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BOSTON MARATHON 2025

Henna Brennan

Bib: 27928•F

MA

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
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
27:33
Rank: #21845
Start → 5K
8:52/mi
27:33 split
10K· 6.21 mi
54:30
Rank: #21291 (+554)
5K → 10K
8:40/mi
26:57 split
15K· 9.32 mi
1:21:31
Rank: #20984 (+307)
10K → 15K
8:42/mi
27:01 split
20K· 12.43 mi
1:48:27
Rank: #20566 (+418)
15K → 20K
8:40/mi
26:56 split
Half· 13.11 mi
1:54:21
Rank: #20542 (+24)
20K → Half
8:39/mi
5:54 split
25K· 15.53 mi
2:16:18
Rank: #20493 (+49)
Half → 25K
9:03/mi
21:57 split
30K· 18.64 mi
2:48:46
Rank: #21121 (-628)
25K → 30K
10:27/mi
32:28 split
20M
3:02:42
Rank: #21184 (-63)
30K → 20M
10:15/mi
13:56 split
21M
3:14:12
Rank: #21311 (-127)
20M → 21M
11:30/mi
11:30 split
35K· 21.75 mi
3:21:02
Rank: #21219 (+92)
21M → 35K
9:08/mi
6:50 split
23M
3:33:01
Rank: #21071 (+148)
35K → 23M
9:34/mi
11:59 split
24M
3:42:47
Rank: #21042 (+29)
23M → 24M
9:46/mi
9:46 split
40K· 24.85 mi
3:51:10
Rank: #21003 (+39)
24M → 40K
9:48/mi
8:23 split
25.2M
3:54:51
Rank: #20972 (+31)
40K → 25.2M
10:41/mi
3:41 split
Finish· 26.22 mi
4:03:55
Rank: #20873 (+99)
25.2M → Finish
8:54/mi
9:04 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:54:21
Pace8:43 /mi
2nd Half
Distance13.11 mi
Time2:09:34
Pace9:53 /mi
📊Positive Split: 13.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:44:5227:338:5227:33
8:52
-
10K
6.21 mi12:11:4954:308:4626:57
8:40
-0:12
15K
9.32 mi12:38:501:21:318:4527:01
8:42
+0:02
20K
12.43 mi13:05:461:48:278:4426:56
8:40
-0:02
Half
13.11 mi13:11:401:54:218:435:54
8:39
-0:01
25K
15.53 mi13:33:372:16:188:4621:57
9:03
+0:24
30K
18.64 mi14:06:052:48:469:0332:28
10:27
+1:24
20M
20.00 mi14:20:013:02:429:0813:56
10:15
-0:12
21M
21.00 mi14:31:313:14:129:1511:30
11:30
+1:15
35K
21.75 mi14:38:213:21:029:156:50
9:08
-2:22
23M
23.00 mi14:50:203:33:019:1611:59
9:34
+0:26
24M
24.00 mi15:00:063:42:479:179:46
9:46
+0:12
40K
24.85 mi15:08:293:51:109:188:23
9:48
+0:02
25.2M
25.20 mi15:12:103:54:519:193:41
10:41
+0:53
Finish
26.22 mi15:21:144:03:559:199:04
8:54
-1:47

