it takes a routine and patience. girth gains come easily. length takes longer. at first gains are temporary, but over time you do gain. you're basically putting your cock in short periods of traction. stretching it out. don't overdue it. I'll pump every other day, and do some jelqing in between. the time after pumping can be fun, my cock remains very thick for hours. a few times, my wife has seen me getting dressed after morning pump/shower sessions, and jumps my bone. if I use it before going out for an evening, women are checking my bulge. my wife knows that I use one. she likes the gains I've made over time.
since I exercise the rest of my body, I figure I might as well exercise my cock.