Julio Cortez/Associated Press
Few players in college football history were as talented as star USC running back Reggie Bush, but even he thinks he wasn't ready for the NFL at 18 years old.
Bush addressed the idea of players leaving either straight from high school or college in less than three years to enter the NFL draft and said, "NOBODY is physically mature enough at 18 years old to play in the NFL with grown men." He also referenced a hard hit he took during his rookie season when he was a member of the New Orleans Saints:
"You would be signing your son's death certificate," he said in response to another tweet.