The baseball team at St. Thomas University in Miami has a pitcher named Ben Ancheff, who doesn't have the typical body of an athlete. He's 6-foot-2, and listed at 300 pounds.
It's actually not that uncommon to have a 300-pound pitcher in the majors. Jonathan Broxton of the Brewers is 6'4", and right around that weight. He still looks kind of athletic though, he's just a big dude.
But Ancheff...not so much. Apparently he's actually a decent pitcher though.