That's much easier than the rules for cricket.

American football is hard to avoid over here....sadly. It is inherently a dangerous game, even with all the padding. It takes a lot of athletic ability to do most of what they do, but after my high-school years, I slowly tired of the entire system... partly because of the sleazy, money-laden support of supposed 'student athletic scholarships'.

Watch it for amusement if you must, but resist any widespread attempt to get it into schools.