I did a lot of form training in the karate class I was in. All of the punches were snap punches which are supposed to be better for the joints because there is no lockout.
Over time I worked out a few things with my weightlifting and made a big gain in strength and added 20 pounds in a short period of time.
It was at this time that I started having a lot of pain in my left rear deltoid. A while later after I had read the 7 minute rotator cuff solution I learned why this had happened to me.
The rear deltoid is the one muscle helps the rotator cuff hold the shoulder together. One of the excercises the book warned about was shadow boxing. As soon as I read that I was kicking myself saying no wonder why all the Isshinryu people have bad shoulders.
Two of the hallmarks of Isshinryu karate that sets it apart from all other karate is we don’t extend punches or kicks past 90% whereas all other karates go 100% and lock the joint. The other is we snap our kicks and punches back. It’s the snap techniques that places a lot of strain on the rotator cuff or hamstrings.
What happens is at the end of the punches travel, the humerous tries to pull out of the glenoid fossa. The only thing holding it in there is the rotator cuff so they take the stress of this. If you add a 15-20 pound weight to what these small muscles have to stop you are compounding the problem.
7 minute rotator cuff solution says that 20 pounds is the max to lift with the rotator cuff excercises no matter how strong you are. So imagine what 20 pounds ballistically loading those muscles can do.
Bruce Lee was critical of forms as just hitting air. I have to disagree. In a fight (real or sparring)you will have times where you do not connect. You need to be able to control yourself and recover quickly when this happens. Shadow boxing and forms is a good way to learn this.
So I’m not totally against it you just have to be careful because you can tear yourself up.
The two best ways to develop raw hitting power is hitting a maki wara or a heavy bag.
But neither is quite the same as hitting someone who is moving blocking and fighting back. Like Lee said, boards don’t hit back.
When you are fighting if you see an opening and think “there is an opening” it’s gone. With sparring it becomes second nature that you read your opponent and see an opening before it quite becomes an opening.
Timing is extremely important. Weights will change your timing aiming and focus. They could make the difference from consistantly nailing ribs to consistantly hitting elbows.
What Lee described as attributes, (genetics,timing,instinct,talent etc.) are why a Randy Couture can have a suboptimal training routine and be a world beater.
Unless you are really small and weak, actually getting out and fighting is going to do more for you than time in the gym.