Finish the Women's Health+ Ultimate HIIT Challenge strong with this 20-minute upper body bodyweight workout. Today's program ... Then, perform the second exercise for 45 seconds.

Here's a quick rundown of this 15-minute HIIT ab workout. Perform three rounds with working intervals of 45 seconds and rest ...

But, we wouldn’t judge if they were enough to put you off a HIIT workout ... and it's going to take you 30 minutes to complete. There's no repeats in this workout, once you've done the exercise ...