Just saw an interesting and/or weird tool designed to help lacrosse players learn how to slide on defense.
You use this "defense slide rope" to tie the defenders together and teach them how to slide in lacrosse. When one defender moves to cover an open opponent (i.e. an opponent who has blown past his middie coverage), the rope "forces" the other defenders to slide and cover.
Here is a link -
Warrior Defense Slide Rope