It is so incredibly rewarding and peaceful once you get past the odd zones that come and go in the first dozen (for me at ~5k and ~10k actually). I've never ran

It is so incredibly rewarding and peaceful once you get past the odd zones that come and go in the first dozen (for me at ~5k and ~10k actually). I've never ran more than marathon's length, but routinely ran half-marathons for a couple years before my knees gave up and took much of my mental fortitude with them. I never found through other activties anything quite like it, there is just so much peace along with the body's releases.