What's the fastest way to gain 1 inch? If I gain 1 inch I'll be a little over 7inches and I will be very very happy. I would love to gain an inch in 3 months. I'm going to start the jp90 routine tomorrow and just do light stretches tonight. I've been jelqing for a week and a half and alrdy notice girth increase and more veins. I pla n on doing 2 days on 1 day off from now on.