Hey Jake, you're right that after prostate removal penile shortening often reverses on its own within 6 to 12 months.

@songwriterdanny, kudos on using exercising during your recovery and for your health. Experts aren’t sure why the penis shortens after prostatectomy. One possible cause is abnormal muscle contractions in a man’s groin that pull the penis farther into their body. Perhaps exercising has helped release groin muscle contraction. I couldn't say. But what I do know is that exercise is good for you. What type of activity to like the best?