If you're going to work your chest, I really recommend adding swimming to your workout regimen once in a while to help stretch those muscles out. Additionally, learning some "chest opener" yoga moves will help with that as well--there are also yoga poses specifically meant to strengthen the chest area. Take a look here:
Yoga Journal - Poses: Anatomical Focus - Chest
Yes, you can pull a pec, and it hurts, so be careful.