Trainer Heather Robertson shared a 35-minute HIIT workout meant to burn calories and fat. It requires zero equipment!

This 35-minute workout from Heather Robertson is the first in her 6-week low-impact HIIT workout program. There's no jumping but still high intensity.

So, if that sounds like your kind of workout, roll out one of the best yoga mats and prepare to get sweaty. We’ve found a 15-minute full-body HIIT workout that’s designed to raise your heart ...