Using exercise to increase the size and hardness of your penis works similar to how exercising your muscles increases their strength and size. You apply stress to the penis, and it works out its smooth muscle and other tissues.
Although it’s commonly believed that the penis isn’t a muscle, this is partly a myth. The main body of the penis consists of three circular chambers, collectively known as the corpora cavernosa and corpus spongiosum. In a healthy penis, the chambers are made of roughly 50 percent smooth muscle. | 
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The smooth muscle in the penis has a several unique differences from skeletal muscle like your biceps; yet it is just as essential to the shape and size of your penis as your biceps are to the shape and size of your arms. When you exercise your penis, you're causing the smooth muscle cells to develop and adapt under pressure. Overtime, this adaptation has been proven to cause your penis to grow bigger and harder. |
