“There are no wrists in boxing…The forearm and the fist should be used as one solid piece, like a club with a knot on the end of it. The fist should be kept on a straight line with the forearm and there should be no bending of the wrist in any direction.
Bruce Lee in Tao of Jeet Kune Do
If you start conditioning your hands using a wall bag or a heavy bag, you’ll quickly discover the weak link in striking.
Its in the wrists.
Strikers should pay a lot of attention to strengthening their grip and their wrists.
Developing your striking power has many parts. You must learn to use the ground. You must learn to use your structure. You must relax. You must move in a coordinated fashion (Sam Yi Hap Yat).
As your capacity to deliver force increases, you will probably reach the point where you discover your wrists have a dangerous tendency to buckle. This is especially likely to occur when training on a heavy bag or a “banana” bag. These bags swing and move and will reveal what happens when you strike a target with your wrist in a less than perfectly aligned position.
The wrists and the grip also come into play in actions like the Lap Sau, the Toi Sau, and the various pulls.
Having supple but strong wrists and a powerful grip will amp up your game in many ways.
Bruce Lee was notoriously finicky about developing this part of his body, as you can see from these photos.
You can see it with boxers and MMA types also. This is one of the things developed by hitting a big tire with a sledgehammer. Old time boxers like Gene Tunney and Dempsey used to chop wood.