Coaches really don’t expect any degree of thanks or graduate, it just doesn’t come with the job… most of the time. I think it has more to do with the nature of the participants and the game itself more than anything.
But … every once and a while, someone will surprise a coach with a kind word of thoughtfulness, a thank you, or " I appreciated that, coach".
This is a great time of the year to remember such a coach that has helped you in some way. I can guarantee you … it will come as an unexpected surprise. Not to mention a first class gesture.
Then simply sign your name, put a stamp on it and let the postal service do the rest.