Coach Cronin of NE University has shared a few of his High Tempo drills with us. The emphasis of each of these drills is that they need to be done at top speed to simulate game conditions.
Backchecking Drill #1 1v1 with Backcheck
Backchecking Drill #2 2v1 with Backcheck
Backchecking Drill #3 4 Corner Backcheck
Coach Nielsen's Ice Hockey Drills 
These are great drills. Keeping it competitive motivates the players to work harder… They end up getting their conditioning in at the same time