Why is phisical activity so important for people?

It is believed that exercise is good for you. A sedentary lifestyle can lead to disease and premature old age. If you exercise just 20 minutes a day, you will feel that the body is warmed up, you have a burst of energy, and to eat I absolutely do not want. This is due to the active metabolism that reconfigures your body. Active exercise cause the action of natural drug for the body - endorphins, and from them we have lifted the mood and we want to enjoy the life. Of course, exercise makes the body elastic and strong sleep.

Почему физическая активность так важна для людей?