My son just loves football.  He plays for his high school team. Football ranks among the most popular sports
My oldest son has also played football for an elementary team. How have you managed to keep him motivated to play?
He needs no motivation. He loves football and watches it all the time. He is forever telling me the rules - about the offense and attempts to advance down the field!! 
That is great. He must be exciting to watch and fun to be around. I hope he continues his passion for it.
American football rules
Game play in American football consists of a series of "downs", individual plays of short duration, outside of which the ball is "dead" or not in play. These can be plays from scrimmage – passes, runs, punts, or field goal attempts (from either a place kick or a drop kick) – or free kicks such as kickoffs and fair catch kicks. Substitutions can be made between downs, which allows for a great deal of specialization as coaches choose the players best suited
passionate about. All you need is permission. Not only for "Glee", but for anything in life."
Finn is the star quarterback of his high school football team, and risks alienation from his friends by joining the school's glee club. He is a popular jock at the top of the school's social hierarchy, but when forced to join the glee club, he finds he loves it. His storylines have seen him struggle with his decision to stay in the club, which is at the bottom