In training and on race day we are practicing Galloway walk breaks. On our long runs we walk after each mile. We walk fast for about a minute. Walking fast switches our muscle usage, segments the run, and gives the heart and respiratory system a rest. Brain endorphins also get released during walk breaks. In a walk break we are still moving forward, but the break pushes back the wall of fatigue and allows us the stamina to run hard in the last five miles of a marathon.