Mix-and-Match Boot-Camp Workout
Upper body: Ball push-ups
Get into "up" part of push-up, with hands a bit wider than shoulders and feet a bit wider than hands. Rest left hand on sturdy ball, with elbows above wrists. (Drop knees to floor, if needed.) Engage abs, and bend elbows to lower chest toward floor; press into floor and ball to raise back up. Do all reps on one side, then switch sides and repeat.