5K goal times.

Nothing in running is as easy to attempt and as hard to perfect as the 5K. It is the sport's open door — the distance of the weekly parkrun, the lunchtime time trial, the first race anyone finishes — and simultaneously a track discipline raced, at the front, at interval pace. This ladder holds both truths at once: 14 rungs from sub-16 at 3:12 per kilometre to sub-40 at 8:00, every one computed from the Daniels–Gilbert formulas — the engine the Why Not app runs — and every one opening into a full page of splits, readiness evidence and training paces.

The rungs are spaced the way the distance is actually chased. Through the racing heart of the ladder they step by a single minute — at the 5K a minute is a season, and pretending otherwise helps nobody — then widen past 25:00, where goals cluster around the round numbers runners genuinely aim for. Like the 10K, the 5K divides evenly: every rung on this ladder is an exact per-kilometre number, from 3:12 at the top to 8:00 at the door.

The 5K's special privilege is that the test and the goal are the same event. You do not need to predict anything from another distance: run one hard, honest 5K this week, put it through the VDOT calculator, and the ladder shows you your current rung by inspection. The next one up is usually a point or two of VDOT away — one focused block — and the ladder spans 21.7 to 64.6, first finish line to the sharp end, on one table.

Then use the distance's other gift: frequency. A marathon experiment costs a season; a 5K experiment costs a weekend, and the next attempt is never far away. Racing the distance often — at even pacing, off the splits printed on each rung's page — is both the best sharpener and the best diagnostic the 5K has. The fitness that breaks 16 minutes and the fitness that breaks 40 are built differently, but they are proven identically: one honest run against one honest clock.

The caveat on every row is Daniels' own: equivalents assume appropriate training for the distance. At a distance whose front rung runs 3:12 per kilometre, that cuts both ways — endurance built elsewhere does not automatically produce speed, and track speed does not automatically hold for five whole kilometres. The rung pages carry the specifics; the ladder below is the whole distance, priced end to end.

The ladder