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BOSTON MARATHON 2025

Brenna Walker

Bib: 15877•F

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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 48%
Division (F18-39)
#0 / 5469
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:57
Rank: #14070
Start → 5K
23:57 | 7:43/mi
10K· 6.21 mi
48:12
Rank: #14406 (-336)
5K → 10K
24:15 | 7:48/mi
15K· 9.32 mi
1:13:00
Rank: #14911 (-505)
10K → 15K
24:48 | 7:59/mi
20K· 12.43 mi
1:39:04
Rank: #15723 (-812)
15K → 20K
26:04 | 8:23/mi
Half· 13.11 mi
1:44:40
Rank: #15805 (-82)
20K → Half
5:36 | 8:12/mi
25K· 15.53 mi
2:05:48
Rank: #16320 (-515)
Half → 25K
21:08 | 8:43/mi
30K· 18.64 mi
2:33:45
Rank: #16518 (-198)
25K → 30K
27:57 | 9:00/mi
20M
2:46:16
Rank: #16593 (-75)
30K → 20M
12:31 | 9:13/mi
21M
2:56:07
Rank: #16621 (-28)
20M → 21M
9:51 | 9:51/mi
35K· 21.75 mi
3:02:50
Rank: #16667 (-46)
21M → 35K
6:43 | 8:59/mi
23M
3:14:37
Rank: #16761 (-94)
35K → 23M
11:47 | 9:25/mi
24M
3:23:34
Rank: #16779 (-18)
23M → 24M
8:57 | 8:57/mi
40K· 24.85 mi
3:31:28
Rank: #16796 (-17)
24M → 40K
7:54 | 9:14/mi
25.2M
3:35:00
Rank: #16815 (-19)
40K → 25.2M
3:32 | 10:15/mi
Finish· 26.22 mi
3:43:41
Rank: #16804 (+11)
25.2M → Finish
8:41 | 8:31/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:44:40
Pace7:59 /mi
2nd Half
Distance13.11 mi
Time1:59:01
Pace9:05 /mi
📊Positive Split: 13.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:56:2923:577:4323:57
7:43
-
10K
6.21 mi11:20:4448:127:4524:15
7:48
+0:05
15K
9.32 mi11:45:321:13:007:5024:48
7:59
+0:11
20K
12.43 mi12:11:361:39:047:5826:04
8:23
+0:24
Half
13.11 mi12:17:121:44:407:595:36
8:12
-0:11
25K
15.53 mi12:38:202:05:488:0621:08
8:43
+0:31
30K
18.64 mi13:06:172:33:458:1527:57
9:00
+0:17
20M
20.00 mi13:18:482:46:168:1912:31
9:13
+0:13
21M
21.00 mi13:28:392:56:078:239:51
9:51
+0:38
35K
21.75 mi13:35:223:02:508:246:43
8:59
-0:52
23M
23.00 mi13:47:093:14:378:2811:47
9:25
+0:26
24M
24.00 mi13:56:063:23:348:298:57
8:57
-0:28
40K
24.85 mi14:04:003:31:288:307:54
9:14
+0:17
25.2M
25.20 mi14:07:323:35:008:323:32
10:15
+1:01
Finish
26.22 mi14:16:133:43:418:328:41
8:31
-1:44

