If you're looking to firm your butt, Shape has a terrific butt workout that combines resistance training with yoga stretching.

These dumbbell workout routines will strengthen your entire body, especially your shoulders and butt. "Your breathing should dictate the pace," says Amy Cheryl, who uses this toner in her Flexxation class at Equinox Fitness Clubs (flexxation.com).

Here is the dumbbell workout:

1. Place the dumbbells on the floor to the outside of each foot. Exhale as you lunge back with left foot so right knee is bent 90 degrees. Place hands on the floor on either side of right foot. Inhale and lower left knee to floor.
2. Exhale and straighten right leg as you raise left leg behind you, foot flexed [A].
3. Inhale as you return to the lunge position and pick up the weights. Keeping back knee on the floor, exhale as you lift your torso and raise your arms out to each side to shoulder height, palms facing floor and elbows slightly bent [B]. Inhale as you lower the weights to the floor, then repeat the entire sequence.

For these butt workout routines, you'll need

Not much: only two 2- to 3- pound dumbbells (find them at target.com).

Dumbbell workout details

Do 2 sets of 8 reps twice a week. Beginners, do it without the weights.

Make your workout routines harder

Use 5-pound dumbbells and hold each part of the dumbbell workout for two breaths.