Cortisol, often referred to as the stress hormone, significantly impacts physical fitness. While it plays a role in regulating metabolism, prolonged elevated cortisol levels can impair muscle recovery and hinder performance. Chronic stress can lead to muscle breakdown, making it more challenging to maintain strength and body composition. It may also contribute to fat accumulation, particularly around the abdomen. Understanding cortisol's effects encourages individuals to manage stress through relaxation techniques, optimizing their training results and overall health while promoting recovery.