Are you serious? If they were too thin, they would be sick, and they would not be as fast. They are thin because they are incredibly fit (not to mention incredibly talented), and they are incredibly fit cause they ran tons of miles all summer, and did plenty of quality work all fall. Do you really think people run the times these guys ran, or that Ritz ran, off of 50-60 mpw in the summer? Get real! They are fit and they are fast and they worked their asses off to get there, and congratulations to them.