Do your arms feel like they are sagging? There is no better time to shape them up. According to one expert, you can strengthen your arm muscles in just two weeks. Risa Sheppard, Master Pilates trainer, creator of The Sheppard Method, offers up five effective exercises to firm up flabby arms in 14 days. Sheppard explains that these exercises can be done with or without weights. “If you choose to do weights, use only 2 or 3 pounds,” she says. Hug a Tree Lie on your back with your knees b...