The second Monday in October is a holiday in Japan. Of course it’s not “Columbus Day”. It’s called “Taiiku no Hi (体育の日)” or “Health and Sports Day”. This holiday started in 1966. It used to be the 10th of October because the Tokyo Olympic opening ceremony was held on 10/10/1964, but in 2000 Japan started incorporating the American holiday system and changed the holiday from the 10th of October to the second Monday in October. This holiday is dedicated to growing healthy minds and bodies by playing sports. Of course you should exercise more than just once a year. lol