Sit down on a flat bench with a pair of dumbbells resting on your thighs. Kick the dumbbells back using your knees and rock yourself down onto the bench while extending the weights directly above you, palms facing in.
With your feet, butt and shoulders firmly planted and a slight bend in your arms, lower the dumbbells down in a circular motion until your upper arms are parallel to the floor.
Press the dumbbells back up following the same circular path until you feel a strong contraction in your pecs, and repeat.