The term for quickly changing direction while running in sports is called "agility." Agility is an essential skill in various sports, including basketball, football, and soccer. It involves a combination of balance, coordination, speed, and reflexes that allows athletes to make rapid directional changes while maintaining control and efficiency. Training for agility often includes drills focused on footwork, lateral movements, and reaction time. Developing agility can enhance an athlete’s performance by enabling them to evade opponents or position themselves optimally.