Hi pnearn,

One plane swing refers to swinging the arms around the body. The arms and the body swing on the same plane - hence one plane.

In a regular (classic) swing, the body goes around, and the arms go up and down.

The One Plane Swing means that you'll be 'flat and laid off' compared to the Two Plane Swing - but it isn't wrong, it's just how the 1PS works.

One big key to the One Plane Swing is, as you know, keeping that left arm connected. I'd say 'carry on!'

If someone says you have the perfect One Plane Swing, then you must be doing it right!

__________________
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I say it too often: If it's golf club shaped, you can play with it.

For the record, I'm a club doctor, not a swing doctor.