Runners carry coaching messages out to players on the field - a maximum of three message per 'run' . Runners often assist trainers to escort injured players from the field. Many coaches confer with the runner with respect to coaching tactics.
For the first half of the season at U9s level, runners are free to remain on the field to instruct players with respect to how the game is played.
Runners must always refrain from talking to the umpire - especially regarding their umpiring decisions.