Paul..go buy an 8-10 pound sledgehammer and 1 sledge hammer shaft from B&Q.
Training with a sledgehammer will build whole body power,especially hands, wrist,arms.
The hammer shaft by itself,doubles as a sword and jo as you can butt stroke with it aswell as stab or chop.
By design it is superior to a jo or wooden boken,cheap and virtually
Um... I'm a bit baffled by this discussion. In my twenties, I regularly used a 8-lb sledgehammer as a carpenter so I have quite a bit experience swinging one around.
How would such an exercise be done? Do you swing it in a sword motion but really slowly? Anything marginally fast would have to end with the hammer hitting the ground.
Amusingly, when actually using a sledgehammer purposely, the only muscle power I use is the raising it up. Then I just let it fall - maybe dropping my weight for an extra bit of momentum...