"Sebastien Lagree has a little bit of a cult following in the fitness world–after an early career as a personal trainer, he first became famous for inventing the Megaformer and Proformer, which are used in his licensed fitness studios all over the country. In his West Hollywood studio, you can train with Sebastien himself on his newest invention, the Supra–a futuristic-looking machine that rotates and tilts under the trainer's control, as you work your way through a series of moves that range from squats to lunges to pushups. The workout is only 25 minutes, but it's insanely hard–you burn up to 600 calories per session, and are guaranteed to be sore afterwards."