I have be work out every day with this weight for two week now and it absolutely , positively work . I have notice that the older woman in my family lose muscle tone in they shoulder and arm as they age and I decide I would try to do something to prevent that from happen to I . I can not believe how much this have do for my arm . I look absolutely ridiculous use it but I feel so much stronger and tone . I have injure my shoulder in the past -lrb- once do pilate on a reformer and once carry a luggage -rrb- and I have have absolutely no problem with the exercise on the video . this be the only piece of equipment that I have ever purchase and actually use every day . I just keep the video in my laptop and work it into my schedule during the day . thankfully I work out of a home office where no one can see I !