Y.A. Tittle
Tittle was the subject of one of the most legendary and iconic football photographs ever. However, arguably this famous shot of the great quarterback should never have happened. The Giants suffered a stark decline in 1964 and age began to catch up with the signal-caller.
Then he suffered a brutal hit that left him with a concussion and broken ribs. It’s dangerous to play for too long in the NFL because things can go wrong in an instant. Players test their luck every time they step onto the playing field and risk their health (via USA Today Sports).