I will skip the tech stuff and go with a top hobby: Advanced Marathoning, 2nd Edition - Pete Pfitzinger, Scott Douglas It's heavier on the biology and human k

I will skip the tech stuff and go with a top hobby: Advanced Marathoning, 2nd Edition - Pete Pfitzinger, Scott Douglas It's heavier on the biology and human kinetics in a way that I don't need a bachelors in a hard science to understand and is quite well known now to serious runners. I read it every year as a motivator and to reinforce the importance of training smart.