Traditional plans
Most training plans for marathons and half marathons have a variation of runs in any given week.
Training mileage is one of the greatest determining factors of performance and endurance in distance running.
From my personal experience, I propose another approach to allocating weekly mileage. Run the same distance and effort every day. This is the only approach that has helped me to increase mileage as a runner prone to inconsistency and injuries.
The math is too simple
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If you average 5 miles a day, that's 35 miles per week.
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If you average 8 miles a day, that's 56 miles per week.
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If you average 10 miles a day, that's 70 miles per week.
Why this works
This works for me because it maximizes the amount of recovery between runs and removes doubt about what I need to run every day.
Mixing it up sometimes
Sometimes it really is too boring to run the same distance and pace every day. I would add slight variation by running longer on Saturday and less on Sunday.
This is the simplest way to increase mileage, minimize injury risk, and maximize recovery potential.