Deep breathing exercises enhance physical performance by improving oxygenation and promoting relaxation during stressful situations. Controlled breathing increases lung capacity and strengthens respiratory muscles, leading to more efficient oxygen exchange. This can result in increased stamina and reduced levels of perceived exertion during exercise. Additionally, deep breathing helps lower heart rate and cortisol levels, supporting a calm state of mind, which can enhance focus and performance. Incorporating these exercises into training routines can lead to improved overall fitness outcomes.