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

7:43 /mi

Average Pace

8:32 /mi

Slowest Pace

10:15 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:53:21

51% of race

Time at Steady Pace

1:25:10

38% of race

Time at Slower Pace

25:10

11% of race

Average Pace: 8:32 /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 mi10:56:2923:577:4323:57
7:43
#14070
10K
6.21 mi11:20:4448:127:4524:15
7:48
#14406
15K
9.32 mi11:45:321:13:007:5024:48
7:59
#14911
20K
12.43 mi12:11:361:39:047:5826:04
8:23
#15723
Half
13.11 mi12:17:121:44:407:595:36
8:12
#15805
25K
15.53 mi12:38:202:05:488:0621:08
8:43
#16320
30K
18.64 mi13:06:172:33:458:1527:57
9:00
#16518
20M
20.00 mi13:18:482:46:168:1912:31
9:13
#16593
21M
21.00 mi13:28:392:56:078:239:51
9:51
#16621
35K
21.75 mi13:35:223:02:508:246:43
8:59
#16667
23M
23.00 mi13:47:093:14:378:2811:47
9:25
#16761
24M
24.00 mi13:56:063:23:348:298:57
8:57
#16779
40K
24.85 mi14:04:003:31:288:307:54
9:14
#16796
25.2M
25.20 mi14:07:323:35:008:323:32
10:15
#16815
Finish
26.22 mi14:16:133:43:418:328:41
8:31
#16804
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi140703956395615922(Top 56%)5104(Top 42%)5104(Top 93%)
10K6.21 mi3.10 mi14406-3364179-2234179-22314886(Top 52%)4474(Top 37%)4474(Top 82%)
15K9.32 mi3.11 mi14911-5054504-3254504-32515922(Top 56%)5104(Top 42%)5104(Top 93%)
20K12.43 mi3.11 mi15723-8124995-4914995-49117498(Top 62%)6050(Top 49%)6050(Top 111%)
Half13.11 mi0.68 mi15805-825033-385033-3817367(Top 61%)5966(Top 49%)5966(Top 109%)
25K15.53 mi2.42 mi16320-5155355-3225355-32218499(Top 65%)6700(Top 55%)6700(Top 123%)
30K18.64 mi3.11 mi16518-1985536-1815536-18117678(Top 62%)6403(Top 52%)6403(Top 117%)
20M20.00 mi1.36 mi16593-755607-715607-7117836(Top 63%)6610(Top 54%)6610(Top 121%)
21M21.00 mi1.00 mi16621-285650-435650-4317707(Top 62%)6640(Top 54%)6640(Top 121%)
35K21.75 mi0.75 mi16667-465702-525702-5218135(Top 64%)6971(Top 57%)6971(Top 127%)
23M23.00 mi1.25 mi16761-945788-865788-8618291(Top 64%)7128(Top 58%)7128(Top 130%)
24M24.00 mi1.00 mi16779-185829-415829-4117128(Top 60%)6563(Top 54%)6563(Top 120%)
40K24.85 mi0.85 mi16796-175869-405869-4017544(Top 62%)6877(Top 56%)6877(Top 126%)
25.2M25.20 mi0.35 mi16815-195902-335902-3318110(Top 64%)7185(Top 59%)7185(Top 131%)
Finish26.22 mi1.02 mi16804+115908-65908-616372(Top 58%)6232(Top 51%)6232(Top 114%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 56%
×21stories
+97ft-345ft

Overall

15922

Females

5104

F18-39

5104

5K→10K

3.1 - 6.2 mi

Top 52%
×5stories
+79ft-138ft

Overall

14886

Females

4474

F18-39

4474

10K→15K

6.2 - 9.3 mi

Top 56%
×3stories
+67ft-78ft

Overall

15922

Females

5104

F18-39

5104

15K→20K

9.3 - 12.4 mi

Top 62%
×5stories
+106ft-86ft

Overall

17498

Females

6050

F18-39

6050

20K→Half

12.4 - 13.1 mi

Top 61%
×2stories
+19ft-37ft

Overall

17367

Females

5966

F18-39

5966

Half→25K

13.1 - 15.5 mi

Top 65%
×4stories
+66ft-88ft

Overall

18499

Females

6700

F18-39

6700

25K→30K

15.5 - 18.6 mi

Top 62%
×9stories
+181ft-148ft

Overall

17678

Females

6403

F18-39

6403

30K→20M

18.6 - 20.0 mi

Top 63%
×5stories
+64ft-50ft

Overall

17836

Females

6610

F18-39

6610

20M→21M

20.0 - 21.0 mi

Top 62%
×8stories
+106ft-24ft

Overall

17707

Females

6640

F18-39

6640

21M→35K

21.0 - 21.8 mi

Top 64%
×7stories
+17ft-86ft

Overall

18135

Females

6971

F18-39

6971

35K→23M

21.8 - 23.0 mi

Top 64%
×5stories
+23ft-63ft

Overall

18291

Females

7128

F18-39

7128

23M→24M

23.0 - 24.0 mi

Top 60%
×6stories
+12ft-82ft

Overall

17128

Females

6563

F18-39

6563

24M→40K

24.0 - 24.9 mi

Top 62%
×1story
+6ft-20ft

Overall

17544

Females

6877

F18-39

6877

40K→25.2M

24.9 - 25.2 mi

Top 64%
×1story
+13ft-16ft

Overall

18110

Females

7185

F18-39

7185

25.2M→Finish

25.2 - 26.2 mi

Top 58%
×2stories
+22ft-21ft

Overall

16372

Females

6232

F18-39

6232

Passing Analysis

Category:
Athletes Passed
1116
Passed By
3850
Net Change
-2734
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#14070
5K → 10K160496-336#14070#14406
10K → 15K76581-505#14406#14911
15K → 20K61873-812#14911#15723
20K → Half1395-82#15723#15805
Half → 25K64579-515#15805#16320
25K → 30K168366-198#16320#16518
30K → 20M84159-75#16518#16593
20M → 21M99127-28#16593#16621
21M → 35K54100-46#16621#16667
35K → 23M82176-94#16667#16761
23M → 24M7492-18#16761#16779
24M → 40K7693-17#16779#16796
40K → 25.2M2746-19#16796#16815
25.2M → Finish7867+11#16815#16804
TOTALS11163850-2734
📊

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