I haven't really done much Karate training, though I'm very interested in Karate.

I came across Peter Consterdine, who is an expert in close quarters protection with many years working as a doorman. He is a long time Karate practioner (though as he states in the interview, he has studied other MA as well) and seems to have some interesting ideas about power generation:

"Let your food be your medicine, and your medicine be your food" Hippocrates.