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BOSTON MARATHON 2025

Sinthy Kounlasa

Bib: 25596•F

NH

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F65-69)
#0 / 222
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
29:03
Rank: #23725
Start → 5K
29:03 | 9:21/mi
10K· 6.21 mi
58:56
Rank: #24134 (-409)
5K → 10K
29:53 | 9:37/mi
15K· 9.32 mi
1:29:36
Rank: #24342 (-208)
10K → 15K
30:40 | 9:52/mi
20K· 12.43 mi
2:01:30
Rank: #24488 (-146)
15K → 20K
31:54 | 10:16/mi
Half· 13.11 mi
2:08:17
Rank: #24490 (-2)
20K → Half
6:47 | 9:57/mi
25K· 15.53 mi
2:35:02
Rank: #24670 (-180)
Half → 25K
26:45 | 11:02/mi
30K· 18.64 mi
3:10:23
Rank: #24678 (-8)
25K → 30K
35:21 | 11:23/mi
20M
3:26:39
Rank: #24747 (-69)
30K → 20M
16:16 | 11:58/mi
21M
3:40:07
Rank: #24817 (-70)
20M → 21M
13:28 | 13:28/mi
35K· 21.75 mi
3:48:05
Rank: #24787 (+30)
21M → 35K
7:58 | 10:39/mi
23M
4:02:40
Rank: #24791 (-4)
35K → 23M
14:35 | 11:39/mi
24M
4:13:45
Rank: #24769 (+22)
23M → 24M
11:05 | 11:05/mi
40K· 24.85 mi
4:23:36
Rank: #24753 (+16)
24M → 40K
9:51 | 11:31/mi
25.2M
4:27:58
Rank: #24750 (+3)
40K → 25.2M
4:22 | 12:40/mi
Finish· 26.22 mi
4:39:19
Rank: #24799 (-49)
25.2M → Finish
11:21 | 11:08/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:08:17
Pace9:47 /mi
2nd Half
Distance13.11 mi
Time2:31:02
Pace11:31 /mi
📊Positive Split: 17.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:44:1229:039:2129:03
9:21
-
10K
6.21 mi12:14:0558:569:2929:53
9:37
+0:16
15K
9.32 mi12:44:451:29:369:3730:40
9:52
+0:15
20K
12.43 mi13:16:392:01:309:4731:54
10:16
+0:24
Half
13.11 mi13:23:262:08:179:476:47
9:57
-0:19
25K
15.53 mi13:50:112:35:029:5926:45
11:02
+1:05
30K
18.64 mi14:25:323:10:2310:1335:21
11:23
+0:21
20M
20.00 mi14:41:483:26:3910:2016:16
11:58
+0:35
21M
21.00 mi14:55:163:40:0710:2913:28
13:28
+1:30
35K
21.75 mi15:03:143:48:0510:297:58
10:39
-2:49
23M
23.00 mi15:17:494:02:4010:3314:35
11:39
+1:00
24M
24.00 mi15:28:544:13:4510:3411:05
11:05
-0:34
40K
24.85 mi15:38:454:23:3610:369:51
11:31
+0:26
25.2M
25.20 mi15:43:074:27:5810:384:22
12:40
+1:09
Finish
26.22 mi15:54:284:39:1910:4011:21
11:08
-1:32

