Exercise penis shrinking. Where do you think the blood for that sweet juicy post workout pump comes from? If you're not left with a tiny chipolata and two depressed acorns, you're not working hard enough I reckon. Your body is using your blood for muscles and heart function under exercise, thus taking some from your penis temporarily. Get an ad-free experience with special benefits, and directly support Reddit. Subscribe to our Daily news newsletter Enter email Subscribe. Skip to main content. The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants. The old meat and two veg will get smaller, as fatty deposits build up in the arteries and reduce blood flow. Get Fatherly In Your Inbox. Foreskin provides wonderful abrasion protection!