We sit for too long, but do we sit correctly?

Prolonged static postures are the enemy. The healthy body can only tolerate staying in one position for about 20 minutes. That is why sitting on an aeroplane, at a desk in an office chair, or at a movie theatre becomes uncomfortable after a short time. Standing in one place, such as standing on a concrete floor at an assembly line for extended periods of time tends to cause back pain. Holding the same position slowly diminishes elasticity in the soft tissues (muscles, ligaments, and tendons in the back). Then, stress builds up and causes back discomfort and/or leg discomfort.
ADVICE: Whether you're sitting in an office chair or standing in a line, change positions frequently! Just move! Stand or sit, stretch, take a short walk. After returning to the standing or sitting posture, use an alternate posture for just a few moments and some of the tissue elasticity needed to protect the joints will return.