Progress against the field
Between Cardiff 2026 and Birmingham 2026, Jo Jackson pulled 5:57 ahead of the field.
The clock says 8:40 faster, but the races themselves got 2:43 quicker for everyone.
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. The summary above covers Individual Open · Women, the one raced most; every comparison is in the list below.
Every race
4 races · 4 events
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Birmingham31 Oct 2026Individual Open · Women1:21:41 PB192/887Beat 78%
↑ 185 days after Cardiff 2026 5:57 better than the field Why ↓Close ↑
5:57 better than the field: 8:40 faster on the clock, against 2:43 faster for everyone.
The fieldCompare these two →2:43 faster This athlete8:40 faster -
Cardiff29 Apr 2026Individual Open · Women1:30:21257/646Beat 60%
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London Excel4 Dec 2025Doubles Open · Women1:23:08 PB690/1599Beat 57%
↑ 215 days after London 2025, with Chloe Folland 0:07 better than the field Why ↓Close ↑
2:16 faster on the clock, and the race was 2:09 faster for everyone. Whatever changed, it changed for all of them.
The fieldCompare these two →2:09 faster This pair2:16 faster -
London3 May 2025Doubles Open · Women1:25:24615/1118Beat 45%