The GFR is via his rear sitting on the chair and the chair sitting on the ground.
@ shawn is the chair moving at all when you do the movement?
Is the chair anchored?
Bobby you really need to look into Biotensegrity...... we are much more than just Fulcrums & Levers.
Edit: You seem to be a smart person...... it may change your whole way of thinking about this stuff.
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