jim8flog
Journeyman Pro
Obviously that then opens up a discussion of what constitutes a swing.
That is easy it's in the definitions and rules
Stroke
The forward movement of the club made to strike the ball.
The rules do not define a backswing so it can be a very small movement but you are not allowed to hit the ball without moving the club back otherwise it constitutes a scrape. (assuming you do not start with the clubface back from the ball in the first place)
10.1a Fairly Striking the Ball
In making a stroke:
• The player must fairly strike at the ball with any part of the head of the club such
that there is only momentary contact between the club and the ball and must not
push, scrape or scoop the ball.