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Stuart McGill recommends periodically standing and stretching your arms over your head a couple times. You can see the motion demonstrated here: https://m.youtube.com/watch?v=bcbuhePZZj0&t=459s

He also recommended doing the cat-cow from yoga, and there's a set of exercises referred to as the McGill big 3.

I've seen some positive references to the McKenzie method book, Treat Your Own Back. I haven't tried it specifically, but had good luck with their equivalent book for neck treatment.