zmx,
Fist welcome to the gym,
When exercising your penis it is the same as exercising another part of your body. When you first start you have to give it time to rest and grow. If you just keep working out it will never get time to rest and just eventually get weaker. As time goes on and your muscle grows you can work it out more but when first starting its just best to take it as slow as possible.
Also to your other question about your length when flaccid, Your penis size when flaccid changes all the time, It has to do with many things from the temperature, to how much water intake you have, or it could be if you just took a shower. So basically there is nothing to worry about. |