![Ryan on Twitter: "Common side effects of marathon running and prolonged endurance activity • Physical exhaustion • Low testosterone levels • Cortisol addiction • Kidney damage • Inflammation Marathon Runner vs Sprinter Ryan on Twitter: "Common side effects of marathon running and prolonged endurance activity • Physical exhaustion • Low testosterone levels • Cortisol addiction • Kidney damage • Inflammation Marathon Runner vs Sprinter](https://pbs.twimg.com/media/Et4rKRmWgAAp-H5.jpg)
Ryan on Twitter: "Common side effects of marathon running and prolonged endurance activity • Physical exhaustion • Low testosterone levels • Cortisol addiction • Kidney damage • Inflammation Marathon Runner vs Sprinter
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The Sprinter and the Marathoner: A Tale of Two Workout Routines | HIIT Academy | HIIT Workouts | HIIT Workouts For Men | HIIT Workouts For Women | HIIT Training
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