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A pro told me on the driving range today to keep my spine tilt.

This may sound odd but see if you follow me.

In a front on view, at the top of your backswing is spine tilt an angle drawn from your belt buckle up through your chin?

or

In a front on view at the top of your backswing is it from your front hip up your back to your shoulders. This would cause a large lean away from your target?

Pro - shmoo. I'd go with what feels good. If you're going to play in your state amateur championship, the exact technical stuff will make a difference. But to this old duffer, the golf swing has to feel smooth and rythmic. Then it'll work.

Spine tilt is both, it angles away from the target and tilted toward the ball. What the pro is telling you is that the spine tilt you have at address is changing during the swing. This happens if you are set up wrong and must move to hit the ball(what most good players do) or that your set up is good and when you move you miss hit the ball(what most bad players do if their set up is good).

I thought spine angle was the angle formed by your spine and your legs, if viewed from behind your swing? So if you a draw a line down the spine to the butt, and from the butt down the legs, that should be te spine angle, no?

You have TWO spine angles you need to maintain. One is the angle at which you bend over to reach the ball. You can see this angle by looking at the target from behind the ball. The second angle is the angle you lean to the right at address. This is due you having your right hand lower on the shaft than the left. This angle can be seen by looking at your address position looking at your back or chest. Both angles need to remain constant if you want to return the club head back to the ball with solid contact. I hope this answers your question.