How race predictions work

Your race predictions come from your own running.

Your fastest splits

We look through a lot of your running data and pick out your fastest splits, to see how fast you have actually run.

Past and recent runs

We look at how fast you ran in the past and how fast you have run recently, then update your predictions to match. As you keep running, they keep updating.

Altitude

If you have been training at altitude, your predictions are adjusted for it.