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Shrink your silhouette fast by giving some TLC to the muscles you don't see in the mirror. "These moves not only tone your back but also lift your posture so you appear taller and thinner," says celebrity trainer Tracy Anderson, the creator of the new Precision Toning and Dance + Cardio DVDs. Anderson shares (and demos) her top picks for back and booty sculptors on the next page, so you can get the same workout as her hard-bodied clients like J.Lo and Gwyneth Paltrow. Use a set of three-pound weights to do two nonstop circuits in 15 minutes flat.