Reps: 20, alternating sides
- Start in a wide stance with your toes pointed out; bring your hands behind your head with your elbows wide.
- Bend your knees over your toes, coming into a squat with your thighs almost parallel to the floor.
- As you straighten your knees to stand, lift your right knee while bending to the right to bring your right elbow and knee together, doing a side crunch.
- Straighten your spine as you bring your right foot to the floor, and bend both knees, coming into a sumo squat. This completes one rep.
This move will also get your heart rate up; it offers many of the muscular strengthening benefits of jumping but is a joint-friendly, low-impact exercise.