The ability to change direction can set you apart from the pack. There's nothing easier to see on the football field then someone exposed for agility.
The ability change direction can make you a better tackler and evader, and the qualities you train to build it also double as solid injury prevention work.
The AGILITY / CHANGE OF DIRECTION training program is completed in the gym as strength is the name of the game here, but it needs to be trained specifically.
By the end of the 4 weeks you should have improved your agility test time by close to a full second.