Muscle tension and emotional stress... think about it.

"The repression of physical and emotional stress relies, in part, on muscle tension, from the head to the feet - tension that usually has been present so long people don't realize it exists, in the same way people adapt to background sound and don't even notice it is there." Fehmi -- The Symphony in the Brain - Jim Robbins

In the 8 week practice course, we Practice to elicit alpha brain waves, these brain waves enable the physical body to let go of the background tension, relieving stress. ~ Eric