Athletes need an adequate hydration since it directly influences the performance of their muscular exercises. Sweat evaporation from skin surface is a powerful cooling mechanism which allows heat elimination which has been produced by muscular work. Therefore, the recovering of liquid lost by sweating is an essential question at the moment of making a physical activity.

Until recently, doctors, trainers or even athletes themselves had advised to consume the larger possible amount of water in order to avoid dehydration. Nowadays, doctors advice to reduce the water consumption because potential risks related to hyper-hydration.

Hydration therefore is a difficult question; on one hand, it is advisable to drink enough during exercise but on the other hand, one should not drink so much since it could cause a dangerous consequence: hyponatremia. Then, which is the correct decision about hydration in order to minimize dehydration and hyponatremia?.

The answer depends on the determination of liquid needs of each person in order to track a record based on the personal needs which takes in account not only the amount of water but also minerals and electrolytes necessary for hydration. This is a simple method which can improve the exercise performance and can reduce potential risk due to inappropriate hydration.