Dallas Cowboys offensive line coach Paul Alexander has a unique way to determine if a player will be successful.
Per SB Nation Radio's Bobby Belt, Alexander wrote a passage in his book, Perform, about the importance of properly dispensing ketchup from the bottle:
Bobby BeltCowboys OL coach Paul Alexander wrote in his book "Perform" about how he can rule out certain offensive lineman playing for him by the way they dispense ketchup from a bottle. https://t.co/zXDGT057jm
Alexander's book was released in 2011. It details his time working as an assistant coach in the NFL and a student training with concert pianist Albert Muhlbock.