This simple skating warm up challenges players to change their edges quickly.  Opening their hips and going onto their inside edges is tough for some players so they have to find the balance that allows them to glide on the ice.  Turning with balance, control, and enough speed to come out moving is also tough for player so challenge them to glide through the turns.  They should find one speed and stay at that speed.  As they get better, you can open this up a little more and have them drive out of the turn. 

Make sure to go both ways! 

Try it in your next practice with small groups on each circle.