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.