I believe that pumping, over the long term, is the only method (short of surgery of some sort) that can produce permanent results. It makes sense to me that, like building bigger muscles, that the 3-dimensional stretching done by pumping, creates tears in the tissue fibers, that the body repairs by adding new tissue, just as with muscles. Over time these accumulate and increase both length and girth. I've been pumping for 30 years, starting at about 5" L x 3.5" C and am now 7.5" L x 6" C ... and that's a permanent gain. Even if I don't pump for weeks (once took a break for over 6 months), that size is permanent. And it's not puffy or squishy ... as it will be for a few hours right after pumping. And, if you follow instructions, it's totally safe. The FDA even has a website with instructions and troubleshooting guide ... a pump and cock ring are FDA approved for ED so doctors can even prescribe it. In fact, this was how I was introduced to it. A friend had a bicycle accident and developed ED from nerve damage in his scrotum - his doctor prescribed the pump and he showed me how it worked and how good it felt. That being said, I'm sure jelqing works too, but doesn't feel as good as pumping. My advice would be to get a pump with a gauge and, as is standard practice, start with low pressures (actually vacuum in pounds per square inch or PSI) say 5 to 10 PSI for 5 or 10 minutes, then do this several times a week, gradually increasing to 15 PSI for 15 to 20 minutes as your comfort level increases. You'll likely need to trim pubes at the base of your cock so the pump cylinder can get a good seal. My approach tends to be analytical ... the mindset of an engineer, I suppose!