Resistance bungy rope for partner training. Simply attach the rope to the runner using the supplied Velcro waist band, run forward and your partner pulls back on the handle at the opposite end to provide resistance. This is a great way to add more resistance to your plyometric drills, sprinting or other sport where explosive acceleration is required. The idea is that after adequate training, once you take the resistance away you will have adapted to the additional load and consequently have more power when the load is removed.