Sometimes you fully intend to take the day off from exercise, but then the evening rolls around, and you realize that taking the day off is for sissies.
It wasn't a comprehensive workout. I didn't have time for cardio. But today is traditionally tricep-and-shoulder day, and I successfully came through, even if at the eleventh hour. (Okay, the eighth hour.)
Eight varieties each of push-ups and abdominal exercises. It's not the best workout I've ever had, but it is much, much better than the workout I was going to have otherwise.