Is There Such A Thing As Painter's Elbow?

I know that it is probably too early to start whining but owwee, my right arm hurts! I had no idea how out of shape I was painting-wise. I guess it is just like exercise; once you start a new routine you feel pain in muscles you never knew you had. I wonder if I can get workman's comp?

Today, I have continued working on those windows I keep going on about. They are coming out good so far. It looks like I am on track to finish this painting by my first deadline so I will not incur the wrath of my sister! I also got some new brushes today and they are delicious to work with.