Oh my Aching Back!

What did I do this morning that, has given my lower back a stabbing imp with a prod on bending over? I don't know. I should have done Yoga. I went for a run. Ah, well. Tomorrow I will do Yoga. And Practice the Guitar. And Paint a kitchen wall. And Clean. And. . . . Oh so many things I should have done today. Yes, I will get coffee filters and flour. Yes that too!