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

you have a hernia in lower abdomen

I have the same problem and my doctor thought it was a hernia but it turned out to be caused by drug use (pot speed etc) and medications my doctor gave me and I started damaging the tissue of my penis because I masturbated too often and too rough. Over the years all the abuse caused all parts of my body to heal poorly (neck back knees etc) and I had finally quit drugs and seen a doctor regularly. By the time I saw that my penis was already around 4 inches I was too ashamed to seek medical help. My genitals are now the size scale of less than a 1 year old (it's smaller than my brother's 18 month old). The only option given to me was a penis implant but it seems like a waste of money because I no longer get erect.

It certainly helps me! Being an extremely indulgent crossdresser I love being able to make my disgusting male stuff dissappear entirely when I slip into a pair of pantyhose. When I cross my hairless legs I do not care to feel ANYTHING between them! I shall practice working my cremaster and begin wearing painfully tight panties at all times, immediately! Thank you! I just might now change my username to: Girlishlyflatinfront

Can I take steroids to shrink my balls but not build any muscles. Having no visible arm and upper body muscles makes me look my most girlishly feminine in a strapless gown but I love the idea of making my balls shrink and dissappear inside my lower abdomen.

I can hide all my genitals behind a silver dollar, I never thought anyone would want to be my size.

Yeah I am having the same problem as well my penis retracts into my body and my scrotum shrinks as well. 

Maybe you just have a small penis?

hi i have to do this all the time!!!!!!! im at my wits end ,and I cant get a "hard on"????? its totally embaresing,even ,I struggle to have sex!!!!! semi hard on.anyone help me with this ???? im really feeling completely down,and its getting worse

if it is any consolation to you, i am envious of you! my greatest joy in life is crossdressing, self-feminization and sissification...i also happen to actually enjoy, in an erotic way, the deep dull ache of minor testicular trauma and if i could have everything my way at the snap of my fingers i would never get hard and have only limp flaccid orgasms, have my testicles and penis dissappear inside me at will, have my testicles constantly ache at the lowest level of pain and eventually shrink and atrophy down to a size no larger than single green peas...fortunately my penis is already so small, even when hard that no more than two fingers may be employed in pleasuring it. much to my delight i have made great progress toward making a reality of all the above thanks to the wondrously feminizing effects of estrogen and exquisitely emasculating effects of anti-androgens.

I would guess it has to do with blood flow. Your body is pumping the blood to your muscles in your legs and muscles involved in running... not your penis.

Also you are looking at your penis from an exextremely high angle. High angles make the subject look week. Look from a low angle and things look bigger and more in charge!

Wow!  I'm so happy I used Google to search my problem out and stumbled across this forum.  I had the impression that I was the only person this (penis retraction) was happening to.  I haven't talked to my doctor about this because the embarassment is to great of a feeling for me to overcome.  Just glad I'm not the only one, I guess this sort of thing is normal.  

I have this same problem although it doesn't really bother me as such, I was more curious to find out if it 'was just me'. As it definitely only occurs after exercise, I am fairly happy with the answers given here. Thanks

The problem sounds like you have a hypertonic Pelvic Floor which can be caused by exercise. 

To fix this you need to learn how to relax the pelvic floor through breathing. You may start to notice you are constantly holding your pelvic floor in a tense state and the beginning of the problem.

A good way to stretch the pelvic floor is by squatting. Sitting in a deep squat for 5 minutes will help stretch it out. It won't be fixed overnight! depending on how long you have had the problem, the longer it will take to get it to fully relax.

remember breath and stretch. Heaps of info on the web

Like one guy said before I believe its caused because your body diverts blood flow to the places it needs it most. Like sometimes when I've been running alot I can feel my arms kind of tingling because my body isn't supplying as much blood to them. It makes sense to me, your penis needs more blood to be erect so if it has less than normal blood flow it shrinks. Another example is when its cold outside your penis shrinks because your body is diverting blood flow to other parts of your body that need it more to help conserve body heat.