No matter what sport you play, speed and agility is an invaluable asset to your success. Being able to go from point a to point b as fast as possible is very crucial. Adding agility to the equation of speed will make you practically unstoppable. Being nimble and quick on your feet will allow you to cut and change directions without having to drastically alter your speed or movement.
Take a look at some photos of training in progress. Here you will see techniques such as tubing, hurdle agility, and ladder agility drills.