Which muscles are you stretching?

Here is a great article about stretching.

In this article from Make Your Life Healthier these pictures show you which muscles you are stretching.  It may not be specifically about Mountain Biking but it is something that can help make you a better rider.
http://makeyourlifehealthier.com/36-pictures-to-see-which-muscle-youre-stretching/

mtn stretch 2