Tweeked back

I don't know what I was thinking, but for some reason, I thought I should carry both kids (at the same time) up 2 flights of stairs. Well it's no wonder that I tweeked my back. I'm feeling better today, but yesterday I couldn't move at all. It was pretty pathetic actually. Luckily both kids were really good. Henry took care of me and his sister, and Natalie actually was very independent. I laid on the futon in their play room most of the day, with a heating pad on my back, watching movies. Henry and Natalie both played quietly. It was amazing. Why can't they do that when I'm not laid up?