Can a 4-minute workout really deliver better—and faster—results than HIIT? As HIIT's popularity soars, sprint interval training, or SIT, is doing its best to catch up.

Celebrity trainer and ex-marine Erin Oprea shares the 4 minute Tabata workout she recommends people do for a quick burst of intense exercise.

However you do it, what makes HIIT work is the intensity. You’re going hard—typically as hard as you can—for a short period ...

Another study led by the University of Macau found that participants who performed 20-minute HIIT workouts 4 days a week for 5 weeks improved their oxygen consumption by 9%.

The Norwegian 4x4 method is a type of cardio workout featuring four rounds of hard four-minute intervals. You’ll rest for ...

If you have no access to no home gym equipment, then this bodyweight HIIT workout is a great alternative and also includes plenty of exercises that'll increase strength and cardiovascular fitness.

If you’re looking to add some kick to your workout and save time while doing it, it’s probably time to try a 15-minute HIIT workout. “HIIT, or high-intensity interval training, essentially ...

If you're struggling to squeeze in your HIIT workout, this dance cardio class is for you. Host and choreographer Kaleila Jordan is here to guide you through a dance workout that will get your ...

In this 10-minute HIIT workout video, Tanner Courtad includes intervals of beginner's exercises with walking intervals.

The Women's Health+ 7-Day Ultimate HIIT Challenge will boost your metabolism and build strength. Access the full program schedule and workout videos here.