My .02... Since the human mind can only concentrate (really concentrate) on one thing at a time, the trick is to so completely train oneself in any discipline, whether it be shooting, working, fighting, etc, that the actions are automatic. Then, while participating in that discipline, one can enjoy the complete experience and the mind's subconscience side will take over the learned functions, and whammo! Zen-like performance. When we shoot a run, or make a play, or throw a tecnique, and it's PERFECT, we say, "wow, that was Zen!". No, you just let go and let your mind's mind take over. Oh, to be in that place more often... As I said, my .02...