Your Trainer: Heidi Kristoffer, creator of CrossFlowX, developed this series of poses exclusively for SELF.You'll Need: A yoga mat. Do 2 sets of the moves 3 times a week on alternate days.Tank, Fox, $40
A hot new workout class combines the toning benefits of yoga with the fat-burning power of cardio. CrossFlowX, offered at The Movement in New York City, pairs strengthening poses with heart-pumping moves for a routine that sculpts muscle from head to toe. Now you can try it at home.