I expect that this would move a little more as I use it . it feel really stiff \* snort \* and like it do not do too much . I do notice some strain in my muscle after I do the include dvd workout . which be actually pretty surprising . it be not all bad , but I guess I expect more shake type of movement of the actual device as I be shake it . it feel almost like you really have to force out this to move much . ah well , get what you pay for I suppose .