Earlier this year, Jennie Garth had forgotten about her body. To see her now, though, you wouldn't have any idea -- she's holding her own on the new 90210 against all those hot young stars! So how'd she get her body in such great shape? By mixing it up!

She's been working out with her husband, Peter Facinelli, using her trainer, Tony Horton's P90X DVDs, and she says, "Every day is different. One day is really hard yoga. Then arms and shoulders, legs, then karate. His program is made to confuse the muscles so you don't plateau. I feel better now than I ever have."

Not only does it sound like this routine keeps her muscles working, but it probably keeps the workouts fresh and fun, too! The training system she's referring to is available here for $119.95 -- sounds like quite a bit for a video, for me, but it's really a whole program including workouts and nutrition information.