This thread is about 6 years old, but the advice is sage and timeless. If you really want to improve your triathlon running, forget about swimming and biking for awhile and focus on running. 50 miles per week is enough to challenge a reasonably fit person around here and way more than enough to improve......which is the point. The only thing I would add is to seriously focus on nutrition and recovery (for the average person) once you are north of 40 miles running per week.

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