A precision tether adjuster for use with a rebound board, an exercising device including the tether adjuster, and a method for achieving high levels of aerobic exercise in an enjoyable fashion using the device. The device includes a rebound board, and a precision tether adjuster having first strip of hook-and-loop fastening material attached to the rebound board, and a tether having a first end attached to a ball and a second end attached to a second, mating strip of hook-and-loop fastening material. The excess length of the tether is wrapped around the second strip, which is mated horizontally across the first strip at the appropriate vertical level for the user. The length and vertical position of the tether are now optimized to suit the user's requirements, and the tether is secured firmly between the mating strips of hook-and-loop fabric.
