A few miles from the finish line, this long-distance runner has stopped in agony to lean against the walls beneath Tower Bridge during th London Marathon, England. Pushing against the solid wall and stretching his cramped leg muscles, he grimaces in pain as other runners speed past on their way completing their personal race. Pushed to his limits, this man needs to continue a few more Kilometres to claim his medal and to claim victory. But he still has to overcome the pain of an overworked body. When glycogen runs low, the body must then burn stored fat for energy, which does not burn as readily. When this happens, the runner will experience dramatic fatigue. This is called "hitting the wall".
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