miles 10 miles 5 10 x 400m 5 miles 14 miles 6 5 x 1200m 5 miles 15 miles 7 7 x 800m 8 miles 17 miles 8 3 x 1600m 10 miles 13 miles 9 12 x 400m 3 miles 18 miles

’s trying to make it around the block four times, as well as the 36-minute 10K runner who’s training for a first marathon with long runs that stretch to 12 miles, then 16, then 20.The gradual-adaptation principle is deeply rooted in human physiology, and has

to all circumstances and all runners – the beginner who’s trying to make it around the block four times, as well as the 36-minute 10K runner who’s training for a first marathon with long runs that stretch to 12 miles, then 16, then 20.The gradual

training for their first marathon, the long run might start in the 10- or 12-mile range and gradually progress over several months to distances approaching 20 miles.Also, some race experience at the 10-mile and half-marathon distances can serve as dress

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