Edited sentence: "  Johnson attests that his success in boxing came from the coaching he received from Joe Choynski, who became his cellmate after the pair were arrested for fighting in Texas, where boxing was illegal at the time.He is considered a boxing legend and was the first and only person ever to knock down James J.Jeffries in a professional boxing bout.The aging Choynski saw natural talent and determination in Johnson and taught him the nuances of defense, stating "A man who can move like you should never have to take a punch".Their fight is to this day considered a seminal moment in boxing history