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

8:39 /mi

Average Pace

9:19 /mi

Slowest Pace

11:30 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:26:48

36% of race

Time at Steady Pace

1:05:24

27% of race

Time at Slower Pace

1:31:43

38% of race

Average Pace: 9:18 /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 mi11:44:5227:338:5227:33
8:52
#21845
10K
6.21 mi12:11:4954:308:4626:57
8:40
#21291
15K
9.32 mi12:38:501:21:318:4527:01
8:42
#20984
20K
12.43 mi13:05:461:48:278:4426:56
8:40
#20566
Half
13.11 mi13:11:401:54:218:435:54
8:39
#20542
25K
15.53 mi13:33:372:16:188:4621:57
9:03
#20493
30K
18.64 mi14:06:052:48:469:0332:28
10:27
#21121
20M
20.00 mi14:20:013:02:429:0813:56
10:15
#21184
21M
21.00 mi14:31:313:14:129:1511:30
11:30
#21311
35K
21.75 mi14:38:213:21:029:156:50
9:08
#21219
23M
23.00 mi14:50:203:33:019:1611:59
9:34
#21071
24M
24.00 mi15:00:063:42:479:179:46
9:46
#21042
40K
24.85 mi15:08:293:51:109:188:23
9:48
#21003
25.2M
25.20 mi15:12:103:54:519:193:41
10:41
#20972
Finish
26.22 mi15:21:144:03:559:199:04
8:54
#20873
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi218458539853920479(Top 72%)7700(Top 63%)7700(Top 141%)
10K6.21 mi3.10 mi21291+5548210+3298210+32920743(Top 73%)7885(Top 64%)7885(Top 144%)
15K9.32 mi3.11 mi20984+3078034+1768034+17620479(Top 72%)7700(Top 63%)7700(Top 141%)
20K12.43 mi3.11 mi20566+4187796+2387796+23819270(Top 68%)7066(Top 58%)7066(Top 129%)
Half13.11 mi0.68 mi20542+247780+167780+1620116(Top 71%)7556(Top 62%)7556(Top 138%)
25K15.53 mi2.42 mi20493+497770+107770+1020162(Top 71%)7629(Top 62%)7629(Top 139%)
30K18.64 mi3.11 mi21121-6288152-3828152-38222824(Top 80%)9223(Top 75%)9223(Top 169%)
20M20.00 mi1.36 mi21184-638209-578209-5721730(Top 77%)8749(Top 72%)8749(Top 160%)
21M21.00 mi1.00 mi21311-1278290-818290-8122614(Top 80%)9303(Top 76%)9303(Top 170%)
35K21.75 mi0.75 mi21219+928256+348256+3418925(Top 67%)7422(Top 61%)7422(Top 136%)
23M23.00 mi1.25 mi21071+1488200+568200+5618993(Top 67%)7516(Top 61%)7516(Top 137%)
24M24.00 mi1.00 mi21042+298212-128212-1220624(Top 73%)8405(Top 69%)8405(Top 154%)
40K24.85 mi0.85 mi21003+398209+38209+319846(Top 70%)8070(Top 66%)8070(Top 148%)
25.2M25.20 mi0.35 mi20972+318195+148195+1419703(Top 69%)8014(Top 66%)8014(Top 147%)
Finish26.22 mi1.02 mi20873+998156+398156+3918548(Top 65%)7362(Top 60%)7362(Top 135%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 72%
×21story building
+97ft-345ft

Overall

20479

Females

7700

F18-39

7700

5K→10K

3.1 - 6.2 mi

Top 73%
×5story building
+79ft-138ft

Overall

20743

Females

7885

F18-39

7885

10K→15K

6.2 - 9.3 mi

Top 72%
×3story building
+67ft-78ft

Overall

20479

Females

7700

F18-39

7700

15K→20K

9.3 - 12.4 mi

Top 68%
×5story building
+106ft-86ft

Overall

19270

Females

7066

F18-39

7066

20K→Half

12.4 - 13.1 mi

Top 71%
×2story building
+19ft-37ft

Overall

20116

Females

7556

F18-39

7556

Half→25K

13.1 - 15.5 mi

Top 71%
×4story building
+66ft-88ft

Overall

20162

Females

7629

F18-39

7629

25K→30K

15.5 - 18.6 mi

Top 80%
×9story building
+181ft-148ft

Overall

22824

Females

9223

F18-39

9223

30K→20M

18.6 - 20.0 mi

Top 77%
×5story building
+64ft-50ft

Overall

21730

Females

8749

F18-39

8749

20M→21M

20.0 - 21.0 mi

Top 80%
×8story building
+106ft-24ft

Overall

22614

Females

9303

F18-39

9303

21M→35K

21.0 - 21.8 mi

Top 67%
×7story building
+17ft-86ft

Overall

18925

Females

7422

F18-39

7422

35K→23M

21.8 - 23.0 mi

Top 67%
×5story building
+23ft-63ft

Overall

18993

Females

7516

F18-39

7516

23M→24M

23.0 - 24.0 mi

Top 73%
×6story building
+12ft-82ft

Overall

20624

Females

8405

F18-39

8405

24M→40K

24.0 - 24.9 mi

Top 70%
×1story
+6ft-20ft

Overall

19846

Females

8070

F18-39

8070

40K→25.2M

24.9 - 25.2 mi

Top 69%
×1story
+13ft-16ft

Overall

19703

Females

8014

F18-39

8014

25.2M→Finish

25.2 - 26.2 mi

Top 65%
×2story building
+22ft-21ft

Overall

18548

Females

7362

F18-39

7362

Passing Analysis

Category:
Athletes Passed
2437
Passed By
1465
Net Change
+972
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21845
5K → 10K63985+554#21845#21291
10K → 15K37770+307#21291#20984
15K → 20K43719+418#20984#20566
20K → Half5026+24#20566#20542
Half → 25K167118+49#20542#20493
25K → 30K76704-628#20493#21121
30K → 20M86149-63#21121#21184
20M → 21M50177-127#21184#21311
21M → 35K1008+92#21311#21219
35K → 23M17325+148#21219#21071
23M → 24M7243+29#21071#21042
24M → 40K6526+39#21042#21003
40K → 25.2M4413+31#21003#20972
25.2M → Finish1012+99#20972#20873
TOTALS24371465+972
📊

Passing Visuals

Category:
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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