Running and Relaxation

I received this quote the other day from Runner's World:

Running is a form of relaxation. 
That's one of the curiosities of life - that such a high-energy activity could be so relaxing.  
~Lee C. Bollinger, President of Columbia University 

Do you ever feel that way?  You're out running, pushing hard, but you feel yourself relax.  I think running is a great stress reliever!  I've laughed, cried, problem solved, and prayed all while out on a good run.  I can't run away from problems, but I've come home lighter and happier by running my problems away!