Step by step instructions
Begin in a full side plank with left foot on top of step, right foot pointed, with toes lightly tapped on the floor in front of step. Extend top arm to ceiling above shoulder, bottom arm positioned directly under shoulder for support.
Tighten abs and lift bottom leg up, crossing the midline of body, rotating heel slightly up to ceiling. Hold for 1 count, then lower to return to the starting position. Complete all reps on the first side, then switch legs and repeat to complete the set.