I agree with Archimedes - the impact of miles of running inherent in marathon training is hard on the body, and it is important to takes days off for your body to recover and get stronger,and for your performance to improve.
I think it helps to think (and refer) to them as "Recovery Days", rather than "Slacker Days".
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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