Why Gina, my dear...It's a sport that allows the use of the complete body(blocking, tackling[with the HANDS, sometimes], throwing an irregularly shaped ball[with the HANDS], running with said ball[with the HANDS], AND sometimes even kicking said ball[with the FEET])...all the while using a complex and very sophisticated stategem of maneuvers, in order to gain the opponent's ground and ultimately with the hope of striking into their protected end zone.
You see, it AIN'T for no reason we Americans are a friggin' SUPERPOWER, while you brits can only dream of lost empire.
Cheers,
Dwight