Jonathan Inglesfield

Born : 1967 Cat. M55 Ultrarunner since 2015

DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.

DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details

Countries visited ?

United Kingdom

Italy

61,7%

Rank quotient ?This runner's calculation uses 24 eligible race(s): Σ(rank − 1) = 3 884; Σ finishers = 6 294. 3 884 / 6 294 × 100 = 61.71%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed24

Km — ultra races2 851 km

> 100 km9

> 160 km7

> 200 km2

Longest race431,3 km

11th Spine Race — 15/1/2023

Km per year (ultra races)

418

2022

431

2023

150

2024

2025

161

2026

Race types (share of distance)

Trail100,0%

Records

50 km5h11'22 100 km14h17'39 50 mi10h08'10 100 mi24h30'15

HISTORY

24 race(s)

Date		Race	Perf.	Rk
2026
23.01	100mi	12th Arc of Attrition by UTMB - Arc 100	34:14:43 h	201
2025
17.05	50mi	14th North Downs Way 50 Mile Race	10:44:09 h	117
2024
06.07	100km	Serpent Trail Race 100km	14:17:39 h	110
16.03	31mi	2nd Hundred Hills 50km	6:22:07 h	180
2023
15.01	268mi	11th Spine Race	6d 05:37:51 h	59
2022
15.10	100mi	11th Autumn 100 Mile Race	25:25:24 h	109
09.01	160mi	1st Spine Challenger - North	3d 05:28:55 h	22
2021
12.06	100mi	9th South Downs Way 100 Mile Race	24:30:15 h	158
2020
19.09	61km	Fox Ultra	7:07:21 h	105
11.01	108mi	9th Spine Challenger	2d 00:29:44 h	18
2019
16.11	50mi	4th Wendover Woods 50	12:38:45 h	119
12.10	82.3km	Lakes in a day Ultra	18:35:02 h	285
12.01	108mi	8th Spine Challenger	2d 04:10:49 h	39
2018
13.10	50mi	Lakes in a day Ultra	19:42:59 h	179
31.08	101km	13ème Courmayeur-Champex-Chamonix	25:12:06 h	1325
07.04	131.9km	The Oner Ultra Trail Run 132km	23:23:03 h	29
03.02	50mi	10th GB Ultra Thames Trot	10:08:10 h	135
2017
17.12	50km	Portsmouth Coastal Waterside 50K	5:11:22 h	195
25.11	50mi	2nd Wendover Woods 50	12:38:09 h	123
16.09	50mi	2nd Chiltern Wonderland 50 Mile Race	10:33:10 h	95
24.06	53.5mi	Race to the King Ultra Marathon	10:55:25 h	116
20.05	46mi	2nd Jurassic Quarter Ultra Marathon	9:54:26 h	15
22.04	60km	Fox Ultra	6:51:14 h	70
2015
10.05	33mi	Marlborough Downs Challenge	6:30:06 h	104

Filter

Runner	Races in common

DUV-index calculation details

#	Date	Race	Credited km	DUV-index+
✓ 1	15/1/2023	11th Spine Race	431,30	×8
✓ 2	9/1/2022	1st Spine Challenger - North	257,50	×5
✓ 3	11/1/2020	9th Spine Challenger	173,81	×3
✓ 4	12/1/2019	8th Spine Challenger	173,81	×3
✓ 5	23/1/2026	12th Arc of Attrition by UTMB - Arc 100	160,93	×3
✓ 6	15/10/2022	11th Autumn 100 Mile Race	160,93	×3
✓ 7	12/6/2021	9th South Downs Way 100 Mile Race	160,93	×3
✓ 8	7/4/2018	The Oner Ultra Trail Run 132km	131,90	×2
✓ 9	31/8/2018	13ème Courmayeur-Champex-Chamonix (CCC)	101,00	×2
✓ 10	6/7/2024	Serpent Trail Race 100km	100,00	×2
✓ 11	24/6/2017	Race to the King Ultra Marathon	86,10	×1
✓ 12	12/10/2019	Lakes in a day Ultra	82,30	×1
✓ 13	17/5/2025	14th North Downs Way 50 Mile Race	80,47	×1
✓ 14	16/11/2019	4th Wendover Woods 50	80,47	×1
✓ 15	13/10/2018	Lakes in a day Ultra	80,47	×1
✓ 16	3/2/2018	10th GB Ultra Thames Trot	80,47	×1
✓ 17	25/11/2017	2nd Wendover Woods 50	80,47	×1
✓ 18	16/9/2017	2nd Chiltern Wonderland 50 Mile Race	80,47	×1
✓ 19	20/5/2017	2nd Jurassic Quarter Ultra Marathon	74,03	×1
✓ 20	19/9/2020	Fox Ultra	61,00	×1
✓ 21	22/4/2017	Fox Ultra	60,00	×1
✓ 22	10/5/2015	Marlborough Downs Challenge	53,11	×1
✓ 23	17/12/2017	Portsmouth Coastal Waterside 50K	50,00	×1
✓ 24	16/3/2024	2nd Hundred Hills 50km	49,89	×1