Feeling tired after exercise is normal. A workout uses energy, challenges your muscles and raises your heart rate, so some level of fatigue is expected. However, if you regularly feel extremely tired after even a normal workout, there may be several reasons behind it. You May Be Pushing Yourself Too Hard One common reason for post-workout fatigue is exercising at a higher intensity than your body is ready for. Increasing the duration, weight or intensity too quickly can leave you feeling exhausted. A