Feel like gravity has done a number on your butt? This Sexy Butt Workout will tone your glutes and tighten a saggy or flabby rear in just four weeks. Do these targeted butt-lifting exercises 3 times a week on every other day to give you a perkier derriere and sleeker thighs.

One-Legged Squat

Steps:

1. Standing behind chair, slightly to left, place right hand on the chair back and rest left hand on left hip. Keeping posture upright, raise left knee to thigh height, knee pointing forward, keeping left foot near right knee.

2. Keeping left knee lifted, bend right knee and sit back into a squat, holding for 2 counts. Contract buttocks as you straighten right knee and return to starting position. Do 10 reps then switch sides.

Lunge and Lift

Steps:

1. Stand 3 feet (1 meter) from stair with a dumbbell in each hand. Lift left foot onto stair, so right heel lifts off floor. Bend both knees and lower into a lunge, left knee directly over ankle, and right knee above the floor.

2. Shift weight to left leg, push off right foot to stand, then swing foot forward to tap it on stair. Step right leg back and repeat lunge. Repeat 10 reps for each leg.