The following video shows a demonstration of a push press:
A push press may be done with a barbell, dumbells, or anything of moderate weight (bowling ball, box, etc.) Stand up straight and lift the weight up onto your chest to the starting position of the movement. Your elbows should be under the weight, which will be supported by the pads of each hand. To begin the push press, bend your knees slightly, then explode back up and use the momentum to press the barbell up over your head, locking out your elbows. Lower the weight back down to your chest. That’s one rep.