If you’re after a cut-out gown, shape up your back.
AT HOME: Work your back with a reverse push-up, a.k.a. tricep dips. Sitting on the floor in front of a chair, place your hands on the seat (your elbows should be bent.) Straighten your arms, using your back and triceps to pull your body upward, then slowly lower yourself back down. Do three sets of 10 reps.
AT WORK: When you’re standing, keep your arms down at your sides. Then squeeze your shoulder blades together. “Imagine you’re holding a piece of paper between your arms and your ribs,” explains Halfpapp. “This opens up the chest and contracts the muscles in the back.”
AT PLAY: All racquet sports work the back, but a new trend among the fit and famous (like Cindy Crawford and Rihanna) is stand-up paddle boarding. While paddling along the shore—on a surfboard—you work not only your back, but also your arms and shoulders.
Lisa Hannam is Glow's Health Editor.