If a heavy bag is not hung at the optimal height, it will not respond to punches in the right way, and the feedback it gives the boxer will be compromised. Because the heavy bag is an important tool for learning correct technique, it is essential to hang it so that it responds consistently to a correct punch.
Heavy Bags and Boxing Technique
The heavy bag helps to teach punching technique primarily through feel. When the boxer connects with the bag at the correct point and in the correct way to score an effective punch on a human opponent, it should feel approximately the same to strike the bag as it would to strike the person. Punches at the height of the head should make the bag move backward, while punches to the height of the body should resist the force a bit more. Either way, the bag shouldn't move too much or feel too soft or hard when being struck. All of these factors can be effected by the height at which the bag is hung.
Freestanding Bags
Before determining the correct height for hanging your heavy bag, you should decide whether it's a good idea to hang it at all. It is possible to knock a heavy bag and its chain off of the ceiling with a powerful punch, and this can result in damage to the ceiling or the beam from which the bag is hung. If you don't have a strong beam or ceiling capable of supporting a weight of 70 to 100 pounds that vibrates every time it is struck, consider a freestanding heavy bag instead.
The Head Height Approach
One approach to determining the proper height for hanging a heavy bag is to line up the top of the bag with the top of your head. The rules and tactical approach of boxing favor the knockout strike to the opponent's head, so it makes sense to hang your heavy bag at a height where it will be easy to practice punching a target at head height. However, it is possible to get a little more specific in your calculation.
Finding the Sweet Spot
Every punching bag has a "sweet spot," or optimal place to land most of your punches. If your punch lands below the sweet spot, you will feel too much resistance. If your punch lands above the sweet spot, the bag will spin around without moving backward. If your punch lands on the sweet spot, the bag will be knocked back, just like an opponent staggering backward from the power of an effective punch. Most heavy bag manufacturers place a label at the sweet spot on the bag, so if you hang your punching bag so the label is around the level of your own eyes, you can find the sweet spot easily and consistently. By placing your punches with correct technique on this exact spot, you can learn how to hit with knockout power.
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