Many parents I know have noticed something strange: their sons who are playing video games all day long share a similar hobby which is to buy the newest sneakers. Their doctors told them that only the newest shoes can attract them and help them release a special chemical compound called dopamine. It maintains a feeling of excitement in people and inhibits sadness and frustration. But it can only act for a few days or even a few hours. So, the parents notice that there are more and more new sneakers appearing in their sons' room. I had no idea why the boys were so addicted to new sneakers until their parents told me that their children liked to watch NBA games while playing video games. On the other hand, there are some boys playing basketball outside wearing new sneakers. They are addicted to the feeling of sweating and being respected by others. In fact, while they are playing basketball, more dopamine is released. So, dopamine is already an essential part of our bodies but how can we make it even more important, by buying new shoes or doing some physical exercise outside?