High-intensity interval training is one of the best ways to pack a lot of exercise into a short period of time. HIIT workouts are so efficient because they alternate short bursts of very intense ...

In TODAY.com's Expert Tip of the Day, a trainer explains how incorporating HIIT into a weekly workout routine can boost one's ...

If you are looking for a way to change up your routine, opt for these HIIT workouts that you can do at-home without equipment. Everyone from sports medicine docs, to fitness buffs to cardiologists are ...

If you don't have a ton of time to exercise and want to make the most of the few minutes you're able to squeeze in, HIIT workouts are for you. There are minimal rests during HIIT workouts, and even ...

Finish the Women's Health+ Ultimate HIIT Challenge strong with this 20-minute upper body bodyweight workout. Today's program uses fast-paced lateral exercises to strengthen and your arms, core, and ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." High-intensity interval training (otherwise known as HIIT) may sound, well, intense. And it can be. But ...

When I'm planning my fitness routine, my goal is not to spend as much time as possible sweating. It's exactly the opposite. I want to be ultra-efficient in the gym or my living room and get on with my ...