The ultramarathoner Avery Collins, among the fastest in the world, is not shy about appearing in photographs holding a bong. The first time he tried running after using marijuana, he said, he realized “it allowed me to be very present and not to worry as much about overall times and what’s going on with the run.”
Mr. Collins, a 25-year-old from Colorado Springs, is one of a likely legion of athletes who use marijuana as part of their training — although he’s one of the few fast enough to get an endorsement deal from an edibles company.