First the pack is heavy and we 'got' to try lots of new things; like putting a heavy pack off and on at the bottom of the pool. I found breathing through my nose especially hard; it's necessary to clear the water out of your goggles. No water breaks or potty breaks either. And did I mention that the pack is heavy?
That effortless glide you see scuba divers doing? It takes a bit of practice to get....None of us got it. The pool was too small and we worked on 'skills' necessary to save your life underwater ....things like sharing a tank of air. I guess we get to do the effortless glide in 2 weeks when we are in a lake.