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It is also easy to have fluctuations one day due to what you did the day prior.
If your body is still tired and you run again, you will likely run a little slower. But that doesn't mean the run isn't good for you because it is, you will still get the cardio benefits and fatigue forces you to rely on slightly different muscles.
If you take a day off and then do the same run again, you will probably run your personal record for that run.
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"Socialism is a philosophy of failure, the creed of ignorance, and the gospel of envy, its inherent virtue is the equal sharing of misery." - Winston Churchill
"All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act out their dream with open eyes, to make it possible." Seven Pillars of Wisdom, T.E. Lawrence
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