Risks and limits of Cortisol Training

The concept of 'Cortisol Training' lacks a clear scientific definition. Cortisol is a key stress hormone that naturally fluctuates (e.g., circadian rhythm, acute stress). Approaches claiming to specifically lower or raise cortisol through targeted exercises or breathing techniques often lack robust evidence. Acute effects of exercise on cortisol are well-documented: intense exertion increases cortisol, while moderate activity can help regulate stress responses. Long-term, regular endurance training may lower basal cortisol secretion, but this is not an isolated 'training' of the hormone. Risks include potential dysregulation from extreme protocols (e.g., chronic overtraining, fasting, or supplements), which could lead to immunosuppression or adrenal fatigue. The overall evidence is weak, and individual factors (genetics, sleep, nutrition) play a major role. Without medical supervision, such training is not recommended.