A live scoreboard on the wall changes behavior in a way a phone never will. It is public, it is constant, and it turns quiet effort into something the whole room can see.
Lead with the standings
Rank reps or teams with the leader on top and clear movement arrows. Keep it big enough to read from across the room.
Celebrate in real time
Surface the biggest mover and who just entered the prize zone. A rep watching their name climb on the wall will make one more call.
Keep it current
A stale board is worse than no board. Refresh your data daily so the screen always reflects today, not last Tuesday.