Have have it a week and wow it really work already . I feel it in the first couple minute LOL ~ and I even order the woman version too . I figure 5 lb be not that much ~ ugh !!!! it do ... 3 minute on this and I be dead tired . seem like a no brainer to use and do not see why people have issue with it . like any exercise equipment ... if you have not work out in a long time and\/or do not use equipment often enough to understand the gist of it ... get inform and check with you Dr. . . do not be a dummy and hurt yourself .