I order the shake weight after much debate on how well it would work . it do give you a bit of a work out and you muscle will feel the burn after a while . my problem with it be that it do not shake very easily . it be as if there be something that keep it from slide back and forth internally very well . it make it much more difficult to use than what you see on tv . it make a whooshing noise as you shake it which be a little annoying . the biggest problem be get it in the righ position for it to actually `` shake '' since it will not move back and forth easily like it appear to on tv , it take a lot more effort to get it to shake . I be disapoint with how easy they make it look vs how difficult it actually be to make it shake . thus far I be unimpressed and would prefer to just use stationary weight .