Abstract: An amusement and exercise ball has an improved simplified harness securing the device to the human body, having a flexible single mounting plate for a hoop, a single body harness strap permanently secured at a first strap terminus to a first end of the mounting plate, and an adjustable buckle secured at a second strap terminus and fastening to the mounting plate hook second terminus. The hoop of the device is centrally and rotatably secured on the mounting plate. The mounting plate hook second terminus is integral with the plate. The adjustable buckle has a terminal narrow strap slot, a parallel mid-wider strap slot, and a terminal slot adapted and sized to secure to the mounting plate hook second terminus. The hoop is slidably rotatable by finger tips to any angular position on the mounting plate, being functionally held in position by a clamp washer, and a locking collar.