Hey is testical shrinkage normal when you do things like running and weight lifting? I have not taken steroids yet, but am planning on in the future. My testies just get tight when I run and lift hard core and im worndering why. It only happens when i do something that is inteans. I was thinking that the reasen for this happening is that my body starts to produce more testosterone when I do these things but im not sure. Because, ive heard that testical shrinkage is because of low testosterone.