For many of us, running a half marathon would be a lofty goal. For Heather Lee, it’s merely a third of the triathlon she’s currently training for. A competitive triathlete, Heather—a 33-year-old living in Brooklyn— is training to go to Campeche, Mexico, in March 2018 for the half Ironman. That’s a 1.2-mile swim, 56-mile bike ride and 13.1 mile run, in that order. To date, Heather has competed in 12 triathlons, including one full Ironman in 2017.