There and back again

On Sunday I ran 50km. I’ve got a route that I have done before, with the goal to try and do 6 minute kilometres for as long as possible. This time I got to 35km before I had to slow down. Maybe I could have kept it up, but I needed to stop for water, and my knee was starting to bother me. So the last 15km was at a much slower pace.
By Monday afternoon, my back was in a lot of pain.
Was it because I pushed myself too hard. Maybe it was because in the evening I had to move my barbecue indoors by myself. Could I have knocked my spine out of alignment?
It wasn’t until today that I think I figured it out.
My run was almost entirely on pavement. And I was wearing some shoes that I hadn’t used on a really long distance before. They have a fairly minimal sole. I’m guessing the lack of padding was causing stress I didn’t normally have.
Well, my back is getting better. So we’ll see how I feel tomorrow.
Tomorrow, where I have been thinking of doing a run in foot gloves.

I really don’t learn my lessons, do I?