Picture hundreds of just-minted college grads flying across the country, studying like they've never studied before, spending a few days job shadowing—then finding out right then if they'll ever draw a paycheck in their chosen field.
They spend every minute being evaluated in the biggest and smallest ways, pushed to the mental and physical limit. Many don't even have a prayer of getting hired. Oh, the summa cum laude candidates from the hoity-toity schools know they'll waltz right into a corner office, but nearly all of the rest are just praying for a spot in the mail room.
That's what NFL rookie camps are like.