FitSugarTV: Facebook: Twitter: Famous for helping Heidi Klum bounce back post baby, David Kirsch also helps keep the backsides of the Victoria's Secret Angels in check. Since he authored the unambiguously titled Butt Book, we asked David to share his favorite booty-toning moves with us. Check out this video to learn three exercises that will tone your derriere without overworking your quads.
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