Push ups on your knuckles also helps your wrists, you can punch into a box of rice to toughen the knuckles.
You're going to have to grow a better tolerance for the pain, so all you can really do is keep on punching the heavy bag and try to ignore the pain.
Don't worry about strengthening your knuckles so much as much as wearing hand wraps.
You need to wrap your hands and glove them or your going to kill your hands.
Why should i teach you all the tricks of the trade?
I was punching a punching bag the her day and after hitting the bag as hard as I could, my knuckles just really started to hurt. I have weak knuckles overall and I would like to know how to strengthen them. please be specific. thankyou