[Mathew]

Why the left arm horizontal as a definition point?

If we are talking about the club being on plane, I would have expected the definition points, a more universal set, would be the club, not the left arm....

Yup totally agree here Martee

Infact stopping at any point on the backstroke or downstroke the club should be on a plane. Predefined points is position golf, geometrical alignments is alignment golf.

Interestingly leadbetters procedure is an underplane shoulder turn takeaway which then shifts to another steeper offplane plane that also passes between through two onplane planes at parallel...can't see the logic myself . Now on the downstroke he wants you to shift from that offplane plane to another offplane plane parallel above the hands only plane before getting to the elbow plane... ok then.....

I like what Moe Norman said about him "artificial strokes for artificial folks"....