To give yourself a better chance to block punts, substitute a back-up reciever (or any fast and tall player) at one of the outside line positions. Just before the snap, move selected player just outside the line. Rush at the snap and jump in front of the punter. This will often result in a blocked punt or even a tackle if you get back there fast enough. Occasionally a running into the kicker penalty will be called if you jump on top of the punter.