Level your shoulders to stop hitting behind chips
The instructor says putting the ball too far forward makes it easy to drop into a low right shoulder, which leads to hitting behind the ball. He wants the shoulders leveled out at address, because level shoulders make you less likely to hit behind the ball on a chip.
Channel: Dan Grieve
Watch official source at 2:35Why this context matters
Paired with the ball-position fix; leveling counters the low right shoulder that back ball position can create.