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BOSTON MARATHON 2025

Chuk Man Chou

Bib: 21009 F HK

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Top 42%
Division (F40-44)
#0 / 1718
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
8:01/mi
24:53
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
8:06/mi
50:02
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
8:14/mi
1:15:37
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
8:29/mi
1:41:57
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
8:26/mi
1:47:42
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
8:37/mi
2:08:36
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
8:56/mi
2:36:21
↑ 181↓ 1480.2%
138 ft elev
20M
9:07/mi
2:48:44
↑ 64↓ 500.2%
148 ft elev
21M
9:49/mi
2:58:33
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
9:05/mi
3:05:21
↑ 17↓ 861.7%
156 ft elev
23M
9:32/mi
3:17:17
↑ 23↓ 630.6%
116 ft elev
24M
9:25/mi
3:26:42
↓ 821.3%
34 ft elev
40K· 24.85 mi
9:34/mi
3:34:53
↓ 200.3%
20 ft elev
25.2M
10:06/mi
3:38:22
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
9:06/mi
3:47:38
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:47:42
Pace8:13 /mi
2nd Half
Distance13.11 mi
Time1:59:56
Pace9:09 /mi
📊Positive Split: 11.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:17:4824:538:0124:53
8:01
-
10K
6.21 mi11:42:5750:028:0325:09
8:06
+0:05
15K
9.32 mi12:08:321:15:378:0725:35
8:14
+0:08
20K
12.43 mi12:34:521:41:578:1226:20
8:29
+0:15
Half
13.11 mi12:40:371:47:428:135:45
8:26
-0:03
25K
15.53 mi13:01:312:08:368:1720:54
8:37
+0:11
30K
18.64 mi13:29:162:36:218:2327:45
8:56
+0:19
20M
20.00 mi13:41:392:48:448:2612:23
9:07
+0:11
21M
21.00 mi13:51:282:58:338:309:49
9:49
+0:42
35K
21.75 mi13:58:163:05:218:316:48
9:05
-0:44
23M
23.00 mi14:10:123:17:178:3511:56
9:32
+0:27
24M
24.00 mi14:19:373:26:428:379:25
9:25
-0:07
40K
24.85 mi14:27:483:34:538:398:11
9:34
+0:09
25.2M
25.20 mi14:31:173:38:228:403:29
10:06
+0:32
Finish
26.22 mi14:40:333:47:388:419:16
9:06
-1:00

