Instructions
With two small weights by your side near your shoulders, lie face down on the floor, resting on your forearms. Place your feet approximately shoulder width apart. Raise your body up on to your forearms and toes. Be sure to have your elbows and shoulders aligned. Brace your core. In this position, raise the opposite arm to where the weights are, and reach over to pick up one weight. Bring the weight across the front of you, and place it on the opposite side. Return your forearm to the floor. Raise your arm again to pick up the second weight and again bring it across your body and place it with the other weight. Return your forearm to the floor. Repeat on the other side. Then repeat for the desired number of repetitions.
Tips
This exercise can be made easier by performing it with knees bent on the floor, instead of being on your toes.