I wouldn’t say that most runners are shaving their legs. But because it’s a very demanding sport some keep them smooth for the same reasons as other male athletes: keeping cool, no pulling on hair with massages and showing off leg muscles.
While they know how to shave their face, they should check out: How To Shave Your Legs
What do you think about men shaving their legs? Read my personal opinion and share your thoughts on: Should Men Shave Their Legs?