A common error amongst the amateur golfer is what is called a reverse pivot. This is when your spine angle from the face-on view starts leaning towards the target.
This can cause a number of issues such as poor balance, off-plane swings, weakened power and inconsistent ball striking. It’s important that we use the spine as an axis to rotate around and pivot with during the swing.
To help maintain your spine tilt, try taking some practice swings on an uphill lie. This will force the body to load the weight more into the trail side, and make it very difficult for your spine to start coming out of tilt.
You don’t necessarily need to hit golf shots with this drill; it’s more about creating a situation that will allow you to correctly understand how the body should be moving.