The main reason why the Japanese sit on the floor is a tradition and that tradition is more specifically known as the Tatami Culture. Earlier, the Japanese had tatami as a type of flooring and because the tatami was not a solid floor, it could not hold the heavyweight of chairs, hence, the Japanese used floor seats as an alternative. Another main reason for is to prevent wasteful use of space by having a lot of furniture. Since Japan is a small country and since many lived in small spaces, this was a necessity at times. Moreover, the fact that Japan is more prone to having tsunamis and earthquakes is another reason why the Japanese prefer the floor. Since there won’t be much furniture, should such a natural disaster occur, it could lead to fewer injuries and also lead to a quick getaway.