Hi, Your podcast has changed the way I live and subsequently the quality of my life. Thank you. I live in Singapore. Many of your physical performance related episodes discuss training to HR, but I feel the impact of heat and humidity is underaddressed. I’m 55, and training in Singapore can add 10 bpm to my average HR during a run or bike. I’ve tested jogging a 10k in Singapore and six days later a 10k in Seattle while using the same pre run protocol: 10 bpm lower hr AND 30 seconds faster mile split. Similarly, I can easily hit my max HR in Singapore even though I am running or biking slower than I would elsewhere. I can only assume I put more effort into exercise in Singapore… with less gain. Or can I? I cannot escape the heat and humidity. How should I interpret my HR when training in what should be zones?. How should I adjust my training? Thanks for all your work. Mark