Kick your endorphins into gear with Kelly's weighted upper-body workout that will get your heartrate up with strength-training circuits. All you need (if you have - if not, these can also be done with just bodyweight!) is a fabric band, a pair of medium dumbbells and a single heavy dumbbell.

Kelly's Outfit*: Ultra Cropped Long Sleeve Black & Original Leggings Esperança "Hope"

Liz's Outfit*: Chrome Tank Açaí & Chrome Leggings Açaí