STARTER DRILL: From a standing position, step rearward with your right foot (like a reverse lunge but slightly more extended) and place your right hand on the foor by the inside of your left foot. In one motion, stand tall, bringing your right knee up in front. (For an extra challenge/fat burn, add a small hop at the top of the motion to get slightly airborne.) Return to the bottom position and repeat. Tip: As your back knee drives upward toward the front, swing your opposite hand up with it, as if you were sprinting.