My penis and testicles shrink to almost child size proportions while exercising

Tust me this is natural!!

it is the bodys way of protecting you reproductive system.It is natural for it to retract during exersise because of all the rough motions that take place expecialy when running. your penis gets smaller because your body sends the wanted blood to your muscles and after exersising it may take around 30 minutes to grow back to it natual size.

so don't worry if this happens you will be back to yourusual self soon enough.

Does anyone experience penis/scrotum shrinkage when holding in bowel movements or pee? this happens to me, but it didn't always do this. It used to hang all the time no matter what i was doing.

It has to be some kind of muscular issue, but i just don't know what can be done to fix it.

I use to have have this problem... Key word "use to".  There is a remedy, but.. I will start off by saying that not all are up to the task.
Let's go back a few years..   I use to never have this problem... or at least, not to this extent.. and then, over the course of a year or so when I hit the age of 29,30.. It got me. I would be working out.. and in between sets, I would be having my hand down my pants pulling that bastard out again. It is not an infection or inflammation. That is a bulshit lie. I know because that is the lie I have told so many young men, and older men that come into my office. You would be surprised how many of you are out there. You are probably asking yourself, "Why would this guy lie to his patients?"..   The reason for that, is because I, or other MD's, do not want to be held liable for what I tell you in accordance with what must be done to fix this little bug (so to speak). A few men in here were right.. it is from blood going to the pumped parts of the body. For instance, leg press. The quads are the biggest muscles in the body.. they can take up a lot blood when they need to.. same goes for the abdominal muscles.. and so forth. The bigger your muscles are, the more blood they are going to take. Now, the answer you have all been waiting for.. How do I fix this. It's called blood doping. For those who don't know what blood doping is, it's when you donate blood...  to yourself! lol .. hahaha.. i love that part. anyway. You take the blood out, preserve it.. wait 48 hours.. warm it back up (NOT IN A MICROWAVE) to 98.6.. and run an I.V. back into your system. The more blood you have..  the better. If you need help on how to do this..  you'll have to research it yourself. You can buy everything you need off the internet. And you didn't hear this from me. All the information I have given in this statement is for entertainment purposes only. Have a wonderful day...   and better yet, now you can have a wonderful workout too. AANNNDD... , Now you can enjoy the 'bigger' side of life.

your MD., Me.

I am so glad I am not the only one with this condition. You guys should not feel bad... This condition happens to me too.   I have been playing basketball for 10 yrs now and workout often and like all people after a workout, I too shower at the gym.  The showers at my gym are a community shower, meaning that 20 to 30 people are in one large shower at the same time.  It is very embarrassing and humiliating getting a shower or changing at the gym. I notice that people a shocked to see such a small penis on such a tall and large man.  Is it normally to be this size after a physical exercise??? Here is my problem. Not only do I have a small penis after a workout, but I am a African American man; I stand 6'10" tall and about 260 - 270 pounds with a average - muscular body type. I want you to remember that I am not an average size man, in that I stand 6'10" tall 260 - 270 lbs, but my penis when in the flaccid state after a workout or basketball game can get as small as 0.5 to 1 inch long.  A penis this size is pathetic looking on a man of my stature.  I don't even think it would look good on an average size man of 5'6" to 6'0" tall to have a 0.5 - 1 inch penis.  Picture this for one moment if you could?  You just finished watching me dominate the basketball court and dunk like Lebron James and now we are all in the gym shower.  One look at me with my condition and most guys fight back the laughter in fear of me kick’in their ass.  I still get a little respect due to my overall size, but I am sure these guys have a lot less respect for me after seeing me in the shower and I am sure they run home to their wifes/girlfriends to tell them about the size of my penis.  To make matter worse, my normal penis size when it is in its flaccid state is only 2.5 - 3 inch and about 6 – 6.5 inches when fully erect, but know body gets to sees this. This is what I live with and have been living with for years now.  I am happy with my erect size, but not my flaccid size. I try not to let it bother me.     

How would a person take muscle relaxers and then go on a run?

Probably because you're cold, it's to protect sperm.

bigman, I feel your pain. I think it's impressive that you can just not let it bother you. I however, just can't let it go. It is so embarassing for me that I won't even undress if front of my wife anymore. We still have a good sex life (for someone in their 40's) but I need to take some time to work on Mr. Johnson before getting into the bedroom so I won't be so embarassed in front of my wife. I somehow feel like less of a man the older I get because of this condition. Too embarassed to even let a doctor examine me.

Yes. I hope everyone that needs the help reads this. I had this problem most of my life. It's not about cold and all the other stupid posts on here. Some of you came close. And why a woman was trying to explain what was going on with our penises I have no idea although her heart was in the right place. The good news is I have the solution.
What the men on here are suffering from is GAD and IBScombined. Generalized anxiety disorder and irritable bowel syndrome. There is a drug designed just for this and your penis and tedticles will be hanging freely again. The drug is librax. It is a combination diazepam and anti spasmodic that works directly on your lower abdomen. It is mon addictive and a long term drug. No man should have to go through what I have been through. The best part is you don't even have to mention your penis or testicles to your doc. Just say you have anxiety and your lower abdomen hurts and you have heard a lot about a drug called librax. The net has helped me so much this is my contribution. Peace guys.

I love the "it's normal" responses here.  Guys, we're not talking about the normal cold-water shrinkage that everybody gets.  We're talking about severe shrinkage to the point where it almost disappears.  

prostatic congestion due to sitting long time or riding bikes or constipation or long sexual excitment without ejaculation
the treatment is
1)avoid the reason if you are suffer from constipation take lactlouse
2)take natural supplement we call it in our country pepon plus its (Saw palmetto oil + Pumpkin seed oil + Zinc sulphate) it sold under different  brand names

Maybe you are only half a man... JK

Why would muscle relaxers help with penis size?

Testing this to see

go into the Sauna, then take a hot shower! I get this all the time its perfectly natural. Theres a reason they have saunas at the gym. Don't be ashamed brother.

If I had to guess, I`d say it`s because your body is routing your blood (the sh*t that makes your anything anything) to your other parts of the body