What really confused me was the following tip: Try to avoid sitting in the same position for more than 30 minutes. So is there a correct sitting position? Or is the correct sitting position "sitting differently" every 30 minutes? Those are two mutually exclusive things.
Kelly Starret has a great quote about this: "your best position is your next position".
Which is really another way of staying that you should be moving and changing positions frequently. Sitting to standing, on a stool, one foot up, then the other, etc.
You can really run in to problems when you are sitting in the same horrible posture for hours on end. One side benefit of a standing desk is that it makes it a lot harder to stay in one position for hours because you can't slump back against a char. So you actively have to find ways to support your own weight, or at least you realize you are slumping forward in an awkward way onto the standing desk and you change position.
