The machine was purchased for my husband who is undergoing Chemo. He gets so tired and week from treatments he will loose his balance. After using this machine he is able to maintain his balance and has more energy. The machine does all the work so he is not burning calories but his muscles are working out! The mat that comes with this machine holds it in place and does not slip as others did. I would recommend this to all who have any muscle problems or experience weakness in their legs or arms. I also have used this machine for his arms and that too worked wonders on his arms, shoulders and strengthened his breathing. You can NOT go wrong purchasing this machine!