How to activate my body?

"A healthy mind in a healthy body" We have been saying this a long time ago, but we do not know the meaning of this statement well, or perhaps we do not care about it and do not care about it, what is the meaning of this statement? And what is their interpretation?

This means that a person who cares for himself and the integrity of his body, he has an active mind and gets the highest achievement in school and in practical life, and a person who is accused of the integrity of his body rarely get sick and live a very healthy life.