Seismic splurge alert! Leading the trend in whole-body vibrations, the new Power Plate has celebs like Madonna and Elle McPherson all abuzz. Designed for strength training, stretching and massage, the Plate claims to trigger muscle contractions for improved strength, bone density, circulation and posture. You can squat, plank, stretch out and even get a back massage! Not ready to cough up $4,500? Many gyms rent it out by the hour. "It's great for core strength and stability," says Leslie. "Do NOT stand up straight on the Plate though —it will rattle all the way up through your teeth."