College football's best and brightest are descending on Indianapolis this week to be poked, prodded and put through their paces at the 2013 NFL scouting combine.
Among the innumerable tests and drills that those players will be put through is a medical examination, with doctors from across the National Football League checking the youngsters from stem to stern to insure that they are in tip-top shape.
For some players there will be no more important aspect of the combine.
For these players a clean bill of health could mean millions of dollars, while a "bad" exam will only add to the medical red flags surrounding them.
Here's a look at a handful of the most prominent ones.