Plank Medicine Ball Pass

Both of you hold a high plank, facing each other a short distance apart, and slide or hand a light ball back and forth. Every pass means one hand comes off the floor, so the plank turns into an anti-rotation drill: the job is to keep the hips from swiveling. A 6 to 8 pound ball is enough, and rolling it rather than lifting it makes the move kinder for a beginner. A partner who finds the full plank too hard can hold it from the knees and still trade passes, so the pair stays in time. Work for 30 to 60 seconds, rest a minute, and repeat.