Updated May 07, 2008

Frequency: 2 to 3 times per week
Repetitions: 8 to 12
Trainer tip: If you feel unsteady, begin by working one leg at a time.

A. Lie facedown on a stability ball with your arms bent slightly, abs tight, and legs straight.

B. Using your abs to stabilize you, slowly lift both legs toward the ceiling; pause for three to five breaths, then lower your legs to the floor. Do eight to 12 reps.

Six-month boost
Instead of lowering legs to the floor, stop one or two inches above it; begin from that position for the rest of the set.

Nine-month boost
As you raise your legs, lift and extend your right arm off the floor; alternate with left arm for remaining reps.

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