Runa Koizumi

JapanJapanActive
Born
Oct 3, 1994 (32 years old)
Events
Half Marathon · 10 Kilometres Road

Runa Koizumi is a Japan middle-distance runner, born on October 3, 1994. She competes primarily in the 1500m, Semi and Marathon.

Her personal bests include 4:59.32 in the 1500m, 1:22:35 in the Semi, 2:57:49 in the Marathon and 37:23 in the 10Kilometr. She is currently active on the international athletics circuit, representing Japan.

Personal best · Half Marathon1:22:35
2026 season best4:59.32May 30, 2026 · Okura Sports Park Athletics Field, Tokyo
2026 season best
Personal best · 10 Kilometres Road37:23
Last competitionTwolaps Middle Distance CircuitMay 30, 2026 · 4:59.32
Twolaps Middle Distance Circuit

As of Nov 15, 2026: Half Marathon 1:22:35, 10 Kilometres Road 37:23, 2026 season best 4:59.32 (May 30, 2026, Okura Sports Park Athletics Field, Tokyo (JPN)) · Last competition: Twolaps Middle Distance Circuit, May 30, 2026, 4:59.32 · 32 years old

Personal bests

WA points calculator →
DisciplineResultAll-time
1500mTokyo 2026Japan 1500 m all-time list4:59.32776 pts–
SemiTokyo 2024Japan Half Marathon all-time list1:22:35886 pts–
MarathonOsaka 2026Japan Marathon all-time list2:57:49874 pts–
10KilometrTokyo 202637:23–

Progression

SeasonDisciplineResultWindDateCompetitions
20261500m 4:59.32–May 30, 2026Twolaps Middle Distance Circuit
202610Kilometr 37:23–Jan 11, 2026Tokyo New Year Half Marathon
2026Marathon 2:57:49–Feb 22, 2026Osaka Marathon
2024Semi 1:22:35–Oct 20, 2024Tokyo Legacy Half Marathon
FAQ

Frequently asked questions

Runa Koizumi's Half Marathon personal best is 1:22:35, set on Oct 20, 2024 in Tokyo (JPN).

Runa Koizumi competes in the Half Marathon and 10 Kilometres Road.

2026 season best: 4:59.32, set on May 30, 2026 in Okura Sports Park Athletics Field, Tokyo (JPN). Last competition: Twolaps Middle Distance Circuit on May 30, 2026, 4:59.32.