Lengthening Penis Exercises: Grow Pennis - Version - Did you know that the safest and sure fire way to lengthening your penis is with penile exercises? Yes exercises do work in enhancing your penus size. But to know more about exactly what a lengthening penile exercise can do and how you can maximize the impact of this activity, it pays to know a bit more about what really happens when you do these exercises. So learn from the pro and your sure to increase the size of your penis.