The Uber Soccer Strength Training Bag is an incredible training tool.  

The Uber Soccer Strength Bag breaks the tradition with static resistance devices such as free weights which adhere to a singular plane of motion (i.e. creating resistance by pushing or pulling weight away from and toward the body), by using accelerating and deceleration movements to swing and spin the bag at various angles to athlete's body. This results in the Uber Soccer Strength Training Bags ability to increase overall body strength and agility.