Her workout: Power Pilates, a series of exercises — performed on a mat or special apparatus — that stretches and strengthens the abdominals, back, butt, arms, and legs without adding extra bulk.
Check out: Power Pilates Foundation Workout, a 35-minute video of basic movements and mat-based exercises (including the famous "Hundred," a modified sit-up that's surprisingly tough). A chiropractor weighs in on how to adapt the exercises to accommodate past injuries or your body's own limitations. For a longer, leaner body, follow the routine three times a week.
Get it: powerpilates.com ($21)