when I first hear about the shake weight dumbell , I think it be a joke . then I read about it and watch the video and see that it would work in the area that my arms\/shoulders need help with . I find it available thru Amazon.com -lrb- the actual shake weight site be too much $ $ $ -rrb- . when I use the dumbell , I can really feel the arm -lrb- upper , lower , flabby part -rrb- truly be get the muscle go and I have notice some tone since begin with it . 6 minute a day do not sound like a lot , but when you start with this and have not work on you arm in a very long time , it feel tiring and as if you have be work those arm for a hour or so . I think I begin at 2 minute a day and have to reach the full 6 minute in interval over a 15 minute period : -rrb- -lrb- if I be much younger , I probably would not really need something like this to tone my arm and upper body , but be in my 50 's , this seem to work for I . -rrb-