OK, I just started to get back to hittin the weights, OK....
So its not weights, It my Bowflex.

Actually I have both that and free weights, and I alternate.
But the problem is this. When using any type of excersise using my upper back( shoulders neck and upper back area) , like cable pulls, rowing, overhead press, etc....
I feel like there is a giant "knot" back there. Its really stiff, and feels like I am not as flexible as I should be on my upper back. I also get fatigued very quickly no matter what weight, and it tends to spasm after a few excersises, forcing me to quit working that part.
No other part of my body reacts the same, or has these problems when working out.
Any recomendations? I am starting a static stretching program, in hopes that it will help it out... If you have any explenations to why, or how to fix it, please let me know.
Thanks