This podcast episode explores the concept of overtraining syndrome (OTS) and its effects on endurance athletes. It discusses the challenges and complexity of both OTS and the biathlon sport. The episode also highlights the importance of individualized training plans, mental well-being, and recognizing the signs of OTS. It delves into the cycle of self-reinforcing behavior and the role of external stresses in the development of OTS. Additionally, it discusses the potential role of GDF-15 as a marker for OTS and shares the experiences of an athlete who faced OTS. The episode emphasizes the need for balance, recovery, and prioritizing overall well-being in sports.