Progress against the field
Between Heerenveen 2025 and Amsterdam 2026, Jan Lassooij and Arjo Boerman pulled 6:49 ahead of the field.
Over the same races everyone got 4:51 quicker, so 11:40 faster on the clock looks better than it was.
203 days between Heerenveen 2025 and Utrecht 2025 is the longest gap compared here, and the second race was 6:50 better than the field.
How this is worked out ⓘ
A finish time moves for two reasons: the athlete, and the race — its course, its floor, its day. For each pair of races in a row in one category, we take everyone who raced both and use the middle of how much they moved (the median) as "the race". Whatever is left is the athlete. Doubles are compared only when the same two people raced both, and told as the pair's; relays are left out. A pair with fewer than 15 athletes in common is not shown.
Every race
5 races · 5 events
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Heerenveen14 May 2026Individual Open · Men1:41:29 PB435/490Beat 11%
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Amsterdam21 Jan 2026Doubles Open · Men1:11:31 PB461/994Beat 54%
↑ 54 days after Utrecht 2025, with Arjo Boerman 0:01 worse than the field Why ↓Close ↑
3:29 faster on the clock, and the race was 3:30 faster for everyone. Whatever changed, it changed for all of them.
The fieldCompare these two →3:30 faster This pair3:29 faster -
Utrecht28 Nov 2025Doubles Open · Men1:15:00425/879Beat 52%
↑ 203 days after Heerenveen 2025, with Arjo Boerman 6:50 better than the field Why ↓Close ↑
8:11 faster on the clock, and the race was 1:21 faster for everyone, so 6:50 of it was this pair.
The fieldCompare these two →1:21 faster This pair8:11 faster -
Heerenveen9 May 2025Doubles Open · Men1:23:11238/309Beat 23%
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Amsterdam10 Oct 2024Doubles Open · Men1:22:44645/855Beat 25%