Someone says ran, crus can run thicker more, be true technetium?

Someone says ran, crus can run thicker more, be true?
This kind of view does not have scientific basis. In the it may not be a bad idea on ran machine, in playground it may not be a bad idea, ran won't let the person's crus run thicker more. The most convincing fact is, the top long-distance runner on the world runs everyday a few kilometers, but have brawny crus without the person. Contrary, a lot of fat person crus is exceeding thick. Often the body fat that ran can reduce you, of crus adipose little, meet of course fine. Run as to what you worry muscle more and more the possibility that develop has hardly. Because resemble the staying power that ran has oxygen this kind to move to be able to increase to already had muscle itself only, can not increase muscle to measure, so the leg won't run thicker more. Only the in a planned way, force training that increases resistance stage by stage just can be accomplished make muscle quantity bigger and bigger. Can feel after take exercise as to you crus is thick sometimes, the muscle that is the provisionality that motion causes only then congests, rest for some time to be able to recover from an illness.