You can enter any personal best (PB) you’ve achieved—whether it’s for a 5K, 10K, half marathon, or marathon.
Why it matters: Your PB helps REN estimate your current running ability and predict future race times.
Capability Check: When you enter a PB, REN will also ask whether you believe you are currently capable of repeating it. For example, maybe you ran a fast 10K two years ago but haven’t trained much since. This context ensures your plan is realistic.