The Elliptical Trainer with Dual action arms provide a more complete workout, stimulating the upper body as well as lower extremes. Ellipticals done wear on your joints. This is great for people with knee problems. Ellipticals also provide a weight bearing exercise, which helps protect bones against osteoporosis. The elliptical movement can also be performed in reverse. Simply start the pedals moving in a backward direction and make adjusts to resistance and ramp as before. The change in direction alters the focus on the muscles used as indicated on the console. Either way, you are still getting a great workout for the heart and burning a lot of calories at the same time. If you are a beginner make sure that you never get to the point that you are struggling to catch your breath. Kinwi elliptical trainer is the newest elliptical trainers,if you need more detailes of them,please do not hesitate to contact with me directly.Thanks.