Dashing out of the gate too fast in a race always comes back to bite.  In a half-marathon or longer, the bite can be particularly nasty – it’s not called “hitting the wall” because it feels good.  Runners know this, but it’s difficult to reign in the pace amidst the excitement, adrenaline and invincible hope surrounding the start.  A well-practiced pace plan and GPS device are solutions.  Alternatively, a pacer can guide a runner through a steadily-paced race.  Many races provide pace leaders tasked with getting their pace group to the finish line in a specified time.  Pacers monitor the math minutiae required to maintain a steady pace and talk throughout the journey, providing encouragement and distraction from the pain.  My friend Margi has…