gives them a chance to get on you and explore you on their own, without being forced. it takes a few trips or more depending on how scared your gliders are of you. But I think its very important for your glider to get to know and trust you.
we have one female that is scared of us, but tent time she follows the other gliders and gets all over us.
gliders are exploring animals in the wild, so giving them a place to roam and run and jump is also very healthy for them. I read that a cage should be the gliders sleeping home NOT their prison. the more you can let them out in a SAFE area to go the better.