I brought the ab circle pro from walmart and after putting it together and using it, I notice that the pads you put in the knee cups would come out and you would have to keep fixing them in. But the fourth time on it and I was swinging from side to side my left knee came out when it did I came down on the machine and hurt my ribs and the best part about it I broke my left big toe who would have thought something like that would have happen so it cost me a doctor visit (twice) and maybe surgery on it. I would like to know from the rest of you... read full review »