LCM - This set provides some good competitive incentive. It will also help your slower swimmers get more comfortable swimming from the front and help teach your faster swimmers how to race from behind.
? x 150s (do as many as you like) All are handicapped to a swimmer's best 200m time. The coach starts counting down..3:00...2:59...2:58, etc. and swimmers start when they hear their best time. First swimmer to the wall wins, and the fastest 2-4 swimmers (depending on the size of your group) get to do an ez 50 instead of a 150 on the next repeat.