In the era of underdeveloped productivity, war has become the most important way to compete for resources. Youth are the most important participants in wars. To win the war, young people must have strong physical fitness. In order to win the war, each City-state youth organized for training. As the leader of the whole of Greece, the city-state of Athens had a population of 250,000 in its heyday. At the same time, Corinth had a population of 90,000, and some city-states had only 5,000 or less. The more the population, the higher the proportion of youth. , The more the city-state can occupy an advantageous position in the competition.
The statement 'Competition mainly depends on people's physical fitness' emphasizes in an era of underdeveloped productivity.