The key to a personal best is having the patience to control your first lap speed and match it closely with the remaining laps. This requires an athlete to develop the skill of pacing that will be built from experience.
A lot of people get sucked into what we’ll call the “GPS Vortex”. We all have been there at times, focusing on the number of miles you’ve logged, haven’t logged, or need to log in a given day/week/month.
Your watch is not a dictator. You are the master of your mind and body. Only you can determine how hard or how easy to run when to speed up or when to slow down. You determine your pace. Your watch does not.