Running

They are both runners. But they do different sports. 

Would be interesting to see them racing the mile one against the other.

One mile is'nt fair to skinny guy. 3-5 miles would be more interesting

Young cryptoenthusiast, martial artist, life enjoyer

Know few guys, who are good at long distances/marathons and have pretty decent muscle mass(specialization in bodybuilding) . Mostly It depends on your base in sport and your muscle's ability to utilize carbon dioxide and decomposition product. But it's just personal expirience and not a reason to argue

I would bet the “skinny guy” would wind the mile but also an 800mt against the other one.