Beginner: Lie down in “side-plank” position with forearm on mat or SmithShaper (SS) pad and same leg on center of SS. Raise body off floor, keep contact with forearm, SS, and opposite leg. Contract your leg towards your chest and return to starting position. Repeat this for desired amount of reps and then change sides and repeat.
Intermediate: Repeat beginner movement with both feet on SS. Advanced: Repeat movement with hand down only.