[spike]

For someone trying this exercise for the first time they will find that even with extensor action applied, the 'passive left arm' tends to bend at the left elbow.

The difference in the golf swing is that there is a pulling action between extensor action and the left shoulder as the body pivot lags the hands, so the left arm is being pulled at both ends, preventing any bending of the left elbow.

The exercise could be modified to include a left elbow locked in place to prevent itself from bending but this would send the wrong message to the brain.

Thank you both. RFT is clear for me now, yea!!

This discription is clearly a "pulling" action.

What would happen to the left arm in the above drill (hands more belt height) if you "pushed" the left wrist away from the center of the body with the right thumb and forefinger? I find that the left arm raises and extends eliminating any left elbow bend.