Fatigue in running can be characterized as exercise-induced fatigue, which is an involuntary decrease in the muscles' ability to produce force or a powerful contraction. It can result in physical exhaustion, sluggishness, low energy, and sleepiness during or after running. This type of fatigue can impact a runner's energy, strength, speed, and power, and may lead to a feeling of chronic sluggishness and exhaustion.

Fatigue can also be a result of overtraining, anemia, low iron levels, and accumulated stress. It is important to differentiate between exercise-induced fatigue and condition-related fatigue, which involves ongoing exhaustion and lethargy, and can be worsened by physical activity or mental stress. Understanding the signs of excessive running fatigue, such as unusual and persistent muscle soreness, difficulty recovering from runs, and significant performance plateaus or declines, can help runners identify when they may be dealing with excessive fatigue.

Recovery from running fatigue may involve limiting extra stressors, fueling the body wisely, focusing on sleep hygiene, prioritizing recovery, and reducing other stressors related to work or home life. It is essential to pay attention to the body's signals and take steps to prevent and manage fatigue to ensure a balanced and sustainable running routine.


  1. Types of Fatigue:
    • Physical Fatigue: This is when your muscles feel weak and tired, often due to depleted glycogen stores, which are the primary energy source for muscles during exercise. When glycogen runs low, your body shifts to burning fat, leading to quicker muscle fatigue and reduced efficiency.
    • Mental Fatigue: This involves feeling mentally drained or burnt out, impacting your focus on running. It can result from stress, anxiety, or a lack of motivation.
  2. Combatting Fatigue:
    • Proper Training: This includes adequate rest and recovery to prevent overtraining and chronic fatigue.
    • Nutrition and Hydration: Eating a balanced diet rich in carbohydrates, proteins, and healthy fats, and ensuring you're well-hydrated before, during, and after your runs, can significantly mitigate fatigue.
    • Mental Strategies: Employing positive thinking, visualization techniques, and setting realistic goals can help maintain focus and reduce the feeling of fatigue. Breaking down the run into smaller segments can also keep motivation up and make the distance seem less daunting.
  3. Listening to Your Body: Recognizing signs of fatigue like muscle weakness, mental exhaustion, or dizziness is crucial. If these symptoms appear, it's important to slow down or stop running to prevent injury. Sometimes, taking a break from running and allowing full recovery is necessary.

In summary, fatigue in running is manageable with balanced training, proper nutrition, hydration, and mental tactics. Being attuned to your body's signals is essential to prevent injuries and burnout, enabling you to enjoy running sustainably.


Some common causes of fatigue in runners include:

  1. Overtraining: Doing too much too soon, increasing mileage or intensity too quickly, or not taking enough rest and recovery can lead to overtraining, resulting in physical and mental sluggishness, low energy, and compromised immunity.
  2. Anemia and Low Iron: Iron deficiency, which is common among vegan, vegetarian, and female runners, can lead to low energy and stamina, impacting various aspects of life, including work, daily activities, appetite, sleep, and mood.
  3. Excessive Training Routine: Training too hard and running fast too often can lead to excessive fatigue, making it difficult to hit intended paces and causing legs to feel constantly tired.
  4. Weight Loss and Appetite Loss: Inadequate nutrition, weight loss, and appetite loss can contribute to fatigue, impacting an athlete's ability to stay focused and perform well.
  5. Low Energy Availability: Athletes participating in sports that emphasize lean bodies, such as figure skating, running, and lightweight rowing, are at higher risk for low energy availability, which can lead to chronic fatigue.
  6. Poor Nutritional Timing: Skipping meals or not consuming enough energy-providing nutrients at the right times can lead to low energy and persistent fatigue.
  7. Mental Health Issues: Conditions such as depression can cause persistent fatigue, affecting both athletic and academic performance.

Understanding these common causes of fatigue in runners can help individuals identify and address the factors contributing to their fatigue, allowing for appropriate interventions and adjustments to their training and lifestyle.