I threw my back out.  Holy mother.  Not a pinch but an entire muscle group.

Feeling older by the second!

and I don't even have a good story to tell for the reason – just one second was fine, the next second, invalid.  I think I was making the bed.  That's it, no more housekeeping.

Why does something like this always happen right around the time I find I am motivated to work out?? 

Karmic Workout Revenge.