I never understood American Football. I once stayed with a friend in Kentucky for a couple of days who tried to explain it to me while watching endless matches, but the minutiae of the rules never stuck with me for longer than one move of the play (except the fact that the New Orleans Saints are some special team which deserves to win by virtue of being from Louisiana). And boy, are these moves short. I was surprised that these big guys need a break almost every minute. Compared to real football where the players work for 45 minutes without any break, American Football is for wussies.
The following film doesn’t add any clarity either, but it’s a very good animation:
(Animation by Fraser Davidson.)