Isn't running the one sport that requires the least amount of skill? I can't think of any other sports that require less skill than flat out running. At least a steeple chaser has to time their jumps. But runners... one foot in front of the other.
Aside from discipline, hard work, consistency, and if you're lucky god-given running genes, there is nothing to it. Being able to train high altitude, doesn't hurt either I suppose.
Look at Secretariat...what made him great? Skill? Talent? NO. Upon autopsy, they found his hearts was 2X normal thoroughbred size.
I love running, precisely because of this. There is no skill. No talent. It's just a war of wills in a way.