1. Stand with feet together and hold a light medicine ball (4 -- 8 pounds) with both hands overhead.
2. Step forward with your left foot into a lunge, lower your arms (don't lock your elbows) in front of you at chest height, then twist your arms and torso to the left as you contract your right oblique muscles (squeeze your right glute as you turn). Twist back to center, step back to starting position and repeat with other leg. Do 10 reps on each leg.