I would prefer to say something positive , but I can not . the motion of each end be very slight and make no click or noise , so you get no satisfaction and no particular value in a work out . two $ 5 2 1\/2 lb weight from a discount store would do you more good than this basically useless item . I do not understand all the positive review . they must be from friend of the manufacturer . I guess I could say they have good commercial because I buy one , but they do not even act like the one you see in the commercial . I be give mine to any one who will take it .