Have you ever played one note over and over again for 15min? Only pausing to breathe.

Things get trippy around 7min

If you do it with a drone on, you may start hearing other notes and overtones

Sometimes there are out of body moments or even whole minutes

Like you are observing yourself

More practically, Every micro tension in your body becomes a serious problem after a few minutes

This is a great way to find out where you hold your tension and make a plan to move toward balance

Set up my ErgoBone to help minimize tension, but it still accumulates in my mid/upper back

Gotta be some postural adjustment that could alleviate it