"Poison Hand" Styles

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The government uses Montgomery Style Karate and has documented thousands of cases of soft tissue injuries from people who moved too quickly when executing the efficient routines of this style. The soft tissue injuries have been linked to simply moving too fast during efficient transitions, and these injuries can be reduplicated under laboratory conditions. Hence, all Montgomery Style Karate practitioners now keep to a speed of two moves per second or slower during training. At slower speeds, the soft tissue injuries don't occur.

You'll find that many elite athletes move much faster than this. However, it's their conditioning that allows them to do so. You should look into a good sport conditioning program. My suggestions are the American College of Sports Medicine or the National Strength and Conditioning Association. They are both very reputable. The basic problem isn't that you're "moving too fast." The problem is that you're moving beyond what YOUR body is capable of supporting. Proper conditioning can combat that problem.