Abstract: An exercise device having an elongate, substantially rigid pad. The exercise device also includes a pair of handrollers, each handroller comprising a handgrip supported between a pair of wheels. The device also includes a pair of stretchable tensioning members. Each of the tensioning members interconnects a respective one of the pair of handrollers and the pad.

Abstract: A reflective projection screen has in a first aspect a plurality of reflective elements. The upper surface of the reflective elements is either coated or textured to interfere with reflection of light from the upper surface to an adjacent reflective element. In a second aspect of the invention, a screen is provided that reflects light in the vertical direction like a plane surface, while reflecting light in the horizontal direction back toward the light source. In a third aspect of the invention, a projection system projects a three-dimensional image.

Abstract: A reflective projection screen comprising multiple horizontal row segments facilitates directing a reflected image to provide a wide horizontal viewing angle within a relatively narrow vertical viewing band. Each horizontal row segment has a surface that distributes incident light over a wide horizontal angle. The vertical inclination of each row segment is varied from the top to the bottom of the screen to direct the light vertically.

Abstract: A personal watercraft that includes at least one stepper. Each stepper is pivotally associated with a propulsion member that is moveable in a generally vertical direction so that the propulsion member is in a first position during downward motion of the stepper and a second position during upward motion of the stepper.