Lol. Jelq....truly reminds me of the good old times. The technique itself might be plausible, but try it yourself and you know what 'swollen' means. There is bigger chance to hurt yourself or worse, pop off some of your blood vessels on your yardstick.

I did it before too. But the reps are a bit painful. Improvements? Yes, a bit, it does feels heavier and looks muscular. Probably due to your blood vessels popping off....but I guess I found better things to do in free time than to jerk off.