This is where Buddhism and those East Asian philosophies come to play I believe..
Mind is everything..
Christianity I believe is more of a community type (what should I say..) healing method and that's why it's called a religion..
I believe "focus" maybe the only thing we could purposefully do with our body.. - for eg if we focus we can slowdown, those 10 or so systems in the body.. eg cardiovascular system or digestive system..
If you cannot get your mind to focus, then even Mr Miyagi cannot help you..