I've been pumping for over 30 years. I started because of a back injury that got in the way of my selfsucking; I could only get to within a couple of inches before my back would start to hurt. Having read that pumping could add up to 4 inches, I though "That's for me!" (how nieve), but of course it's done very little other than give me hours of pleasure and fun. I have made 1 1/4" in the last 3 years though, but that's mainly due to the stretching and jelqing I do. Over a long period of gentle physical exercising and yoga stretching, I've also overcome the back problem and can selfsuck ok now.