I believe Dr. Galpin said, rather casually, that if he saw one blood marker above a certain level, that's all he needed to know that the person was fit. It wasn't the typical Galpin multi-faceted answer, but I forgot what that marker was, and what the level was. I tried to search through his six part series but couldn't find it. Was it Hemoglobin? It was something relatively straightforward. By the way, I'm a big fan of the work you do, your approach, and your humility. Eunu Chun
What mechanisms does testosterone and AAS take in the brain to affect things like drive, confidence, anxiety, happiness, satisfaction, sense of well-being? What about growth hormone? Does it make someone feel younger by having higher levels? Does testosterone affect the brain in such a way that that an individual thinks and feels like they can build more musle therefore creating a physical response similar to a placebo effect? Any other interesting information you can provide?