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I do need more PT, thank you!
Can you explain a little more upon how that works?
Sure. I’ll tell you what I understand, but I’d suggest checking what I say against Girard’s videos themselves.
Anyway, his approach involves supporting your lower back. In a way, it’s almost as if your chair’s back is exclusively there to support your lower back.
Notice that, in this approach, your upper back is not supported by your chair. That means that you have to engage your core and back muscles to support your upper back and your shoulders and head. That is why sitting for long can get tiring and at some point is simply impossible.
Depending on your chair, you might be able to easily lay back, almost as if your chair was a bed. This is fine if you are not typing or using your desk. But I think Girard generally favors the sitting up straight and using your muscles.