Thanks Will for the info,

I've run into the private instruction thing before. Was training my then 6 year old how to throw the shot put one day at the track. There were two rings to use. After awhile some HS boys came over to the other ring and were warming up. They saw what I was doing with my son and came over to ask me a few things about footwork and such. Not too long after the Coach came over and said he knew who I was and wished I could be a coach for him but that I couldn't interact with the HS kids because of this rule. Since I had been a thrower in college I was considered a professional instructor. Too bad really, I could have taught them Discus & OLY Hammer too.