I had heard rumblings about a new exercise hybrid — Pilates + boxing = Piloxing — and wanted to give it a try when Hilary Duff tweeted that it kicked her butt. Piloxing (4129 Cahuenga Blvd., Toluca Lake, 818-762-8855) has many fabulous trainers, but I decided to take a class with founder Viveca Jensen, who teaches three times a week. Seeing her move and teach with such passion makes you want to get down, too. Model Mini Anden, who was in the class with me, agrees: "Viveca's energy is inspiring! She makes working out a good time and keeps challenging you to take it to the next level. Piloxing keeps me healthy and in great spirits." Click through for more details and action shots, then if you think it's a wee bit too crazy for you, try the new lower-energy version, Piloxing Lite.