And to my considerable surprise I don't ache (much) this morning. The head is still a little fuzzy and has the usual occasional pain, but I'm pleasantly surprised at how much better the bod feels than it did yesterday. If this carries on then I'll probably run 10k home tonight.
To be honest I'm not sure this exercise thing is all that great. It wants to become all-consuming, which isn't helpful if you just want to get on with life and the stuff you're called to do. We'll just have to make sure it's kept in proportion - and I'm sure the time to back off will come soon enough too.