Bloody knuckles indicate bad form

This aluminum knife is what we use
for training. There is no edge or point.
For sparring we use flexible rubber knives.

I've been dedicating time this week to some knife work, practicing box drills on a heavy bag. Practicing the slash-stab on a heavy bag helps me determine my ideal range and it's also helping me adhere to proper form when performing the slash. Bloody knuckles on my knife hand were a clear indicator that my slashing needs serious improvement. Bloody knuckles tell me that my wrist is not bent properly and I'm not turning my shoulder properly, so instead of the blade making contact with the bag, I'm first contacting the bag with my knuckles and only making contact with the blade when I'm almost at the end of the slashing motion. This is no good. What's the point of fighting with a knife if the knife isn't contacting the target? The blade should be doing all the work, not my knuckles. I would have never discovered this poor form if I wasn't practicing on the bag.


Boxing Class
We're reviewing basics this weeks: proper punching form and proper power blocking for head and body shots. I'm good on punching form but  my power blocks need some help. The key to power blocking is to block with the same side of your body as your opponent is using. So if my opponent throws a left jab, I'm blocking it with my right hand. He throws a right, I block with my left. The reasons for matching your block to your opponent's punch are simple: if I block a left jab with my left hand I'm twisting my body to the point where I'm turning my head to the side and losing visual contact of my opponent. It also screws up my distribution of weight on my legs. A power block requires your weight to be shifted to the leg - if I power block with my left hand, my weight should shift to my left leg. This becomes more important when countering your opponents punches. If I power block with my left hand I should be immediately counter punching with that left hand. The thinking is that you don't want your opponent occupying your weapons (your fists) with his punches.

My major malfunction with power blocking is using the wrong hand to block with. My blocking form is OK, but I'm still using my left hand to block a left punch. This needs practice, mental awareness and the ability to read my opponent's punches.