Partner exercises make staying in shape more fun

1. Circle of Love Rotation (aka Seated Rotation With a Partner)

Co-workers (not lovebirds) Anlla Smithson, 42, right, and Sam Fullilove, 21, (we love his name!) hone their internal and external oblique muscles and tone their arms at the same time. To do it yourself, sit back-to-back on the floor with your partner, legs extended in front of you and knees slightly bent. Grab a weighted medicine ball (they're using a 10-pounder) and pass it side to side.

2. The Tush Push Press (aka the Partner Pushup)

Want to strengthen your upper body and core muscles and improve all-over stabilization? Stewart and one of her clients, Rabah Rahil, 26, an IT manager, show us how. One person holds a full plank. The second person places one hand on her partner's hip and the other on his shoulder girdle. (To modify, the person on the bottom can bend his or her knees.) Now, give us 10!

3. The Bodacious Booty Squat (aka the Partner Squat)

Bobby Godsey, 41, and his fiáncee, Suzy Zavala, 33, illustrate why squats are more fun with two. To do it yourself, stand back-to-back with your partner, then lower yourself into a 90-degree knee bend. Now hold! See who can stay in position longest. You'll tighten your gluteus maximus, legs and core muscles in a snap.

4. The Sweep Me Off My Feet Squat (aka the Piggyback Squat)

This one's tough, and only recommended if one partner is considerably stronger and bigger than the other. Rahill and Stewart teamed up again to show us how to do it. The stronger partner stands while the other climbs onto his back, piggyback style, carefully wrapping her arms around his shoulders. Next, the first person slowly bends his knees, executing a squat with his partner on his back.

5. You're My Cutie Crunch (aka the Horseback Crunch)

Rahill and Stewart modeled this one for us, too. The stronger partner squats on the floor on all floors, like a horse. The second climbs on his back, then leans slowly backward, arms clasped behind her head. Next, she uses her abdominal muscles to raise and lower her body. For variation, try twisting from side to side as you crunch up.