I purchase the Shake Weight when I be advise by my md to cut back on my traditional weight training program after sustain a couple of injury . accordingly , I have use the Shake Weight to either supplement a modify weight training routine or as the sole routine during interval when I be advise not to exercise use traditional weight training method . at the very least the Shake Weight have allow I to maintain my present physical condition . in addition , it certainly provide a feeling of satisfaction . while it do not produce the `` burn '' of traditional weight , it most definitely impart a feeling that be quite analogous to the sensation supply by traditional method . furthermore , when use with vigor , it certainly give the impression that one have sustain a workout session that be actually much longer in length . accordingly , I have be quite pleased with this purchase , and so much so that I actually purchase a second sample so as to have it available at more than one location without have to transport it ... not that its 5 pound would be a hardship to carry ... in fact it seem incredible that its mere 5 pound be capable of deliver such a notable effect ! two final note : the model provide by Amazon be a attractive gray with silver and black accent as oppose to some of the hideous color I have see in model for sale in retail outlet . in addition , the dvd provide be quite useful in explain how to achieve result on both a novice and advance level . however , for optimal result I would suggest progress to the more advanced level as soon as possible .