by Steven Wu
physics :mv = MV
thus :1.in 1ps,use only muscles to generate power which will cause "shearing force"on the shaft and clubhead, so that the M of the clubhead will increase.
in 2ps,only use shoulder cuffs to accelerate the speed (V) of the clubhead adopting "double pendulum "theory".
2.mentally,for 1ps, player shall only intend to increase the shearing force and push the ball toward the target somehow like a big putter.any thingking of speed up the clubhead will fail the swing.
In contrast,any attempt of forcing the shaft and head on the "shearing" direction will demolish the "round circle" of the clubhead locus. Thus, player shall only "intend" to speedup the velocity of the clubhead. within the shaft, most of the force occured is "pulling stress".
lists of the right muscles and order for both 1 and 2ps will listed next time.

by tom gallagher
I am confued about when and how to set wrist in the one plane swing.