Too much of a good thing is not a good thing. Sitting may feel relaxing and fine, but if you sit too long, it may cause problems.
Let’s say this is a vertebra, and inside the vertebra is disc material. When you sit with compression and flexion—and I’m not really concerned with how good your posture is—you will eventually flex your spine if you sit long enough. What happens is the nucleus starts to worm its way through the inner collagen fibers around your disc and it hits a nerve, and BAM! You’ve got pain. In fact, the nucleus of the disk is treated by the body as a foreign invader. It doesn’t know what it is. You actually don’t even have nerve roots that can feel low back pain until that happens.
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