Aching back Sitting up straight could be the culprit

But...No slouching! 

“We were not created to sit down for long hours, but somehow modern life requires the vast majority of the global population to work in a seated position,” Dr. Bashir said. “This made our search for the optimal sitting position all the more important.”
The researchers studied 22 healthy volunteers with no history of back pain or surgery. A “positional” MRI machine was used, which allows patients freedom of motion—such as sitting or standing—during imaging. Traditional scanners have required patients to lie flat, which may mask causes of pain that stem from different movements or postures.
The patients assumed three different sitting positions: a slouching position, in which the body is hunched forward (e.g., hunched over a desk or slouched over in front of a video game console); an upright 90-degree sitting position; and a “relaxed” position where the patient reclines backward 135 degrees while the feet remain on the floor. Measurements were taken of spinal angles and spinal disk height and movement across the different positions.

Source: Aching back Sitting up straight could be the culprit

 

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