Traditionally the golfer at setup is a 2 plane machine. The arms hang from the shoulders on a fairly vertical plane and the club hangs from the hands on a flatter plane.
A recent popular training aid is the "tour angle 144". This device places the hinge angle of the club shaft to the forearms at 144 degrees. So the grip end of the shaft points to the belt line and the forearms point to the arm pit.
The greatest ball striker to ever play golf, Moe Norman, felt there was a better way. Put the shaft and the arms on the same plane. One straight line from the ground to the shoulders. The golf shaft running parallel to the bottom of the forearms.
From this position he moved the club with his arms, not with a complicated one piece rotary takeaway lead by the body.
Conventional golf is a body generated arm movement....The body moves the arms. Single plane is an arm generated body movement...The arms swing and the body follows. The following link to a youtube video gives a great view of the difference between a conventional swing and the single plane swing. Let me know what you think.
BTW I am a single plane golfer.
