[JimRed]

Ultra-marathoners are nothing but skin and bones.

Nope. 26.2 miles and up requires substantial muscle. Lean, wiry muscle. What the ultra-guys lack is FAT.

[RoosterRedux]

That's easy for you to say, you're not a hungry coyote.

That said, as a former trail runner (though not an ultra-marathoner), I would agree with you.