Wow, many insights here! I agree with most of the angles, from Ki development to strong training. I wonder, though, IMHO can't those two aspects combine through concentration? Isn't that zanshin? I find that when I can maintain a powerful, focused concentration--even if I'm not training that hard physically--that I'm sweating like a pig and more exhausted than if I'd run five miles. Could this not be 'strong' training and the development of strong will and ki projection? I have noticed that intense concentration tends to make others a tad nervous...So how to balance powerful focus with welcoming mutuality depending upon the situation; the constantly shifting matrix. A large portion of what I'm working to feel/understand.
Did I wander off topic? So much for concentration