The jelq is rumored to be an ancient arabic exercise (although I've yet to find any substantial evidence supporting this).Jelqing is a lot like the push up of penis exercising. It's the backbone of all the other exercises. When done healthfully, jelqing can make your penis bigger and harder - similar to how exercising your muscles can make your them bigger and harder. Healthfully, means not going overboard and starting out light.

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How to increase penile size | Increase penile size naturally