This is a great stretch to do before you do your Tuff Mutha training run or strength workout.  http://youtu.be/_0sqSiAEJvg It also happens to be part of my 12-week Tuff Mutha Adventure-Race training program. The picture is just there to scare you. I am training individuals in a small group for Tough Mudder Norcal April 12th 2014…