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Check out Women's Health's FitGIF Friday every week for fun and challenging new moves to make your sweat sesh really count. Here's this week's exercise:
Underhand bent-over row: Any row can give you a great upper-body workout, but this variation is all about the biceps. The reverse grip isolates your biceps, strengthening them more than a neutral or overhand grip can. Plus, you'll feel your shoulders become more sculpted with each rep.