While a drastic weight loss or weight gain is bound to draw attention, Kelly Osbourne has been receiving non-stop praise for her healthy lifestyle maintenance. In addition to circuit training with celeb trainer Harley Pasternak, the key to Osbourne's prolonged fitness success has been regular classes at the uber trendy Bar Method. The body-sculpting workout is an intense ballet-Pilates hybrid that includes reverse triceps pushups, lunges, and ab work. Osbourne has been going three times a week to the 60-minute class since 2010, and it's clearly paid off. With a smaller waist and muscular legs, Osbourne is in the best shape of her life. Try out the Bar Method either at one of their locations or by snagging one of their workout DVDs in time to kick off the New Year right.