Quote Originally Posted by southpawed
When i throw rear hooks at the heavy bag, i get this feeling like im exerting my shoulder where it rotates. Which causes some pain dood. I dont know if its cause im landing with a horizontal fist or vertical fist or if its cause im too close to the bag? but now when i windmill my shoulder its sore and it cracks. But i've experienced this when i do inclined bench presses in the same exact area of my shoulder. Could it be that my rotator cuff is messed up? or could i just have weak shoulders?

http://en.wikipedia.org/wiki/Image:Shoulderjoint.PNG

the closest spot i can nail the pain is the rotator cuff.
Do you warm up properly before you train? need to see you throwing really. Like Scrap says you're probably throwing it wrong