Triathlon training can positively affect health and fitness. But men should be aware of warning signs and symptoms that can occur when your energy expenditure exceeds your nutritional intake. Expert nutritionist Dr. Krista Austin outlines how REDs (Relative Energy Deficiency in sport) and LowT (low testosterone levels) can impact reproductive, psychological, and bone health. Ironman Champion and Director of Endurance Sports at the UCAN Company, Matt Bach, also shares his personal experiences with low energy availability and overtraining. Dr. Austin provides recommendations for assessing your health and what to do if you recognize some of these symptoms in your own training.