Study says you shouldn’t sit up straight

globeandmail.com: Was Mom wrong? Study says you shouldn’t sit up straight
Defying the age-old advice of parents and teachers, a new study shows that you’re better off sitting back than sitting up.
An Alberta researcher has found that while seated, with feet flat on the ground, leaning back to create a 135-degree angle between the thighs and trunk is much less straining on the spine and will not lead to the potentially chronic back pain associated with sitting in an upright position for extended periods of time.