It took me until last year but the answer is very simple . When i do these things I have 100 % concentration and I am completely absored in the present. It is the only couple of things that holds my attention and I focus with precision. I think the secret to being happy in life is finding something to lose yourself in . When im doing a trick in skating it is a weird higher state of consciousness that I only get remotely close to when playing a good gig live or when I concentrate on hard on an analytical problem.