The purpose of the exercise was to help you establish doing something relatively simple: standing well and sensing your feet. This is a basic stance.
The roots are the tree’s foundation and your feet are yours. In order to create the correct playing stance, your feet must be securely under you. Your shoulder- horizon must remain supported by your body.
What did you learn?
The mental note you took while doing the exercise allowed you to learn how to intentionally create a relaxed, balanced physical state of poise and remember this “feel.” The feel of being at ease and balanced was registered while your eyes were closed, making it possible to recreate this feel whenever you are playing.
Becoming masterful at retrieving this “feel-mental-file,” will increase your sense of being poised and confident. This allows you to perform comfortably.
When sitting to play, the same physical need to be poised and well grounded is paramount.