In recent times people or played sports professionally, or in general abstained from active lifestyle. Now the situation very strongly changed. The sport for many became the important part of the life. In the majority of the countries the population or moderately plays sports, or is professional athletes.
What do people receive as positive effects from regular trainings by sport?
The most important that the person receives from exercise stresses - it is health. Strengthening of all muscles of the body and improvement of functionality of internals, the tone of the vascular system - all this the person gets if plays sports at least twice a week. The sport has no adverse effects at the correct observance of the technology of carrying out exercises and balance of loadings though you shouldn't forget that after the trainings in muscles ""lactic acid"" which has an effect pain is formed.
What about those who train six or more times a week?
Such people are called ""professional athletes"". They train according to the schedule with the coach. Professional athletes aren't interested only extension of muscles or the beautiful figure, all trainings are aimed at result which they will show at competitions. On medical examination it is possible to see that they even after intensive training have the quiet heart beat, it is well trained as heart pumps enough blood to support blood circulation and the normal state of the organism at the appropriate level.
At professionals the body is more hardy and developed, but nevertheless possibilities of the human body are limited. There is in sport also such term as occupational diseases. For example: in swimming - it LOR-diseases, and in track and field athletics - diseases of knee and femoral joints. Any athlete isn't defended in them. Such diseases can develop at any age just at occupation any sport, but it won't be compared to victories and achievements which the athlete wins. The statement that the professional sport cripples it is the truth, but the one who wants to win - will win, having even crippled himself, and the one who trains not for himself, and for the coach or parents, will achieve nothing neither in life, nor in sport.