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BOSTON MARATHON 2025

Lai Kam Amy Yan

Bib: 21955•F

MA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F55-59)
#0 / 994
Top 37%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
8:14/mi
25:36
↑ 97↓ 3451.5%
10K· 6.21 mi
8:22/mi
51:37
↑ 79↓ 1380.4%
15K· 9.32 mi
8:30/mi
1:18:03
↑ 67↓ 78
20K· 12.43 mi
8:43/mi
1:45:08
↑ 106↓ 860.1%
Half· 13.11 mi
8:39/mi
1:51:02
↑ 19↓ 370.5%
25K· 15.53 mi
9:01/mi
2:12:54
↑ 66↓ 880.2%
30K· 18.64 mi
9:14/mi
2:41:35
↑ 181↓ 1480.2%
20M
9:43/mi
2:54:47
↑ 64↓ 500.2%
21M
10:28/mi
3:05:15
↑ 106↓ 241.6%
35K· 21.75 mi
9:35/mi
3:12:25
↑ 17↓ 861.7%
23M
9:40/mi
3:24:31
↑ 23↓ 630.6%
24M
9:24/mi
3:33:55
↓ 821.3%
40K· 24.85 mi
9:48/mi
3:42:18
↓ 200.3%
25.2M
10:38/mi
3:45:58
↑ 13↓ 160.2%
Finish· 26.22 mi
9:20/mi
3:55:29
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:51:02
Pace8:28 /mi
2nd Half
Distance13.11 mi
Time2:04:27
Pace9:30 /mi
📊Positive Split: 12.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:20:0425:368:1425:36
8:14
-
10K
6.21 mi11:46:0551:378:1826:01
8:22
+0:08
15K
9.32 mi12:12:311:18:038:2226:26
8:30
+0:08
20K
12.43 mi12:39:361:45:088:2827:05
8:43
+0:13
Half
13.11 mi12:45:301:51:028:285:54
8:39
-0:04
25K
15.53 mi13:07:222:12:548:3321:52
9:01
+0:22
30K
18.64 mi13:36:032:41:358:4028:41
9:14
+0:13
20M
20.00 mi13:49:152:54:478:4413:12
9:43
+0:29
21M
21.00 mi13:59:433:05:158:4910:28
10:28
+0:45
35K
21.75 mi14:06:533:12:258:517:10
9:35
-0:53
23M
23.00 mi14:18:593:24:318:5412:06
9:40
+0:05
24M
24.00 mi14:28:233:33:558:559:24
9:24
-0:16
40K
24.85 mi14:36:463:42:188:578:23
9:48
+0:24
25.2M
25.20 mi14:40:263:45:588:583:40
10:38
+0:50
Finish
26.22 mi14:49:573:55:298:599:31
9:20
-1:18

