Sprint interval training, or SIT, is super trendy right now. It’s a great way to improve your running speed and to get in a hard interval workout, and I’ll explain exactly how. But I also need to ...

HIIT, or high-intensity interval training, is increasingly popular, and it provides plenty of benefits, from torching calories to increasing your VO2 max and overall athletic performance. SIT, or ...

Interval running condenses the powerful effects of regular running into shorter, high-intensity bursts. Research shows it can ...

Typically, in sprint interval training, you’ll run for a set amount of time and then rest, progressing your effort to getting faster and faster each interval. Or you might do something called a ...

Losing weight and gaining muscle are two major feats in and of themselves, but if your goal is to achieve both at the same time, you’re likely working toward body recomposition. Strength training and ...

Ease yourself into better shape with this modified routine by exercise physiologist Chris Jordan, creator of the original 7-minute workout. Warning: This graphic ...

Influencers call sprinting the ultimate fat-burning workout. Experts say it’s more nuanced—but research shows this high-intensity exercise offers surprising benefits for the heart, muscles, and even ...

Les Mills Sprint applies HIIT principles to spinning for days when you're riding solo. Try this simple 15-minute workout you can do at the gym. High Intensity Interval Training (HIIT) has been ...