The 12-week butt-lifting, fat-shredding plan is based on protocols from a study conducted by UCLA and Equinox that evaluated the Equinox personaltraining method for increasing lean body mass. It’s divided into three four-week phases; each phase includes three one-hour resistance-training workouts a week, which vary in intensity and weight. The first phase focuses on correcting errors in basic movements (e.g., leaning too far forward during squats). The second phase consists of complex and technical exercises, such as wide-legged “sumo” dead lifts. The final phase features powerful movements—from box jumps to kettlebell swings—aimed at lifting the backside and strengthening the entire body.