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

8:14 /mi

Average Pace

8:59 /mi

Slowest Pace

10:38 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:51:02

47% of race

Time at Steady Pace

1:28:44

38% of race

Time at Slower Pace

35:43

15% of race

Average Pace: 8:59 /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 mi11:20:0425:368:1425:36
8:14
#18369
10K
6.21 mi11:46:0551:378:1826:01
8:22
#18668
15K
9.32 mi12:12:311:18:038:2226:26
8:30
#18883
20K
12.43 mi12:39:361:45:088:2827:05
8:43
#19017
Half
13.11 mi12:45:301:51:028:285:54
8:39
#19058
25K
15.53 mi13:07:222:12:548:3321:52
9:01
#19235
30K
18.64 mi13:36:032:41:358:4028:41
9:14
#19161
20M
20.00 mi13:49:152:54:478:4413:12
9:43
#19231
21M
21.00 mi13:59:433:05:158:4910:28
10:28
#19296
35K
21.75 mi14:06:533:12:258:517:10
9:35
#19358
23M
23.00 mi14:18:593:24:318:5412:06
9:40
#19366
24M
24.00 mi14:28:233:33:558:559:24
9:24
#19366
40K
24.85 mi14:36:463:42:188:578:23
9:48
#19383
25.2M
25.20 mi14:40:263:45:588:583:40
10:38
#19384
Finish
26.22 mi14:49:573:55:298:599:31
9:20
#19444
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF55-59Seg. OverallSeg. FemalesSeg. F55-59
5K3.11 mi3.11 mi183696566656619385(Top 68%)7114(Top 58%)7114(Top 716%)
10K6.21 mi3.10 mi18668-2996721-1556721-15519052(Top 67%)6918(Top 57%)6918(Top 696%)
15K9.32 mi3.11 mi18883-2156844-1236844-12319385(Top 68%)7114(Top 58%)7114(Top 716%)
20K12.43 mi3.11 mi19017-1346914-706914-7019514(Top 69%)7212(Top 59%)7212(Top 726%)
Half13.11 mi0.68 mi19058-416940-266940-2620088(Top 71%)7528(Top 62%)7528(Top 757%)
25K15.53 mi2.42 mi19235-1777048-1087048-10819994(Top 70%)7530(Top 62%)7530(Top 758%)
30K18.64 mi3.11 mi19161+747048704818806(Top 66%)7015(Top 57%)7015(Top 706%)
20M20.00 mi1.36 mi19231-707115-677115-6719995(Top 70%)7785(Top 64%)7785(Top 783%)
21M21.00 mi1.00 mi19296-657174-597174-5919910(Top 70%)7858(Top 64%)7858(Top 791%)
35K21.75 mi0.75 mi19358-627224-507224-5020621(Top 73%)8303(Top 68%)8303(Top 835%)
23M23.00 mi1.25 mi19366-87264-407264-4019338(Top 68%)7697(Top 63%)7697(Top 774%)
24M24.00 mi1.00 mi193667292-287292-2819247(Top 68%)7675(Top 63%)7675(Top 772%)
40K24.85 mi0.85 mi19383-177314-227314-2219840(Top 70%)8064(Top 66%)8064(Top 811%)
25.2M25.20 mi0.35 mi19384-17323-97323-919523(Top 69%)7910(Top 65%)7910(Top 796%)
Finish26.22 mi1.02 mi19444-607378-557378-5520552(Top 72%)8419(Top 69%)8419(Top 847%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 68%
×21story building
+97ft-345ft

Overall

19385

Females

7114

F55-59

7114

5K→10K

3.1 - 6.2 mi

Top 67%
×5story building
+79ft-138ft

Overall

19052

Females

6918

F55-59

6918

10K→15K

6.2 - 9.3 mi

Top 68%
×3story building
+67ft-78ft

Overall

19385

Females

7114

F55-59

7114

15K→20K

9.3 - 12.4 mi

Top 69%
×5story building
+106ft-86ft

Overall

19514

Females

7212

F55-59

7212

20K→Half

12.4 - 13.1 mi

Top 71%
×2story building
+19ft-37ft

Overall

20088

Females

7528

F55-59

7528

Half→25K

13.1 - 15.5 mi

Top 70%
×4story building
+66ft-88ft

Overall

19994

Females

7530

F55-59

7530

25K→30K

15.5 - 18.6 mi

Top 66%
×9story building
+181ft-148ft

Overall

18806

Females

7015

F55-59

7015

30K→20M

18.6 - 20.0 mi

Top 70%
×5story building
+64ft-50ft

Overall

19995

Females

7785

F55-59

7785

20M→21M

20.0 - 21.0 mi

Top 70%
×8story building
+106ft-24ft

Overall

19910

Females

7858

F55-59

7858

21M→35K

21.0 - 21.8 mi

Top 73%
×7story building
+17ft-86ft

Overall

20621

Females

8303

F55-59

8303

35K→23M

21.8 - 23.0 mi

Top 68%
×5story building
+23ft-63ft

Overall

19338

Females

7697

F55-59

7697

23M→24M

23.0 - 24.0 mi

Top 68%
×6story building
+12ft-82ft

Overall

19247

Females

7675

F55-59

7675

24M→40K

24.0 - 24.9 mi

Top 70%
×1story
+6ft-20ft

Overall

19840

Females

8064

F55-59

8064

40K→25.2M

24.9 - 25.2 mi

Top 69%
×1story
+13ft-16ft

Overall

19523

Females

7910

F55-59

7910

25.2M→Finish

25.2 - 26.2 mi

Top 72%
×2story building
+22ft-21ft

Overall

20552

Females

8419

F55-59

8419

Passing Analysis

Category:
Athletes Passed
1321
Passed By
2396
Net Change
-1075
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18369
5K → 10K150449-299#18369#18668
10K → 15K120335-215#18668#18883
15K → 20K165299-134#18883#19017
20K → Half1960-41#19017#19058
Half → 25K120297-177#19058#19235
25K → 30K260186+74#19235#19161
30K → 20M83153-70#19161#19231
20M → 21M72137-65#19231#19296
21M → 35K3395-62#19296#19358
35K → 23M97105-8#19358#19366
23M → 24M74740#19366#19366
24M → 40K5572-17#19366#19383
40K → 25.2M3435-1#19383#19384
25.2M → Finish3999-60#19384#19444
TOTALS13212396-1075
📊

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