Keep scrolling for 21 great high-intensity workout options to try that range from five to 45 minutes and include all different protocols. Note that since HIIT has such a broad definition we used ...

It’s all gas, little breaks for this killer five-minute HIIT workout ... these 5 exercises for 45 seconds of work, and 15 ...

For fitness enthusiasts who need a little cardio variety, HIIT (or high-intensity interval training) has long been a popular ...

Your boring workout is secretly sabotaging results try HIIT for faster fat loss muscle gains and nighttime metabolic burn.

Navaretta recommends the following HIIT workout, where you'll do each exercise for 30 seconds, with 15 seconds of rest in between. Each cycle will take just under four minutes, and you'll want to ...

To structure a HIIT workout ... make it a 45 second work period followed by 15 seconds rest. Repeat the circuit twice for the ultimate six-minute HIIT. Think you can keep going?

When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty Images If you hate running, the good news is it’s not the only way to burn ...