well it work and but not as effective as other would have you believe . I mean if you get arm that be flabby saggy and drag on the floor there no way this will work for you . if you have the type of arm like I do that not saggy but have a enough fat to block you from see muscle detention and have like a inner fat do not no how else to explain it . this will most likely not work or work very little , how to explain if I flex my arm it feel hard but look like cooking dough . so after about a year with this there be no way this will work like I want it to , but it dose work just not go make you have arm like the Rock .