If you’ve ever tried to run after work in Manila, Singapore, or Bangkok, you know the struggle: step outside at 6 p.m., and it feels like opening an oven. Temperature: 30°C. Humidity: 82%. Heart rate spike. Heavy legs. You’re not imagining it—heat and humidity are the silent performance killers for Asian triathletes. The run leg is where heat hits hardest. Swim and bike get some relief (cool water, airflow), but the run hits you hardest. Here’s how to train smarter, not harder. 1.