Begin in a full plank position with a dumbbell on the floor a few inches away from the outside of right hand. Engage abs to keep torso steady and reach left arm under right to grab dumbbell. Pull the dumbbell across the floor to the left side of body, releasing it just outside of left arm, and then return to plank. That's one rep. Do 20 reps, alternating sides each time.
プログラムを探す
