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BOSTON MARATHON 2025

Jenna Britson

Bib: 20088•F

IA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 39%
Masters (Masters Women)
#0 / 6759
Top 24%
Division (F40-44)
#0 / 1718
Top 48%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
25:42
Rank: #18545
Start → 5K
8:16/mi
25:42 split
10K· 6.21 mi
50:52
Rank: #17883 (+662)
5K → 10K
8:06/mi
25:10 split
15K· 9.32 mi
1:15:51
Rank: #17349 (+534)
10K → 15K
8:02/mi
24:59 split
20K· 12.43 mi
1:41:07
Rank: #16945 (+404)
15K → 20K
8:08/mi
25:16 split
Half· 13.11 mi
1:46:29
Rank: #16834 (+111)
20K → Half
7:52/mi
5:22 split
25K· 15.53 mi
2:05:47
Rank: #16308 (+526)
Half → 25K
7:58/mi
19:18 split
30K· 18.64 mi
2:31:20
Rank: #15648 (+660)
25K → 30K
8:13/mi
25:33 split
20M
2:42:42
Rank: #15398 (+250)
30K → 20M
8:22/mi
11:22 split
21M
2:51:57
Rank: #15318 (+80)
20M → 21M
9:15/mi
9:15 split
35K· 21.75 mi
2:57:57
Rank: #15174 (+144)
21M → 35K
8:01/mi
6:00 split
23M
3:08:31
Rank: #14995 (+179)
35K → 23M
8:26/mi
10:34 split
24M
3:16:47
Rank: #14879 (+116)
23M → 24M
8:16/mi
8:16 split
40K· 24.85 mi
3:24:03
Rank: #14811 (+68)
24M → 40K
8:30/mi
7:16 split
25.2M
3:27:27
Rank: #14826 (-15)
40K → 25.2M
9:52/mi
3:24 split
Finish· 26.22 mi
3:35:45
Rank: #14765 (+61)
25.2M → Finish
8:09/mi
8:18 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:46:29
Pace8:07 /mi
2nd Half
Distance13.11 mi
Time1:49:16
Pace8:20 /mi
📊Positive Split: 2.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:17:2025:428:1625:42
8:16
-
10K
6.21 mi11:42:3050:528:1125:10
8:06
-0:10
15K
9.32 mi12:07:291:15:518:0824:59
8:02
-0:04
20K
12.43 mi12:32:451:41:078:0825:16
8:08
+0:06
Half
13.11 mi12:38:071:46:298:075:22
7:52
-0:16
25K
15.53 mi12:57:252:05:478:0619:18
7:58
+0:06
30K
18.64 mi13:22:582:31:208:0725:33
8:13
+0:15
20M
20.00 mi13:34:202:42:428:0811:22
8:22
+0:09
21M
21.00 mi13:43:352:51:578:119:15
9:15
+0:53
35K
21.75 mi13:49:352:57:578:116:00
8:01
-1:14
23M
23.00 mi14:00:093:08:318:1210:34
8:26
+0:25
24M
24.00 mi14:08:253:16:478:128:16
8:16
-0:10
40K
24.85 mi14:15:413:24:038:137:16
8:30
+0:14
25.2M
25.20 mi14:19:053:27:278:143:24
9:52
+1:22
Finish
26.22 mi14:27:233:35:458:148:18
8:09
-1:43

Checkpoints & Pacing

📈Pace Line

Pace Progression

Track your pace changes throughout the race. Dot colors mark your quickest to easiest segments, relative to your own pace.

Fastest Pace

7:52 /mi

Average Pace

8:14 /mi

Slowest Pace

9:52 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

5:22

2% of race

Time at Steady Pace

3:10:28

88% of race

Time at Slower Pace

19:55

9% of race

Average Pace: 8:14 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

🎨Heatmap

Pace Heatmap

Where you sped up and eased off relative to your own pace across the race. Colors are relative to your own range, not to other runners.

Loading...
0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Click or hover over segments to see details

