For whatever reason, I've been all "Oh, I'm just going to go to yoga and not do anything else on my birthday." But then I realize I barely got in a workout yesterday because I got awful craps while on the elliptical machine and I have plans with [The Boy I Currently Like] on Thursday so I'm skipping the gym that night.
At this point, I might as well say "screw it" to the entire week. I'd be down with tomorrow if you want.
I would say that the onset of "awful craps" would be just as valid a reason to cut your workout short as "awful cramps," which is what I actually had. I doubt I would find the idea of "awful craps" as hilarious as I do if I'd actually experienced them at the gym.
(Now I keep typing "cramps" even when I'm trying to type "craps." TOO LITTLE, TOO LATE, BRAIN.)