I be a `` young '' almost 62-year-old . while I be pretty fit , I have notice , and worried about , lose muscle mass . I see this on a `` health '' website I subscribe to . buy it for $ 30 at Walgreens . figure that for $ 30 it be a good risk . in two word : it work ! although I be not fanatical about it -lrb- use it every three day or so -rrb- it have make a noticeable difference . -lrb- Disclaimer : it will not turn a couch potato into Mr. America . -rrb- about two week after get it , my wife and I be at she family reunion on the beach in La Jolla , see family and cousin we see 2-3 time a year . I be curious if it would be notice without my say anything . it be notice ! everyone remark on how `` buff '' I look . Pretty good endorsement ! I think I might have help sell a few . key point : as the first part of the dvd point out , you must grip the shake weight tightly . if you hold it lightly , you can shake all night and it will not help . I wonder if people who say it do not work be grip it lightly ...