蹴鞠(cù jū) is an ancient Chinese sport/game. Descriptions of the game date back to the Han dynasty (2000 years ago). A competitive form of 蹴鞠(cù jū) was used as fitness training for military cavaliers, while other forms were played for entertainment.
Q: According to the radicals of characters, what kind of sport/game that 蹴鞠(cù jū) indicates?