i have one.. i was doing it every day and seemed to be doing well.. lost a few pounds.. (could have been from my stress during this time too though lol) when family visited I put it in the back bedroom and forgot about it.. UGGHH I had been doing so well using it every day.. but it is fun and I do get out of breath.. It is rough on your knees and sometimes your arms but **** you can handle anything for 5min or so..