Double Bridge

Firms glutes, hamstrings, quads, and abs

Your quads get an extra workout when you and your partner press the soles of your feet together.

With legs bent and feet flat, lie toe-to-toe with your partner. Pressing the sole of your left foot against your partner's right foot, extend those legs up toward the sky.

Contracting your glutes and pushing down on your grounded feet, lift your hips, so your bodies form straight lines from your bent knees to your shoulders. Keep hips level.

Hold for a second and then slowly lower. Repeat for a full set; then switch legs.