If you’ve read “Born to Run,” or have been inspired by a barefoot runner and want to learn how to run with light, quick steps off the ball of the foot (as opposed to thundering heel strikes that put a huge burden of sheer on the knee) and have decided to transition to a technique like Dr. Nicholas Romanov’s “Pose Method,” there is one piece of advice the likes of Brian MacKenzie will give you: Know that it’s going to take some patience as you adapt the tissues to the different stresses of a new foot strike.