Pain with Gain?

Week 3 of Boot Camp! I missed Week 2, due to the cruise. But I'm back at it. Thankfully, last week I did not gain any weight. This week was tough though. Monday we ran...a lot! I did not do very well running. I consulted with Tdawg. I talked him into watching me and he corrected my form. So running on my own Tuesday was not as bad. Wednesday we were in the gym with free weights. I can only do 5 pounds, per hand. My shoulder screams too much with 8 right now. But I'm working my way up. I am in pain, so I'm hoping there is some gain to it. It is Thursday...I'm think I will just walk and stretch today. Whew!