after read a ton of review I finally give into curiosity and buy the shake weight . and while many of the review who talk about feel a burn be correct I think it be important to consider the situation of the user make the review -lrb- which be not always clear -rrb- . for I , I work out a couple of time a week at a normal gym use mostly free weight that be a lot heavier than the shake weight , I have honestly find the shake weight routine to be a good way to get a bit more of a muscle burn . however , I do not feel that the weight itself create a lot more resistance than do high volume rep at weight that be 5-10 lb less than you normal set . that say , my girlfriend who do not do a ton of free weight work and instead focus she work out on cardio and yoga get a really strong burn and be even sore the next day . thus far she be find that the shake weight have seemingly be pretty effective as a addition to she routine and something that be very valuable . point being , different people will get totally different result . personally , I think the product be pretty interesting and I 'll probably continue to use it at longer interval , but I honestly do not think you 'll end up look like the fitness trainer if this be all you do . also I might feel differently if there be a slightly heavier version of the product or on that require more effort to shake .