Glycogen is used during virtually every type of activity. Therefore the amount of glycogen stored in your muscles and in certain events in your liver, before you begin to exercise will have a direct effect on your performance.

The greater your pre-exercise glycogen store, the longer you will be able to maintain your exercise intensity and delayed onset of fatigue. Conversely, suboptimal muscle glycogen stores can cause early fatigue, reduce your endurance, reduce your intensity levels and result in lower levels of performance.

You may also delay fatigue by reducing the rate at which you use up muscle glycogen. This can be achieved by gradually building up to your optimal intensity and pacing yourself.