Death by Moving

I packed a 47 pound box a few days ago. Not that it's a big box - it's medium sized, but it's full of textbooks and deceivingly heavy. But I figured it wasn't that bad. Then today I started taking some boxes over to my new place. I didn't get to that monster one, but the boxes I did move opened my eyes. These weren't heavy boxes, and I only had to climb 25 stairs with them, but it was really hard! I was sweating and out of breath and fearful about future moving efforts. What will I do with the heavy boxes of books? Moving will be the death of me. I'm going to have to try to repack some of those boxes to make them lighter. 'Cause I want to make it to the point where I enjoy living in my new place, not expire before that happens.