RunnerDude’s Blog: Hitting the Training Wall? Many half or full marathoners can attest to hitting a wall of self-doubt that smacks them in the face about halfway through their training.For first-time half marathoners it’s often around mile nine. For first-time marathoners it’s often around mile 15, 16, or 17.Things are going just dandy in their training  and then all of the sudden, they have a tough run and reality smacks them in the face. “Oh my God! That was hard!”…