Running, especially high-intensity sprints, can boost testosterone levels, improving men's muscle growth, mood, and overall health. Moderate running can boost testosterone levels, but excessive long-distance running may lower testosterone due to increased stress and fatigue. Cardio boosts testosterone by improving blood flow and reducing stress, while oral testosterone treatment can further optimize hormone levels and health. Oral testosterone treatment is used to manage low testosterone levels.

https://www.rethinktestosterone.com/blog/running-and-testosterone