{"schema_version":"2026-06-12","inputs":{"distance":"10k","timeSeconds":3000},"basis":{"distance_km":10,"time_seconds":3000},"predictions":[{"distance":"5k","distance_km":5,"time_seconds":1439,"time_hms":"23:59","pace_per_km":"4:48 /km"},{"distance":"10k","distance_km":10,"time_seconds":3000,"time_hms":"50:00","pace_per_km":"5:00 /km"},{"distance":"half","distance_km":21.0975,"time_seconds":6619,"time_hms":"1:50:19","pace_per_km":"5:14 /km"},{"distance":"marathon","distance_km":42.195,"time_seconds":13801,"time_hms":"3:50:01","pace_per_km":"5:27 /km"}],"equation":"Riegel endurance model: T2 = T1 x (D2 / D1)^1.06 (Pete Riegel, 1981).","license":"https://creativecommons.org/licenses/by/4.0/","source":"https://example.fitgauge.placeholder/statistics/","disclaimer":"Predictions assume even pacing and matched training. Longer-distance estimates, especially the marathon, are a best case, not a promise."}