Despite the prohibition, running on weed has become an increasingly popular trend among athletes, who use it either as a way to avoid fatigue, boredom or anxiety during long runs, or as a pain-reliever and anti-inflammatory medication during recovery periods. Ultramarathoner, Jenn Shelton, told the Wall Street Journal that she uses cannabis in her training, as does triathlete Clifford Drusinsky. And who could forget Arnold Schwarzenegger ripping a jointin the documentary Pumping Iron.