Sometime during the midst of drawing today's strip last night, my left trapezius started to hurt down near the bottom where it connects to the spine. Then as I was coloring and the evening wore on, the pain grew steadily worse, until by the time I went to bed it was making it difficult to stand up and walk around. Owie! >.<
So today, no workout. I rest.
I'm assuming that it was put into "the danger zone" by the increased weight on the rope pushdowns, and then leaning over the drawing table to ink pushed it over the edge.