An upper body exerciser which is compatible with walking or using a treadmill permits vigorous upper body exercise involving hands, arms, biceps, triceps, shoulders, and neck. The upper body exerciser is a harness that rests on the shoulders of a person with a forward extension presenting handgrips at the distal ends of a hand crank that can be rotated such as bicycle pedals are rotated by the feet. Since the harness is easily donned or removed with just a single motion without the need for confining straps, its convenience encourages frequent use.