| http://www.w3.org/ns/prov#value | - The researchers used a new form of magnetic resonance imaging (MRI) to show that sitting straight up places an unnecessary strain on your back....Eliminate back pain with the Swopper chair that promotes active sitting12/5/2004 - Back pain is a widespread problem in modern society, and a lot of that pain comes from, believe it or not, lack of exercise of skeletal muscles, lower back muscles, abdomi
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