Sport means physical and mental abilities as well as a regular and well-balanced life. People should take advantage of doing sport in the best way. Therefore, I think that sport is necessary for all people to keep their body healthy and prevent its distortion and aging. Also, sport affects their mental health in a positive way. Along with these, sports activities in developed countries are more important than those in poor countries. Hence, the young in developed countries grow up healthily. In other words, sports have a number of effects on young people. Primarily, it contributes much to their personal development. Also, it develops the concept of character search, role-taking society and responsibility. In short, sports influence people in various ways.
Dear Burak, your writing skill is improving but you should revise the irrelevant sentences in your paragraph.