My current thinking is that, not only is varying your workout important, but it is probably best to constantly vary your workout. What's your opinion on that crossfit shizzle? It looks geared towards people who have a mini-gym in their garage or basement or something. But each day's workout is pretty different from the last.

I've just noticed that doing the krab magna stuff, which involves a lot of punching and kicking until burnout, has really unlocked a bunch of stamina and explosive strength, and I think that's as much because it is different than the kind of working out I get in Aikido as anything.