Let’s first make it clear that a ‘good’ half marathon time is not a clear-cut thing – unless, perhaps, you are an elite runner chasing a set mark for qualification purposes. Instead ...

The 13.1-mile half-marathon is an endurance challenge ... If you'd like to track your pace for any of your training runs, try ...

You get the idea. But is it actually an accurate predictor of half marathon time? Former elite marathoner and running coach ...