My kudos go to Iso Yucra, a Potosino who excels in heavy-duty marathons! Follow two pieces of information: This Week In Running: January 3, 2017 by Justin Mock http://www.irunfar.com/2017/01/this-week-in-running-january-3-2017.html Now, Eju.tv reports: Bolivian Iso Yucra wins US ultramarathon He participated in the category 72 hours and in that time managed to cover 400.4 km. It…