I really appreciate the feedback.

You know, the simple thing that happens during exercises is the repeated contraction of the muscles you are exercising. And there is something about muscles, few contractions of muscles a day can lead to the hypertrophy of the muscles, This means increase in the mass of the muscles. This also improve the nerve supply for control and coordination of the muscles.

Now, kegel exercise is the repeated contraction of the muscles of the pelvic floor. This increase the mass, and improve your control over the muscle. And when you are able to control the muscles of your pelvic floor, it enables you to control and hold the penis erection. The penis will be firm, and the erection will be longer.
Kegel exercise have other benefits, which include the conscious control of the bladder contraction.

Just locate your pelvic floor muscles, by trying to stop the urine flow the next time you are urinating. Contract and hold the muscles repeatedly for some times daily.

Hope this can help.