With a dumbbell in either hand, deadlift them from the floor. When they reach your knees, explode upward from the toes, knees and hips, dropping underneath the weights as they are pulled to lockout straight over your head. Catch the weights in a full or partial squat and repeat.
|menshealth.com; use the same form with two dumbbells|
Circus Dumbbells for the Home Gym Made Cheap and Easy
Olympic and Standard Barbells and Dumbbells