I had a mild headache when I started.  Within the first 30 seconds my headache went away.  Then I felt this expanding feeling in my upper body first.  My awareness of my surroundings became sharp/clear and brought a deep calm to me.  Then my lower body lit up and became very relaxed.  This may sound strange but it softened my knees. (they’ve been demanding attention lately)   The birds singing are such a Great Addition.  I know the first one had the birds also, and there’s something very uplifting and healing at the same time.