I've been doing most of the constrictor clamp girth exercises for one month. I gained in totol over .25 inches. My orignal mid-girth was 5.5 and I finished off at 5.80. I was doing these exercies about every other day. Sometimes I would do it 2 on 1 off using the ROP. But, after taking 4 days off straight with no exerices I lost everything!!! I'm now back down to 5.5. This is really sad and frustrating. If these gains are not going to last 4 or 5 days off from doing any exercises why even bother doing it then. You're going to be spending the rest of your life doing girth exercises knowing in your mind that it's only temporary gains. Kind of sad. To all those who have made great gains from clamp exercises, I dare you take a break!