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4:20 Marathon
Day 056 - Increasing your efficiency
5 to 6 1-mile repeats (13 miles total) 
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FOR TODAY'S WORKOUT RUN 5-6 ONE-MILE REPEATS (13 miles total): Mile repeats force your legs and feet to become more efficient by reducing or eliminating extraneous motions and getting the most efficient "lift-off" from each step.
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