Ow.

Working to retrain my posture means I have a bunch of muscles going "what the hell, you never made me do that before." But I much prefer this discomfort to the "don't even think of moving properly" pain of a herniated disc. But trying to hip-hinge with tight hamstrings, ow >_<.

Highly recommend this book, by the way. For people who've had back problems and also for those of us who were simply never taught proper posture (i.e., most of the industrialized world). It focuses on how our bodies are supposed to work.