I have a nephew-in-law who was a star football player. Unfortunately, the injuries he incurred back then are giving him hell today. For years he has suffered from bad knees, both of which have been operated on, to not much relief. He will continue to hurt the rest of his life, and he's only 50.
I learned my lesson at around age 9 playing pick-up football on the school grounds. Got slammed to the ground too many times and suffered from headaches for weeks. Never played again.
They can have that sport, turn it over to water buffaloes. No one will notice the difference.