There's three reasons for doing this. To identify their position of strength, to give them basic knowledge of a different position in the event they need to cover in an emergency or for injury, and to give them knowledge of what the player next to them is challenged to do on any given play.
Once Summer Camp rolls around, make a decision and get them ready for the season by solidifying the starting lineup.
Once Summer Camp rolls around, make a decision and get them ready for the season by solidifying the starting lineup.