Body is creaking

I know, I shouldn't say I'm dreading tomorrow, but I am. I'm considering starting at 4 or 430 to beat some of the heat but I'm not sure which is worse--getting up in the middle of the night or running in temps over 80. And, my back is killing me today. Got up and took 1/4 of a muscle relaxant and went back to sleep for a few minutes but still hurts. Couldn't figure out what made it happen until I remembered what I did yesterday. Went to temple to drive Meals on Wheels and had a few minutes to spare. A friend of mine was there tutoring someone in Hebrew and her precious baby was there, too. I held her for about 15 minutes, and I'm a little out of shape for holding plump little 9 month olds. I can't think of anything else that could have cranked this up. I hope it feels better by tomorrow or maybe I'll have an excuse not to do it! But, I can't do the 20 miler with you guys because of the wedding. Anyone else want to run 20 miles on the Monday or Tuesday after the 25th????