[Etzwane]

I'm sure someone with more anatomy knowledge can give more detail, but when I interlock the left forearm rotation is checked, it just doesn't want to roll.

I'm guessing it is in part due to activation of the muscles supporting the thumb and forefinger of the left hand (separate your index/middle finger in a 'V' as wide as you can to feel what I'm talking about.

Sorry I can't give you more, but at least for me the difference is clear.

Hello,

new to TGM and LBG... still diging out the wealth of information here !

A teaching pro told me that if you put pressure on the thumb and forfinger, this activate the muscles in the top of the forearm which restrict the pronation / supination. On the contrary, pressure on the last three finger activates muscles in the bottom of the forearm that do not interfere with pronation / supination.

Etzwane