Meet the SPEEDSTER Speed & Resistance Trainer: a handy kit that lets you perform a variety of speed, overspeed, power, and agility drills. It works with medium or heavy resistance cords to challenge your body. You can use these for upper and lower body resistance training.
The kit comes with resistance cords, waist belts, shoulder harness, 2 handles, and everything you need to get started. More info is available here.