Athletes have to keep healthy / fit.

Too many athletes are fit but unhealthy. Excess high training intensity or training volume and/or excess consumption of processed/refined dietary carbohydrates can contribute to reduced health in athletes and even impair performance.

Explanation:

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amaterasu is my sister! wow so rude!

the development of trade during the middle age increased to the change given in the agriculture, which gave money, industry and markets a bigger importance in economy. the agriculture production was more than the consumption, which meant the creation of wider markets out of the areas. besides, with the end of multiple wars, the population increased and new trade routes were created.