Yoga time is my time.  I can completely tune out.  While I am on the mat, I know that I cannot change anything in my life.  Any thoughts which flutter in will have to wait, and as is life, nearly always can.  All I need do is breathe and focus on my body, as it gently changes shape.
 
Yoga is a moving meditation.  It is my way of taking the focus away from the ever-changing high pressure World, and finding the stillness of mind required to reassess situations from a positive stance.
 
Also, if I can still be moving and breathing in some of the poses when I am as old as other Yogi’s in the world, I will rest content.