This is known as spine tilt. Pro's have a spine tilt of ~8-10 degrees, while most amateurs have ~3 degrees or less.

Butch Harmon calls this setting up with the ball under your heart (RHG) - if you drew a line through your heart, it would stop @ the ground with your ball, and it would barely graze your ear going up. It's made a huge difference in my game, allowing for a better turn, and an easier time getting to the top. I find it also stops a hip slide, and helps in loading the right side.