The Sports Inventor

A retired athlete transmigrates to a world of magic, becoming a useless mage.Playing magic? I'm just a weakling. So, let's go back to the old job, play sports!From then on, this magical world has basketball, football, all kinds of sports, and a sports inventor. However, surprises are always more than difficulties:"How many times have I said, no using Whirlwind Technique when playing badminton!""Who is using Flight Technique to dunk, get off the court immediately!""I didn't forbid Druids from participating in the rugby match, but what the hell is it when you turn into a bear?"