Running speed refers to how fast a person can move while running. It is typically measured in units like miles per hour (mph) or meters per second (m/s). Factors that influence running speed include a runner's physical fitness, technique, and the surface they are running on. Training can improve running speed through various exercises, such as sprints and interval training. Additionally, proper footwear and warm-up routines can enhance performance and reduce the risk of injury. Athletes often track their running speed to monitor progress and set goals for improvement, especially in competitive events like marathons or sprints.