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My Achievements

Since 2019. Systematic work that delivers.

7+
World Records
40,170
km – Longest triathlon
100
marathons in 100 days
574 km
No-sleep run in 86h

History of achievements

2019

100 marathons in 100 days

100 marathons in 100 days, completed alongside a full-time job in a greenhouse. Proof that progress is possible even with a packed schedule.

2019

Dutch Championships – 24-hour Run

Victory at the Dutch Championships in the 24-hour run. The first serious trophy on a new sporting path.

2019

Double Ultra Triathlon – World Championship

4th place at the World Championship in 2× Ironman. Entry onto the global ultra triathlon scene.

2019

Victory – 100 km race in Steenwijk

Win in the 100 km race in Steenwijk. Another proof of the effectiveness of systematic training.

2020

World's Longest Duathlon

The challenge: 120 km running + 1,800 km cycling + 422 km running. Setting the world record for the longest duathlon ever.

2021

Quintuple Ultra Triathlon – World Cup

2nd place at the 5× Ironman World Cup. Confirmed position in the global elite.

2021

World Championships – 48-hour Run

3rd place at the World Championships in the 48-hour run. A medal from the longest timed run event in the world.

2022

🏆 World Record – Quintuple Ultra Triathlon (5× Ironman)

Setting the world record over the 5× Ironman distance. One of the most significant moments of the sporting career.

2022

Deca Ultra Triathlon – World Championship (10× Ironman)

3rd place at the 10× Ironman distance. One of the hardest triathlons in the world.

2023 / 2024

🏆 World Record – Longest Triathlon in History

40,170 km – swimming: 1,205 km / cycling: 31,132 km / running: 7,833 km
From 1 June 2023 to 31 May 2024. 365 days of triathlon covering the length of the Earth's equator. World Record – the longest triathlon in history.

2024

🏆 Victory – Deca Ultra Triathlon

First place: 38 km swimming / 1,800 km cycling / 422 km running.

2025

🏆 World Record – Longest No-Sleep Run

574 km in 86 hours and 14 minutes
16–19 October 2025. "The longest no sleep run / as distance as time."

Race photos

Adrian Kostera – race Adrian Kostera – race Adrian Kostera – race Adrian Kostera – race Adrian Kostera – race Adrian Kostera – race

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Your goals are different from mine – but the method is the same. Systematic work, data, flexibility.

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