Ok the days that you have a bullpen or have to catch a bullpen those players are mandated to come straight to the field and then you throw you have them stretch and throw their bullpens then. Your practice starts at 3:30 so that is about the time those bullpens will be starting you have the players stretch and play catch and move your 5 minute meeting to after that time or to the end of practice. May I also suggest you do not start practice when the "last kid walks up." You start practice whey YOU say practice starts and kids are held accountable for that.