Reachin, I'm in the same boat as you. My [words=http://fleshlight.sjv.io/c/348327/302851/4702]FL[/words] is 5" but when I excercis, I swear it shrinks to 2"....and my scrotum tightens up and draws my balls into my body. It makes changing and showering at the gym a stressful situation for me. I think a lot of guys have the oposite problem, when their body heats up, their stuff loosens up and hangs lower...but not me. I turn into an acorn.
One thing that I found that helps is a small amount of Cialis taken every day (witha few days off every now and then)...and by small, I mean 1/8 of a tab. I don't have ED, but this small amount on a regular basis seems to prevent the dramatic shrinkage and has the side benefit of enhancing my sex life.