full disclosure : I be a woman , but I buy this version because the review be better , and supposedly this version be sturdier . I lift weight to build strength , to tone , and to charge my metabolism . I use barbell at about 35 pound , maybe 40 if I be feel it , and a 50 to 60 pound kettlebell , just so you have a idea . my arm be not that rip , but I be curious to try this product anyhow . it be a little tricky to use , but frankly you either get it or you do not . it really be a matter of master keep you hand still so it can work you arm -lrb- supposedly -rrb- . yes , it do create a sort of tension in the arm near the bicep , but it be a strange feeling . it be not a `` I just shred some weight '' tension , it be a `` my muscle fascia be really tight '' tension . I have keep the rest of my weight routine the same and I have not see any difference . honestly , I think this product be probably just a fad . I do give it two star because it be sturdy ; I have drop it and it do not break . but skip this one and stick to real lifting .