An explanation of the parts of the penis that grow when you do penis hand exercises. You can gain penis size quickly and permanently using simple and safe techniques. Size increases of 3 inches in length or more and 1 inch of girth or more are very doable. I went from a puny 5.5 inches long and 5 inches around to over 8 inches long and exactly 6 inches around. Here are the answers to some frequently asked questions about adding 3 inches of penis size or more with the most effective methods.