Best efforts — your fastest recorded stretches

Your best efforts are the fastest continuous stretches inside your recorded runs — your quickest 1 km, 5 km, 10 km and so on. They don't have to come from a race: a hard tempo buried in a long run counts, because the effort happened whether or not it had a bib number.

Records are the ones you confirm. The Personal records page (See all on your profile's records card) lists the fastest time Runsei found at each distance, and you decide which are your real records: tap Confirm, or I've run faster and enter the time. A time slower than the one we hold is refused, with the reason. You can add a record from before Runsei, and choose which distances you track. Runsei celebrates a new personal best only when it beats a record you have confirmed, so it never cheers for something it cannot know is a record.

They're facts, not predictions. They live in your profile, beside your other numbers — not on the results screen, which answers "is the training working?". A past best is something you did; a race projection is something the model thinks you could do, and mixing the two makes both harder to trust.

Honest about the window. Runsei holds about the last year of your runs, and the recent-form list says so on the card. It doesn't claim an all-time record it never saw; for an older one, type it in. Each row opens the run it came from, so you can always check what it actually was.