As we continue our Grand Canyon Rim Running theme, two more obstacle course racing (OCR) athletes are heading out there this weekend for the Rim-to-Rim-to-Rim (R2R2R) challenge. Charles MacDonald and Jessica Hodsdon have been taking part in OCR since 2012 and 2015 respectively. That’s 21 combined years of OCR!?!? We may need to look up…