Coaches on field

[jchamp]

JV and below, I usually try to mark the ball as close to the nines as I can. As I walk backwards to the sideline, I shoo them back, a stern admonition to keep behind me during the first couple series can be a good preventative measure.
I've occasionally plowed into coaches while following blown plays. Administer it as necessary.
In HS, there's no reason for a coach to be beyond the sideline except in timeouts, (or the occasional desparate-timeout-while-near-the-goal-line). Especially true if that sideline has a chain crew that knows how to help. I've had plenty of that responsibility, as well.