Blake Lively

All those hours in stilettos may help this Gossip Girl star carve her calves, but to get her gams ready for Green Lantern, she also worked with L.A. trainer Bobby Strom five days a week. "We did a lot of single-leg strength moves, as well as plyometrics (powerful jumping exercises)," says Bobby. "That kept her heart rate elevated to amp up her calorie burn and challenged her balance to help strengthen her core."

The Blake Lively Workout:

Do 2 or 3 sets of each legs exercise three times a week.

You'll need: A 9- to 12-pound Body Bar and a stability ball. Find gear at

Overhead Squat

Overhead Squat

Works: Legs, butt, and shoulders

A. Hold a Body Bar overhead, hands shoulder-width apart and palms facing away from you, and stand with feet slightly wider than shoulders.

B. Keeping bar raised, squat until thighs are parallel to the ground. Rise up and repeat. Do 12 to 15 reps.

Side Wall Slide

Side Wall Slide

Works: Legs, butt, and core

A. Place a stability ball against a wall and lean left side against it, feet together and weight on right leg. Raise left arm to chest height in front of you, palm facing ground, and place right hand on hip.

B. Step left foot at a diagonal behind you as you bend right knee. Press against ball as you return to starting position; repeat. Do 12 to 15 reps; switch sides to complete set.