During the summer, my balls hang low and I can swing them while j/o or fucking. However, during the winter, my balls tighten up and don't hang as much. I discovered how good lowhangers were when I started the Iron Balls Technique in the martial arts. I saw that sifu had lowhangers and much resistance to kicks to the nuts so I decided to try this myself. My nutsack stretched while I was doing this routine and I no longer felt pain I otherwise would have felt if my nuts were held in place but my nuts were more free to move around to dodge the blow.
The pics I posted were taken during the winter so they are tighter. You can see that the ballskin is all bunched up but I will take some pics during the warmer months. My apartment has no heat so it is constantly cold (something I complain about ot my landlord). | 
