Abstract: A crawl swim exerciser includes a substantially horizontal elevated beam supported on and between spaced-apart head and foot supports, supported above a supporting substrate supportable of lower ends of the head and foot supports, with a roller mechanism being supported on and rollable along the elevated beam. Supported on the roller mechanism and slung below the beam is a support harness positioned to intermittently suspend a person's horizontally-positioned body lengthwise in a swim-position substantially lengthwise parallel with the beam while leaving legs and arms of a suspended person substantially free for making swimming leg kicks and swimming arm strokes.