The AMBER Athletic Gear Reaction Belt for 2 is an important tool to train for any sporting event. Great for developing agility drills. Use resistance with two people to develop stride length. Provides resistance while athlete runs. It increases your agility via resistance training. Speed resistance build up power, high skill and coordination in the trainee. Resistance training is very important to train for any track and field or other sporting events. Use it to train for various sports. Ideal for sprinters, for soccer training or just agility training. Can be used for soccer, football, baseball, hockey etc.