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Here's another tip inspired by a quote from legendary UCLA basketball coach John Wooden, who died in June 2010 at age 99:
"Things turn out best for the people who make the best of the way things turn out."
To me, this translates into the following marathon training tip: If your planned training run doesn't go as planned, don't beat yourself up about it, and don't give up. One run when you felt tired, ran slower, or bagged your speed workout in favor of a steady run does not mean that your marathon is doomed. Much of marathon training is just getting the miles in--you don't have to hit a magic number on a heart rate monitor to benefit from a 5-mile run, not in my experience. So don't get discouraged if (and when) you tweak your training plans. Instead, make the best of it--you got your miles in, and that's what will help you as much as anything on marathon day.