If you’ve been running regularly, putting in the miles, doing the races… yet your pace isn’t improving, you’re not  alone. Almost every runner eventually hits the frustrating “I’m stuck” phase. The good news? A plateau isn’t a dead end — it’s a sign your body needs a new stimulus, smarter structure and some strategic tweaks. This guide blends the latest research (including recent findings published in Cell ), coaching insights from Runner’s World interviews, and the science-d