Progress against the field
Between Birmingham 2023 and Cardiff 2026, Jack Spencer lost 5:28 to the field.
Over the same races everyone got 11:11 quicker, so 5:43 faster on the clock looks better than it was.
587 days between Birmingham 2023 and Cardiff 2025 is the longest gap compared here, and the second race was 3:22 behind 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
8 races · 8 events
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New York28 May 2026Doubles Open · Men1:11:30 PB124/654Beat 81%
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Cardiff29 Apr 2026Individual Open · Men1:14:26 PB116/456Beat 75%
↑ 334 days after Cardiff 2025 2:06 worse than the field Faster on the clock, behind the field Why ↓Close ↑
2:45 faster on the clock looks better than it was: the race was 4:51 faster for everyone, which leaves this 2:06 behind the field.
The fieldCompare these two →4:51 faster This athlete2:45 faster -
London Excel4 Dec 2025Relay · Men1:11:0675/120Beat 38%
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Cardiff30 May 2025Individual Open · Men1:17:11486/1401Beat 65%
↑ 587 days after Birmingham 2023 3:22 worse than the field Faster on the clock, behind the field Why ↓Close ↑
2:58 faster on the clock looks better than it was: the race was 6:20 faster for everyone, which leaves this 3:22 behind the field.
The fieldCompare these two →6:20 faster This athlete2:58 faster -
Toulouse8 Feb 2025Doubles Open · Men1:21:20738/955Beat 23%
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Rotterdam6 Apr 2024Doubles Open · Mixed1:02:29 PB8/534Beat 99%
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Valencia28 Oct 2023Doubles Open · Mixed1:04:4413/215Beat 94%
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Birmingham21 Oct 2023Individual Open · Men1:20:09343/1182Beat 71%