Back pain is a huge problem in developed nations worldwide. It has or will affect most of us. The current estimate is that 80% of people will experience back pain at least once. It is the single biggest cause for disability, the third most common reason for doctor visits, and one of the most common reasons for missing work. It's also expensive. Back and neck pain makes up the biggest healthcare expense in the US, totaling $134 billion spent in 2016. The next two most expensiv