A "fast runner" refers to an individual who can cover distances quickly, often measured in terms of speed, such as miles per hour or meters per second. Fast runners are typically characterized by their strong leg muscles, efficient running techniques, and good cardiovascular fitness. They may participate in various running events, including sprints, middle-distance, and long-distance races. Many fast runners compete in organized sports, such as track and field, where they aim to achieve personal bests or win races. Notable fast runners include athletes like Usain Bolt, known for his world record in the 100 meters, and Haile Gebrselassie, famous for his long-distance achievements.