When done right, this targeted tush-and-thigh tightener is much tougher than it looks!
How to do it: From a kneeling position, bend both elbows down to the floor below your shoulders, hands clasped (press both arms down into the floor and draw your abs in tight so that lower back doesn't sag). Extend your left leg straight out from your hip, toe pointed. Imagine tracing a triangle with your toes, lowering left leg down and to the left (touching the bottom left corner of the triangle), lift back up to center (top of triangle), and then lower down and to the right (touching the bottom right corner), then back to center. That's one rep. Repeat 10 times then switch legs. Try up to 3 sets of 10 reps on each leg.