name a non-fighter sportsman who could make a decent boxer/mma fighter with training

so someone with inherent toughness, strength, speed and agility who might not ever have thrown a punch in anger before but with a bit of training would be a formidable unit jonah lomu ( new zealand rugby player back in the day before his degenerative diseases) andrew sheridan (english rugby player who can almost beat the world weight lifting record) numerous fijian and new zealand maori rugby players - i dont like rugby so god knows what their names are i'll have a think of others while other people add their own - gotta be some US footballers who can join this gang surely?