Competitive athletes ask more of their bodies than the average athlete. If you are struggling to improve your speed, distance or time there are a few factors to consider.
Research has shown that poor quality sleep reduces muscle growth after training so make sure you are getting a good nights sleep. Stress can affect sleep quality so consider whether this is affecting you. Stress can also increase risk of injury. If you feel you are not coping with a stressful situation and are using exercise to manage your stress then consider NLP or hypnotherapy.