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Good response Mr. Daryl!!
Mr. Bennett practices, and occasionally gives some lessons near where I live. He is a very impressive ball striker himself. Some of thier info is from TGM and some for MORAD... and some from their research. Tom Scherrer was the most impressive of the students I saw him working with, and they have many.
There are obviously two choices here... Left or Right Leg... there must be a Pivotal Axis for the mechanics to work.
More discussion...
Pivotal Axis, There must be, I agree. Choices? Possibly. However; we can assess the value of a particular Procedure based on Mechanical Advantage.