In this 20-minute workout, trainer Brett Hoebel [1] will whip you into shape with just four moves. He's the creator of the 20-Minute Body [2] so he knows how to make the best use of your time. You might even recognize him as trainer from season 11 of The Biggest Loser. But after this workout, you will remember his as the trainer that made your legs quake.

Wardrobe Credit:
On Anna: Sweat With Soul top [3], Tantris tights [4], and Athletic Propulsion Labs (APL) shoes [5]
On Brett: Onzie men's outfit [6] and Reebok shoes [7]
On Rachel: Show Me Your Mumu outfit [8] and Athletic Propulsion Labs (APL) shoes [9]
Corkcicle water bottle [10]
Manduka mat [11]