BMX has its roots in the racing culture that existed in California in the mid-1970s. Inspired by motocross riders, children tried to imitate their heroes by performing airborne tricks on their bikes. The sport has been transformed from grassroots and a “misfit” culture to a mainstream sport thanks to extensive television coverage which has made it recognisable around the world with World Championships now held annually. At Tokyo 2020 Games, competitors will compete in the park discipline which sees riders execute tricks on obstacles such as walls, box jumps and spines. They are given 60 seconds to perform acrobatics tricks and skills, with tricks scored on multiple aspects including difficulty, originality, execution, height and creativity. BMX freestyle will make its Olympic debut at Tokyo 2020, where it will bring a fresh, youthful feel to the Olympic programme. ──2020奧運官網(註1)