Just to clear up some of the pessimistic nonsense being spewed out by smart alecks who, for the most part, have had no experience with this device, or the Bullworker. First of all, the ISO 7X is basically the same as, but is not technically a "Bullworker". The Bullworker is still being manufactured (check it out at thebullworker .com) but it uses plastic coated steel cables on each side as opposed to this device's dual nylon straps on each side. Otherwise, the principal of the two devices is the same. For the record, I still own my original Bullworker (now known as the "classic") which I bought in the early 70's, as well as this device, (which goes on sale once in a while at Big 5 for about $15.99, which was where I bought mine). I also own and use the smaller Bullworker "Steel Bow" which uses interchangeable springs. --BTW, there's a good 6 1/2 minute video on the bullworker site with an older guy (about my age, late 50's), showing how the Steel Bow competes with free weights. The only reason I bought the Iso 7x a few years ago was because the spring in my original Bullworker got weak over the decades I've had it. --Anyway, again, to cut through all the nonsense, no, this device is not going to get you huge and buff, Only heavy duty weight lifting is going to do that, obviously. But.. it will keep you fit and toned, if you use it at least every other day. I use the Iso 7x, the bullworker Steel bow, I do push ups and pull ups (thanks woot) and I'm on an elliptical trainer 20 minutes each morning, and at 57, I'm in better shape than any of the guys I grew up with. --Anyway, I say go for this! At this price it's even cheaper than when it's on sale at Big 5 sporting goods.