Halle Berry's No-Equipment Ab Workout
Feel Strong and Sexy This Summer With Halle Berry's Equipment-Free, Ab-Shredding Workout
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Start standing with a towel in both hands and your arm fully extended overhead. With control, perform a reverse lunge by stepping your right leg behind you. Using your core, stand back up and drive your knee up to the side. Repeat with the left leg. Complete 10 to 20 reps.