I travel extensively and be always on-the-go . so whenever i travel , i can not work out with my weight at home and not all hotel offer a gym . so i decide to try out the shake weight since its not so big and heavy as normal weight . I do not expect that now the Shake Weight have become my favorite exercise ! after use it for a few time a week either when i travel or at home , i realize that my muscle have become more tone . it actually work !