By Ohio High School Rules, are the practices over the next couple weeks to be pitching only:
B. SPECIFIC REGULATIONS— Grades 9-12
1) Coaching and instruction may begin— March 9, 2009.
NOTE: Pitching and catching candidates may begin throwing with pitching instruction
two weeks prior to this starting date— February 23, 2009
I copied this from the rules section. I interpet it as coach pitchers, but if you do anything else (hitting, fielding), it has to be without instruction or same as open gym.