In order to achieve optimal performance in sport, it is essential to be well fuelled and well hydrated. Taking part in physical activity means the body needs energy. The amount needed depends on the duration and type of activity. For example, an elite footballer playing in the Premier League will need more energy than a footballer playing in a Sunday afternoon pub football match.
Energy is measured in calories and is obtained from stores in the body or from the food we eat. Glycogen is the main energy source used by the muscles and can be used for both aerobic and anaerobic exercise. Competing with low glycogen stores will make you feel tired and your performance will not reach its full potential.
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