re: Son might not make a team.

I think the biggest thing I impress upon mine when he isn't starting or isn't getting PT and bitches is this - you gave the coaches an option when you were chasing girls instead of lifting, when you were drinking soft drinks instead of water/electrolytes, when you were sitting on your arse all weekend instead of working on footwork, hand movement (he is a O lineman) in the yard.

Choices were made that put you in a less than optimal state to best help the team. And that's fine - life is full of choices. Those choices have consequences. And its not the end of the world not to start and/or get "enough" PT. I know all of this because I was basically him in high school just in a different sport (bball for a short year + part of a season).