The marathon hat trick is a goal that some committed distance runners aim for but few have achieved. To accomplish this feat runners must complete 100 marathons, a marathon in all 50 U.S. states, and a marathon on all seven continents. Fewer than 60 runners have completed the marathon hat trick and only three of them are Black. Two of those three are from St. Louis: Tony Reed and Lisa Davis. A documentary, “We Are Distance Runners: The Marathon Hat Trick,” is about their story and it screens Wednesday evening as part of the St. Louis International Film Festival.