Pace zone scheme over the speed axis (m/s, ascending) from a 5 k time.
5 k pace → boundary paces (× multiples) → boundary speeds (= dist/pace).
Edges ascend in speed, so bin 0 is the slowest (Z1 Recovery) and the top bin
the fastest (Z6 Anaerobic) — the labels are ordered to match.
Pace zone scheme over the speed axis (m/s, ascending) from a 5 k time. 5 k pace → boundary paces (× multiples) → boundary speeds (= dist/pace). Edges ascend in speed, so bin 0 is the slowest (Z1 Recovery) and the top bin the fastest (Z6 Anaerobic) — the labels are ordered to match.