I knew a distance coach named Bruce Sherman, a 2:34 marathoner at Boston in '84. He has run at least 1 mile a day for at least 39 years as of 2017 and is a member of the U.S. Running Streak Association. He's a masters-level runner.
(feel free to insert streaking jokes here).
https://www.runeveryday.com/news/archive/newsletterV17N2.pdf
Anyone familiar with this side of the arcane sport of distance running?