The numbering system can vary from coach to coach, gym to gym, but there is a standard system which most people learn when they first start boxing.
An Uppercut is a punch that is thrown to the body or head of an opponent at close range. This punch requires a reasonable degree of flexibility in the hips, to assist in improving technique when delivering this punch. It is an effective short-range punch (in-fighting) suitable for the short compact boxer.
Like the Lead Hook, the Rear Hook is very difficult to defend against. It is a short, close-range punch thrown from outside the vision of the boxer. This sneaky punch can get behind the defending boxer’s lead glove.
The Hook is a bent-arm punch, used at close-range where the power is generated from the twisting of the lower body and torso to the right side, transferring the boxer’s weight from the front foot to rear. The Hook can be delivered to the head or body after landing a Cross. The Hook is most effective when close to an opponent as an inside power punch.
Boxing, at its heart is a lot like magic… the tools of the magician are not so different from the tactics employed by the master boxer.