This is almost my first post but I’ve lurked here for a while. Turtling has a few possible causes. One of which is your dicks response to trauma. Masturbation after your workout can also amplify the problem. When I want to make sure I don’t turtle, I will put a band-aid bandage around my cock just below the head. This keeps the head from being able to slide back under the skin. I’ve read on here that it should be a goal to keep your dick from turtling. I would guess that it allows the tissues to shrink back to their original size more easily. I’m sure someone more experienced than I am can speak up.
J