well as many other im sure i be skeptical still be a bit i certianly be not a exersize buff like some people who claim this doesnt work for they its because you have move beyond the level of intensity this product offer but they suppose 6min work out a day to tone arm be such bull in order to feel any burn from this the next day the video\/workout must be do a few time over otherwise its as if nothing have happen so i suggest use this a couple of time in morning and a couple at night at the very least but the more you work with it the better the burn the next day and the more it burn tomorow the better you work you muscle yes it be a bit odd to use and yes it isnt just the `` shake '' to the workout its about 50\/50 you shake it then use it as a dumbell pretty much but it do work the muscle i havent use it much yet so no real improvement yet but im certain if i can manage to keep at it i will see inprovement