I'm an exercise addict who does it all -- hiking, running, spinning, dancing, aerobics and Tae Bo. I run the Santa Monica stairs and jog the UCLA perimeter. I'm hooked on Pilates DVDs, "Buns of Steel" tapes and hit the gym three or four times a week. But this September I hit a wall. I no longer found my workouts challenging or effective. I wanted to do more than lose five pounds. I wanted to sculpt my abs, firm my figure and mold my Jew.Lo tush. So I settled down and started seeing a personal trainer.