TOKYO -- For those above a certain age, sports are all about pushing the lungs, muscles and mind to the limit in the pursuit of victory. They are played in the open air on a track or field, or indoors on a court or in a pool.
But for many people who have never known a world without the internet, that definition looks incomplete. For them, sports are just as likely to be played sitting in a comfortable chair in front of a glowing PC. Instead of a bat, racket or ball, they are equipped with bulky headphones, state-of-the-art keyboards and a lightning-fast mouse.
