"The spine is well sprung with resilient discs between the vertebrae and luckily, too. Otherwise, just one ordinary step would result in a minor concussion. The sacrum and coccyx cannot move but the 24 other vertebrae are connected by movable joints. Together they make a very elastic construction" - www.allscan.ca
Yeah. It can also hurt. A lot.Often for no apparent or obvious reason. Back pain is the second most common cause of long term sickness in the UK.
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