That's my point. Hardcore running makes you weak and small.
Men have low test levels, women have low estrogen levels, and lose breast tissue, and both get the same "skinny fat" look, with flattish muscle tone. It's best to do medium runs, where you can develop stamina, yet still maintain muscle. Nobody is really designed for marathons, as it breaks down the body---who wants to look like a asexual being?
Just as bbing is extreme for the physique, so is Marathon.