I was lucky enough to be bad at boxing, bad enough at it that making a living at it was never a choice.
I did use what I learned in that class once. As a LT in the Army a large soldier with a loud mouth suggested that someone should whip the LT’s but. I had the 1st Sgt march the company to the gym, and called a friend in to referee. The soldier smoked, and big slow guys who smoke, well they don’t last long.
After 2 rounds he couldn’t raise his arms. We had no more of that.
I remember TUCO saying something about liking big fat men in the FABULOUS movie, The Good, The Bad and The Ugly:
Tuco: I like big fat men like you. When they fall they make more noise. And sometimes they don't get up.