The National Football League has never been for the weak at heart. It's rough, it's hard-hitting, dangerous and bloody.
The toughness label is usually reserved for players who play every position but quarterback, punter and kicker.
Former NFL safety Ronnie Lott had the tip of his pinky finger cut off to continue his NFL career. Defensive end Jack Youngblood, formerly of the L.A. Rams, once played with a broken leg for three games.
But quarterbacks are tough as well.
Recently semi-retired quarterback Brett Favre is known for his toughness as he holds the NFL record for consecutive starts at 297 games.
Three-time Super Bowl champ and Hall of Fame member Troy Aikman was frequently beat and battered in the early years of his NFL career with Dallas, but always seemed to bounce back.
In order to be a successful NFL quarterback, players have to have a great level of toughness and a high pain tolerance, just ask former Texans quarterback David Carr.
The NFL has adopted new rules to protect NFL field generals, but defensive players are always aching to lay that vicious hit that makes SportsCenter. Bone-crushing hits are signature hits and quarterbacks are often on the receiving end of those hits.
They are amongst the toughest players in the NFL.
To prove that point of roughness, here are 20 of the league’s toughest quarterbacks.