It's great that I'm shelving regularly at the library now. Works wonders for the muscles, spirit, and brain. Perfectly relaxing and good exercise at the same time - a lot of concentration but not much brainpower. A bit like tennis - or beading or coloring, but with more walking around and carrying things, reaching up and bending down.
Not to mention the library is a place to do deliciously nerdful things. Here is a place where I get to visit Star Trek websites without my brothers looking over my shoulder, read about everything from how human blood works to folk tales of the Hmong to the physical possibilities of time travel, and keep out of the thick Rhode Island heat. I love this place.