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> If you are sitting, it's best to use the chair back to support your back so you can recline in a 135 degrees.

This idea is supported by a study that focused only on the volunteers' backs, not their necks, shoulders, etc.

Standing still is sub-optimal. But that's why treadmills are better - you're exercising and building muscle and that helps back pain.

The tide is probably turning against that opinion: the aches and pains are not due to the body doing too much, but too little.