So... had a couple cups of coffee, did some back stretches, and then sat down and did 200 sit ups.
I have met my goal. ("Hello Goal." "Hello Merry.")
Seems to me this calls for a gold star on the post and a 200 sit ups icon on the sidebar.
To review: when I did the initial 200 sit up test, I did 30 sit ups before my back started to hurt. Started this in April, stopped in July when I hurt my arm/shoulders, started back up a couple weeks ago and finished October 18. Not sure these dates are especially relevant except that they show that I kept exercising, apart from the injury/rest.