Here my client using a 14 pound mecine ball.  The starting position should be either in a fighting stance or a shoulder width position.  Unless you are doing it from a fighting stance, in which case your elbows will be alongside your body, I like this drill with the elbows out.
This is a great exercise for building upper body power and strength.  It is fundamental to those who train in the combat sports.  This plyometric also builds coordination and helps to reinenforce the concept, ‘keep your hands up.’  If you seek more punching power, give this exercise a try.  I do series of 30 second... Read more »