Note
Ran trails at a very easy pace up top. Nice conditions--cool, some wind, mostly sunny. No problem tolerating the rib pain at the very easy pace I was running, but anything faster would have been a lot less fun. And core exercises at the end of the day--well, scratch that, and was just able to do the stretches.
As it looks like I won't be able to do any hard running for at least a bit, this is something of a setback. So it goes though, and I doubt it will take too much time before I can try running harder again.