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

9:21 /mi

Average Pace

10:40 /mi

Slowest Pace

13:28 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:08:17

46% of race

Time at Steady Pace

1:42:21

37% of race

Time at Slower Pace

48:41

17% of race

Average Pace: 10:39 /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 mi11:44:1229:039:2129:03
9:21
#23725
10K
6.21 mi12:14:0558:569:2929:53
9:37
#24134
15K
9.32 mi12:44:451:29:369:3730:40
9:52
#24342
20K
12.43 mi13:16:392:01:309:4731:54
10:16
#24488
Half
13.11 mi13:23:262:08:179:476:47
9:57
#24490
25K
15.53 mi13:50:112:35:029:5926:45
11:02
#24670
30K
18.64 mi14:25:323:10:2310:1335:21
11:23
#24678
20M
20.00 mi14:41:483:26:3910:2016:16
11:58
#24747
21M
21.00 mi14:55:163:40:0710:2913:28
13:28
#24817
35K
21.75 mi15:03:143:48:0510:297:58
10:39
#24787
23M
23.00 mi15:17:494:02:4010:3314:35
11:39
#24791
24M
24.00 mi15:28:544:13:4510:3411:05
11:05
#24769
40K
24.85 mi15:38:454:23:3610:369:51
11:31
#24753
25.2M
25.20 mi15:43:074:27:5810:384:22
12:40
#24750
Finish
26.22 mi15:54:284:39:1910:4011:21
11:08
#24799
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF65-69Seg. OverallSeg. FemalesSeg. F65-69
5K3.11 mi3.11 mi237259545954524700(Top 87%)10057(Top 82%)10057(Top 4530%)
10K6.21 mi3.10 mi24134-4099756-2119756-21124397(Top 86%)9913(Top 81%)9913(Top 4465%)
15K9.32 mi3.11 mi24342-2089870-1149870-11424700(Top 87%)10057(Top 82%)10057(Top 4530%)
20K12.43 mi3.11 mi24488-1469969-999969-9924766(Top 87%)10136(Top 83%)10136(Top 4566%)
Half13.11 mi0.68 mi24490-29971-29971-224680(Top 87%)10102(Top 83%)10102(Top 4550%)
25K15.53 mi2.42 mi24670-18010070-9910070-9925245(Top 89%)10435(Top 85%)10435(Top 4700%)
30K18.64 mi3.11 mi24678-810102-3210102-3224657(Top 87%)10214(Top 84%)10214(Top 4601%)
20M20.00 mi1.36 mi24747-6910156-5410156-5425203(Top 89%)10583(Top 87%)10583(Top 4767%)
21M21.00 mi1.00 mi24817-7010203-4710203-4725623(Top 90%)10867(Top 89%)10867(Top 4895%)
35K21.75 mi0.75 mi24787+3010197+610197+623447(Top 83%)9779(Top 80%)9779(Top 4405%)
23M23.00 mi1.25 mi24791-410213-1610213-1624493(Top 86%)10345(Top 85%)10345(Top 4660%)
24M24.00 mi1.00 mi24769+2210219-610219-624143(Top 85%)10192(Top 83%)10192(Top 4591%)
40K24.85 mi0.85 mi24753+1610225-610225-624152(Top 85%)10243(Top 84%)10243(Top 4614%)
25.2M25.20 mi0.35 mi24750+310227-210227-224444(Top 86%)10402(Top 85%)10402(Top 4686%)
Finish26.22 mi1.02 mi24799-4910260-3310260-3325598(Top 90%)10955(Top 90%)10955(Top 4935%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 87%
×21stories
+97ft-345ft

Overall

24700

Females

10057

F65-69

10057

5K→10K

3.1 - 6.2 mi

Top 86%
×5stories
+79ft-138ft

Overall

24397

Females

9913

F65-69

9913

10K→15K

6.2 - 9.3 mi

Top 87%
×3stories
+67ft-78ft

Overall

24700

Females

10057

F65-69

10057

15K→20K

9.3 - 12.4 mi

Top 87%
×5stories
+106ft-86ft

Overall

24766

Females

10136

F65-69

10136

20K→Half

12.4 - 13.1 mi

Top 87%
×2stories
+19ft-37ft

Overall

24680

Females

10102

F65-69

10102

Half→25K

13.1 - 15.5 mi

Top 89%
×4stories
+66ft-88ft

Overall

25245

Females

10435

F65-69

10435

25K→30K

15.5 - 18.6 mi

Top 87%
×9stories
+181ft-148ft

Overall

24657

Females

10214

F65-69

10214

30K→20M

18.6 - 20.0 mi

Top 89%
×5stories
+64ft-50ft

Overall

25203

Females

10583

F65-69

10583

20M→21M

20.0 - 21.0 mi

Top 90%
×8stories
+106ft-24ft

Overall

25623

Females

10867

F65-69

10867

21M→35K

21.0 - 21.8 mi

Top 83%
×7stories
+17ft-86ft

Overall

23447

Females

9779

F65-69

9779

35K→23M

21.8 - 23.0 mi

Top 86%
×5stories
+23ft-63ft

Overall

24493

Females

10345

F65-69

10345

23M→24M

23.0 - 24.0 mi

Top 85%
×6stories
+12ft-82ft

Overall

24143

Females

10192

F65-69

10192

24M→40K

24.0 - 24.9 mi

Top 85%
×1story
+6ft-20ft

Overall

24152

Females

10243

F65-69

10243

40K→25.2M

24.9 - 25.2 mi

Top 86%
×1story
+13ft-16ft

Overall

24444

Females

10402

F65-69

10402

25.2M→Finish

25.2 - 26.2 mi

Top 90%
×2stories
+22ft-21ft

Overall

25598

Females

10955

F65-69

10955

Passing Analysis

Category:
Athletes Passed
772
Passed By
1846
Net Change
-1074
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23725
5K → 10K97506-409#23725#24134
10K → 15K78286-208#24134#24342
15K → 20K91237-146#24342#24488
20K → Half2426-2#24488#24490
Half → 25K52232-180#24490#24670
25K → 30K131139-8#24670#24678
30K → 20M43112-69#24678#24747
20M → 21M2696-70#24747#24817
21M → 35K4919+30#24817#24787
35K → 23M4852-4#24787#24791
23M → 24M5432+22#24791#24769
24M → 40K3721+16#24769#24753
40K → 25.2M2017+3#24753#24750
25.2M → Finish2271-49#24750#24799
TOTALS7721846-1074
📊

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