Stand up straight, and hold two dumbbells with palms facing each other.
Lift up your left foot so you are balancing on your right leg. Find your balance, then sweep your left leg back, and extend your arms toward the floor.
Holding this position, bend your elbows back, so the dumbbells meet the sides of your chest. Keep your shoulders down and elbows straight back.
Do 10 reps on this leg, then repeat for an additional 10 on the other side.