✨Sparklines

Checkpoint Splits with Pace Trends

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:17:2025:428:1625:42
8:16
#18545
10K
6.21 mi11:42:3050:528:1125:10
8:06
#17883
15K
9.32 mi12:07:291:15:518:0824:59
8:02
#17349
20K
12.43 mi12:32:451:41:078:0825:16
8:08
#16945
Half
13.11 mi12:38:071:46:298:075:22
7:52
#16834
25K
15.53 mi12:57:252:05:478:0619:18
7:58
#16308
30K
18.64 mi13:22:582:31:208:0725:33
8:13
#15648
20M
20.00 mi13:34:202:42:428:0811:22
8:22
#15398
21M
21.00 mi13:43:352:51:578:119:15
9:15
#15318
35K
21.75 mi13:49:352:57:578:116:00
8:01
#15174
23M
23.00 mi14:00:093:08:318:1210:34
8:26
#14995
24M
24.00 mi14:08:253:16:478:128:16
8:16
#14879
40K
24.85 mi14:15:413:24:038:137:16
8:30
#14811
25.2M
25.20 mi14:19:053:27:278:143:24
9:52
#14826
Finish
26.22 mi14:27:233:35:458:148:18
8:09
#14765
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi185456653665316360(Top 58%)5348(Top 44%)5348(Top 311%)
10K6.21 mi3.10 mi17883+6626256+3976256+39717205(Top 61%)5822(Top 48%)5822(Top 339%)
15K9.32 mi3.11 mi17349+5345922+3345922+33416360(Top 58%)5348(Top 44%)5348(Top 311%)
20K12.43 mi3.11 mi16945+4045709+2135709+21315877(Top 56%)5142(Top 42%)5142(Top 299%)
Half13.11 mi0.68 mi16834+1115629+805629+8014866(Top 52%)4544(Top 37%)4544(Top 264%)
25K15.53 mi2.42 mi16308+5265345+2845345+28413605(Top 48%)4005(Top 33%)4005(Top 233%)
30K18.64 mi3.11 mi15648+6605019+3265019+32613010(Top 46%)3832(Top 31%)3832(Top 223%)
20M20.00 mi1.36 mi15398+2504925+944925+9412963(Top 46%)3961(Top 32%)3961(Top 231%)
21M21.00 mi1.00 mi15318+804902+234902+2314902(Top 52%)5118(Top 42%)5118(Top 298%)
35K21.75 mi0.75 mi15174+1444836+664836+6612451(Top 44%)3886(Top 32%)3886(Top 226%)
23M23.00 mi1.25 mi14995+1794764+724764+7212959(Top 46%)4253(Top 35%)4253(Top 248%)
24M24.00 mi1.00 mi14879+1164736+284736+2813065(Top 46%)4356(Top 36%)4356(Top 254%)
40K24.85 mi0.85 mi14811+684725+114725+1113452(Top 47%)4679(Top 38%)4679(Top 272%)
25.2M25.20 mi0.35 mi14826-154737-124737-1216405(Top 58%)6266(Top 51%)6266(Top 365%)
Finish26.22 mi1.02 mi14765+614736+14736+113926(Top 49%)4916(Top 40%)4916(Top 286%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 58%
×21stories
+97ft-345ft

Overall

16360

Females

5348

F40-44

5348

5K→10K

3.1 - 6.2 mi

Top 61%
×5stories
+79ft-138ft

Overall

17205

Females

5822

F40-44

5822

10K→15K

6.2 - 9.3 mi

Top 58%
×3stories
+67ft-78ft

Overall

16360

Females

5348

F40-44

5348

15K→20K

9.3 - 12.4 mi

Top 56%
×5stories
+106ft-86ft

Overall

15877

Females

5142

F40-44

5142

20K→Half

12.4 - 13.1 mi

Top 52%
×2stories
+19ft-37ft

Overall

14866

Females

4544

F40-44

4544

Half→25K

13.1 - 15.5 mi

Top 48%
×4stories
+66ft-88ft

Overall

13605

Females

4005

F40-44

4005

25K→30K

15.5 - 18.6 mi

Top 46%
×9stories
+181ft-148ft

Overall

13010

Females

3832

F40-44

3832

30K→20M

18.6 - 20.0 mi

Top 46%
×5stories
+64ft-50ft

Overall

12963

Females

3961

F40-44

3961

20M→21M

20.0 - 21.0 mi

Top 52%
×8stories
+106ft-24ft

Overall

14902

Females

5118

F40-44

5118

21M→35K

21.0 - 21.8 mi

Top 44%
×7stories
+17ft-86ft

Overall

12451

Females

3886

F40-44

3886

35K→23M

21.8 - 23.0 mi

Top 46%
×5stories
+23ft-63ft

Overall

12959

Females

4253

F40-44

4253

23M→24M

23.0 - 24.0 mi

Top 46%
×6stories
+12ft-82ft

Overall

13065

Females

4356

F40-44

4356

24M→40K

24.0 - 24.9 mi

Top 47%
×1story
+6ft-20ft

Overall

13452

Females

4679

F40-44

4679

40K→25.2M

24.9 - 25.2 mi

Top 58%
×1story
+13ft-16ft

Overall

16405

Females

6266

F40-44

6266

25.2M→Finish

25.2 - 26.2 mi

Top 49%
×2stories
+22ft-21ft

Overall

13926

Females

4916

F40-44

4916

Passing Analysis

Category:
Athletes Passed
4192
Passed By
412
Net Change
+3780
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18545
5K → 10K73674+662#18545#17883
10K → 15K56733+534#17883#17349
15K → 20K43329+404#17349#16945
20K → Half1132+111#16945#16834
Half → 25K5282+526#16834#16308
25K → 30K67010+660#16308#15648
30K → 20M26414+250#15648#15398
20M → 21M14767+80#15398#15318
21M → 35K15612+144#15318#15174
35K → 23M19718+179#15174#14995
23M → 24M14327+116#14995#14879
24M → 40K10032+68#14879#14811
40K → 25.2M3449-15#14811#14826
25.2M → Finish10443+61#14826#14765
TOTALS4192412+3780
📊

Passing Visuals

Category:
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🔥Passing Intensity

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing