Hidetsugu (荒井秀次) Arai
ID 952794
Born : 1972 Cat. M50 Ultrarunner since 2017 JPN
49
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
78
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
2
Countries visited ?FRAFranceJPNJapan
6,6%
Rank quotient ?This runner's calculation uses 50 eligible race(s): Σ(rank − 1) = 739; Σ finishers = 11 192. 739 / 11 192 × 100 = 6.60%. A win adds 0 to the numerator. Lower is better.

Totals

Ultras completed50
Km — ultra races8 056 km
> 100 km32
> 160 km21
> 200 km14
> 24h12
Longest race516,0 km
21st River Road Foot Race 516 km — 30/4/2026

Km per year (ultra races)

1 283
8 races
2022
1 239
7 races
2023
1 103
6 races
2024
1 489
8 races
2025
1 091
4 races
2026

Race types (share of distance)

Road97,3%
Elim.2,7%

Wins & podiums (ultra)

🏆 Win7
🏆 Win M8
🏅 Top 321
🏅 Top 3 M25
Longest winning streak2
Current streak0

Records

100 km7h43'2650 mi7h36'546 h83,04 km12 h119,54 km24 h261,28 kmBackyard33 loops

HISTORY

51 race(s) · 4 split(s) nested
DateRacePerf.Rk
2026
18.07 300km JPN4th Round of the Boso Peninsula 300K 2d 03:24:59 h6
23.05 12h JPNIAU 24h Asia and Oceania Championships - 12h Split 123.750 km20
23.05 24h JPNIAU 24h Asia and Oceania Championships 195.104 km47
30.04 516km JPN21st River Road Foot Race 516 km 3d 20:55:19 h7
12.04 80km JPN11th Tamagawa Ultra Marathon - 80 km 7:36:54 h2 🥈
2025
18.10 24h FRA12ème 24 heures d'Albi, IAU 24h WC 203.664 km158
18.10 24h FRA12ème 24 heures d'Albi, WMA 24h WC 203.664 km68
13.09 12h JPN20. Shonan Int. Relay Marathon 12 Hour Run 91.340 km8
22.08 101km JPN12th World Cultural Heritage "Fuji" Foot Race 10:54:46 h8
21.06 24h JPN1st Masuda 24 Hours Ultra Truck Race 136.800 km19
24.05 24h JPN4th Hirosaki 24h Ultra Run 261.280 km2 🥈
03.05 251km JPN20th River Road Foot Race 251 km 30:27:43 h2 🥈
08.03 24h JPN16th Jingu Gaien 24 Hour Challenge 240.236 km4
2024
16.11 130km JPN2nd Mito Kaido Journey run 14:48:43 h1 🏆
14.09 250km JPN7th Utsukushima Fukushima Journey Run 250K 37:55:46 h7
21.05 24h JPN3rd Hirosaki 24h Ultra Run 242.512 km4
14.04 80km JPN9th Tamagawa Ultra Marathon - 80 km 7:41:05 h1 🏆
09.03 200km JPN14th Little Edo Oedo 200k 23:49:53 h2 🥈
07.01 200km JPN4th Japan Trophy 200 23:25:59 h8
2023
18.11 130km JPN1st Mito Kaido Journey run 14:51:15 h1 🏆
28.10 147km JPN5th Autumn leaves in Okumusashi / Chichibu Journey run 17:10:49 h6
16.09 251km JPN6th Utsukushima Fukushima Journey Run 251K 38:52:35 h3 🥉
15.07 280km JPN1st Round of the Boso Peninsula 280K 2d 00:20:35 h3 🥉
02.07 8h JPN29th 8-Hour Endurance Race Tokorozawa - 3 tai 78.400 km4
27.05 24h JPN2nd Hirosaki 24h Ultra Run 223.991 km8
11.03 24h JPN15th Jingu Gaien 24 Hour Challenge 128.244 km78
2022
19.11 Backyard Ultra JPN3rd Last Samurai Standing Backyard Ultra - Tokyo 221.298 km (33h)10
15.10 150km JPN1st Yagurazawa Round Trip Pre-Tournament 18:29:44 h1 🏆
20.08 101km JPN9th World Cultural Heritage "Fuji" Foot Race 10:47:21 h3 🥉
03.07 8h JPN28th 8-Hour Endurance Race Tokorozawa 68.600 km49
22.05 24h JPN1st Hirosaki 24h Ultra Run 223.898 km3 🥉
17.04 118km JPN32th Fuji 5 Lakes 118 km Challenge 11:49:35 h39
12.03 200km JPN12th Little Edo Oedo 200k 23:11:30 h3 🥉
09.01 200km JPN2nd Japan Trophy 200 25:59:00 h26
2021
20.11 12h JPN1st Japan Trophy 12h 119.540 km6
30.10 146km JPN3rd Autumn leaves in Okumusashi / Chichibu Journey run 14:15:13 h2 🥈
17.07 24h JPN1st Japan Trophy 24h 200.000 km9
04.07 8h JPN27th 8-Hour Endurance Race Tokorozawa 98.000 km6
27.02 200km JPN11th Little Edo Oedo 200k 20:42:18 h2 🥈
2020
05.07 8h JPN26th 8-Hour Endurance Race Tokorozawa 93.100 km2 🥈
2019
07.10 100km JPN1st Fuji 4 Lakes 100 km Autumn Challenge 7:43:26 h1 🏆
14.09 6h JPN14. Shonan Int. Relay Marathon 6 hour Run 83.040 km1 🏆
29.06 8h JPN25th 8-Hour Endurance Race Tokorozawa 98.000 km6
21.04 100km JPN29th Fuji 5 Lakes 100 km Challenge 7:53:00 h5
2018
15.09 6h JPN21. Hiratsuka 6 hour race 81.300 km1 🏆
30.06 8h JPN24th 8-Hour Endurance Race Tokorozawa 88.200 km3 🥉
03.06 100km JPN6th Tokyo Shibamata 100 km 9:48:49 h81
22.04 100km JPN28th Fuji 5 Lakes 100 km Challenge 7:59:39 h5
2017
09.09 6h JPN20. Hiratsuka 6 hour race 79.580 km3 🥉
01.07 8h JPN23rd 8-Hour Endurance Race Tokorozawa 64.920 km60
23.04 100km JPN27th Fuji 5 Lakes 100 km Challenge 8:07:32 h5