I too be very skeptical that anything could make you much stronger in just 6 minute a day . follow along with the man 's version dvd actually take 9 minute . wife and I do the workout together 2-3 time per week and I be use the man 's weight 5 time total each week and have be do so now for 5 week . we both agree that the dvd in the man 's weight be much better . man . . do not believe in any review that foolishly tell you to save a few buck and just buy the woman 's weight . unless you have absolutely no arm\/shoulder strength at all , the lighter weight will be a true waste of money . I buy the woman 's product first and it be way too easy and I be no big muscle type . even though I use both a Weider Crossbow and a Trimax machine 2-3 time per week year round , this amazing little gizmo have give I substantial strength gain especially in my shoulder . there be 4 basic exercise and all four heavily utilize the shoulder . as a runner for 42 year , I have marked increase in power in my armswing and as any runner know , when the arm die ... the leg soon follow . the tv add may look a little silly but the Shake Weight really do work and it only take 9 measly minute out of you likely busy day . try it several time and follow the proper form on the dvd and you will be totally impressed ... first by the amazing burn you 'll feel in such a short time , and then by the eventual strength gain .