The minerals are found in many foods, are illustrated as an example those with copper. Micronutrients (vitamins and minerals) develop a large number of essential functions in the body. The main minerals (in alphabetical order) are sulfur, calcium, chlorine, cobalt, copper, fluorine, phosphorus, iron, magnesium, manganese, potassium, selenium, sodium, iodine and zinc. Some of them are found in large amounts in the body, while others require only a very small amount (for this reason are called elements or ‘trace minerals’). The minerals can form the basis of some body tissues ( such as calcium in bones), may provide essential elements of hormones (such as iodine in the thyroid) and assist with vital body functions (such as iron in healthy blood composition).There are several stores of minerals in the body, often mineral-specific, so there is for example that is stored in bone calcium and phosphorus, potassium and magnesium cells in the blood and the interstitial water and sodium chlorine. Minerals are generally specific tissues that are freely available in the metabolic processes that occur in them. Most of the reserves of minerals are found in blood plasma and interstitial fluid. The intake of foods with certain content of minerals is the main entrance of minerals to the body, while the excretions (sweat, urine, etc..) Mean the departure of many of the minerals. Some minerals have influence on the development of sport as: Potassium – Potassium is important for the transmission of nerve impulses, maintaining the membrane potential and helps muscle contraction. The majority of ingested potassium enters the bloodstream through absorption that makes him in the stomach.The excess of potassium are excreted in the urine, diarrhea is one of the causes of excessive potassium loss. During exercise potassium is released by repeated contractions of the muscles, this loss is due to change in the permeability of cell walls. Potassium is stored as glycogen and glycogen to be released by oxidizing potassium potassium thus exists in the interstitial fluid increases and is thus eliminated from the blood plasma. The potassium concentration is higher in the intensive phase of the exercise and this has suggested to researchers that the potassium comes from the damaged muscle fibers, although there is no evidence about this fact. Potassium losses in sweat are common during exercise, the concentration of potassium in sweat is the same as that of potassium in blood plasma. At the end of the exercise potassium is released primarily in the urine, perhaps because the kidney is stimulated to retain sodium and fluid homeostasis therefore sodium potassium changes.The daily recommended amount for an athlete is 2 g / day (8 g / day is a very high rate). Potassium is found in many foods because it is a constituent of many cells, therefore is in fruits (bananas, oranges), vegetables (potatoes) and meat. Magnesium – The magnesium content in the body ranges between 20-30 g, approximately 40 of this amount is found in muscle cells, 60 in the skeleton and only 1 of the extracellular fluid. 49 is a nutrient found in many enzymes remains a great need in the metabolic process. Plays an important role in neuromuscular transmission. Has been detected low levels of magnesium in the blood plasma of endurance athletes for explanation theories have been developed. Fish, meat and milk are low in magnesium, while vegetables and some fruits such as bananas, mushrooms, blueberries and some vegetables are relatively rich in this mineral.Calcium – The human body has about 1.5 kg of calcium while the vast majority of it in the skeleton, only a small part is in the blood plasma. The skeleton is constantly renewing calcium, the calcium excess is eliminated primarily in urine. Calcium excretion in the urine is strongly influenced by the intake of foods rich in calcium. Calcium has a very useful exercise, helping in the initial contraction of the muscle. Calcium levels in blood plasma did not differ between athletes and sedentary people. The main foods that provide calcium are dairy products. Phosphorus – As calcium is housed in the skeleton mostly, intake controls bone growth.