Founded in 1987, Stamina Products Inc. is a provider of exercise equipments. Based in Springfield, Mo., it offers a range of products, including dumbbells, kettlebells, ellipticals, exercise bikes, inversion systems, rowers, steppers, trampolines, treadmills and many more. In addition, it provides accessories, such as stamina fold-to-fit equipment mat, Stamina Aerobic Step, Body Dome with instructional golf digital video disc (DVD) and Crystal Edge ball workout digital video disc (DVD). Stamina Products Inc. also offers customer service, which includes replacement parts, return policy and product registration.