I think that's absolutely wrong to spell exercising with a "z". Not fair at all. I probably would have racked my brain forever and still not figured out what was wrong. Glad you got it!
I, too, am addicted. Part of me wishes that I had more time to spend on these puzzles, and part of me wishes that I never found this site in the first place.
You are the 100% queen by the way, and your solve time ain't too shabby! Kudos!