Now that I’ve had a few days to digest what I saw Saturday at the Garden, it seems obvious that there are both life and boxing lessons to be learned from Andy Ruiz Jr.’s shocking seventh-round TKO of Anthony Joshua. Some of them I knew but disregarded because of my lack of belief in Ruiz’s chances. Some I had forgotten. And some only became clear to me after the fact. This, of course, is the most obvious one. Ruiz is nobody’s idea of what a professional athlete should look like, least of all a heavyweight champion. But there are some guys who are in better shape than their appearance would indicate and there are guys who are comfortable at weights that are considered obese. CC Sabathia, Bartolo Colon, Tony Gwynn and Charles Barkley have excelled in their chosen sports despite ranging between chubby and downright fat. In boxing, Buster Mathis Sr., Tony Tubbs, Tony Ayala and James Toney in his post-middleweight period come to mind. It’s obvious now that Ruiz belongs on that list. Even when they come wrapped in armor like Joshua did Saturday night, everyone’s raw materials are the same. Punches hurt muscular guys as much as non-muscular guys. Witness the body shot Ruiz landed in th...