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The shoes that serve you well when training for and running 10K races probably aren't adequate for the marathon. The marathon puts much greater stress on both runner and running shoes than shorter races.
Your long distance running shoes should provide greater cushioning than the shoes you wear for shorter training and races. The force exerted on your legs at each footfall is greater than twice your body weight. Only greater cushioning can help prevent damage to your ankles and knees – and keep you in the race for the long run.