"""One sexy thing about Michelle Obama's arms are her strong shoulders,"" says Equinox personal trainer Lacey Stone. ""If you develop your shoulder, with dumbbell front raises, it actually makes your whole arm look fitter.""  TO DO: Stand with feet about hip-width apart, holding a three- to five-pound dumbbell in each hand, elbows bent, weights to sides at shoulder level, palms facing forward. Slowly press weights up over your head, meeting them in the middle, then lower. Do three sets of 15 reps."
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