercise. Ask Well Here’s what to know about the health benefits of both forms of exercise. Credit...Eric Helgas for The New York Times ...

HIIT, or high-intensity interval training, can be an efficient, fun way to tackle your cardio workouts, add muscle, and shred serious fat.

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. So where should you ...