What is the significance of PR (personal record) in running and how does it impact a runner's performance and goals?

A personal record (PR) in running is the fastest time a runner has ever achieved in a specific distance. PRs are important because they show improvement and progress in a runner's performance. Achieving a PR can boost a runner's confidence, motivation, and help set new goals for future races. It serves as a benchmark for measuring success and can indicate the effectiveness of training and preparation. Overall, PRs play a significant role in a runner's development and can drive them to push themselves further to reach new levels of performance.