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

8:01 /mi

Average Pace

8:41 /mi

Slowest Pace

10:06 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:08:36

56% of race

Time at Steady Pace

56:12

25% of race

Time at Slower Pace

42:50

19% of race

Average Pace: 8:41 /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 mi11:17:4824:538:0124:53
8:01
#16677
10K
6.21 mi11:42:5750:028:0325:09
8:06
#16928
15K
9.32 mi12:08:321:15:378:0725:35
8:14
#17180
20K
12.43 mi12:34:521:41:578:1226:20
8:29
#17372
Half
13.11 mi12:40:371:47:428:135:45
8:26
#17436
25K
15.53 mi13:01:312:08:368:1720:54
8:37
#17476
30K
18.64 mi13:29:162:36:218:2327:45
8:56
#17394
20M
20.00 mi13:41:392:48:448:2612:23
9:07
#17371
21M
21.00 mi13:51:282:58:338:309:49
9:49
#17376
35K
21.75 mi13:58:163:05:218:316:48
9:05
#17426
23M
23.00 mi14:10:123:17:178:3511:56
9:32
#17528
24M
24.00 mi14:19:373:26:428:379:25
9:25
#17617
40K
24.85 mi14:27:483:34:538:398:11
9:34
#17678
25.2M
25.20 mi14:31:173:38:228:403:29
10:06
#17660
Finish
26.22 mi14:40:333:47:388:419:16
9:06
#17751
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi166775563556317620(Top 62%)6092(Top 50%)6092(Top 355%)
10K6.21 mi3.10 mi16928-2515680-1175680-11717176(Top 60%)5806(Top 47%)5806(Top 338%)
15K9.32 mi3.11 mi17180-2525817-1375817-13717620(Top 62%)6092(Top 50%)6092(Top 355%)
20K12.43 mi3.11 mi17372-1925960-1435960-14318074(Top 64%)6384(Top 52%)6384(Top 372%)
Half13.11 mi0.68 mi17436-646001-416001-4118767(Top 66%)6761(Top 55%)6761(Top 394%)
25K15.53 mi2.42 mi17476-406046-456046-4517935(Top 63%)6393(Top 52%)6393(Top 372%)
30K18.64 mi3.11 mi17394+826057-116057-1117331(Top 61%)6208(Top 51%)6208(Top 361%)
20M20.00 mi1.36 mi17371+236065-86065-817386(Top 61%)6359(Top 52%)6359(Top 370%)
21M21.00 mi1.00 mi17376-56102-376102-3717569(Top 62%)6568(Top 54%)6568(Top 382%)
35K21.75 mi0.75 mi17426-506152-506152-5018676(Top 66%)7284(Top 60%)7284(Top 424%)
23M23.00 mi1.25 mi17528-1026240-886240-8818843(Top 66%)7422(Top 61%)7422(Top 432%)
24M24.00 mi1.00 mi17617-896316-766316-7619311(Top 68%)7708(Top 63%)7708(Top 449%)
40K24.85 mi0.85 mi17678-616379-636379-6319003(Top 67%)7628(Top 62%)7628(Top 444%)
25.2M25.20 mi0.35 mi17660+186374+56374+517511(Top 62%)6865(Top 56%)6865(Top 400%)
Finish26.22 mi1.02 mi17751-916438-646438-6419504(Top 69%)7862(Top 64%)7862(Top 458%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 62%
×21story building
+97ft-345ft

Overall

17620

Females

6092

F40-44

6092

5K→10K

3.1 - 6.2 mi

Top 60%
×5story building
+79ft-138ft

Overall

17176

Females

5806

F40-44

5806

10K→15K

6.2 - 9.3 mi

Top 62%
×3story building
+67ft-78ft

Overall

17620

Females

6092

F40-44

6092

15K→20K

9.3 - 12.4 mi

Top 64%
×5story building
+106ft-86ft

Overall

18074

Females

6384

F40-44

6384

20K→Half

12.4 - 13.1 mi

Top 66%
×2story building
+19ft-37ft

Overall

18767

Females

6761

F40-44

6761

Half→25K

13.1 - 15.5 mi

Top 63%
×4story building
+66ft-88ft

Overall

17935

Females

6393

F40-44

6393

25K→30K

15.5 - 18.6 mi

Top 61%
×9story building
+181ft-148ft

Overall

17331

Females

6208

F40-44

6208

30K→20M

18.6 - 20.0 mi

Top 61%
×5story building
+64ft-50ft

Overall

17386

Females

6359

F40-44

6359

20M→21M

20.0 - 21.0 mi

Top 62%
×8story building
+106ft-24ft

Overall

17569

Females

6568

F40-44

6568

21M→35K

21.0 - 21.8 mi

Top 66%
×7story building
+17ft-86ft

Overall

18676

Females

7284

F40-44

7284

35K→23M

21.8 - 23.0 mi

Top 66%
×5story building
+23ft-63ft

Overall

18843

Females

7422

F40-44

7422

23M→24M

23.0 - 24.0 mi

Top 68%
×6story building
+12ft-82ft

Overall

19311

Females

7708

F40-44

7708

24M→40K

24.0 - 24.9 mi

Top 67%
×1story
+6ft-20ft

Overall

19003

Females

7628

F40-44

7628

40K→25.2M

24.9 - 25.2 mi

Top 62%
×1story
+13ft-16ft

Overall

17511

Females

6865

F40-44

6865

25.2M→Finish

25.2 - 26.2 mi

Top 69%
×2story building
+22ft-21ft

Overall

19504

Females

7862

F40-44

7862

Passing Analysis

Category:
Athletes Passed
1407
Passed By
2481
Net Change
-1074
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#16677
5K → 10K192443-251#16677#16928
10K → 15K115367-252#16928#17180
15K → 20K131323-192#17180#17372
20K → Half1579-64#17372#17436
Half → 25K163203-40#17436#17476
25K → 30K255173+82#17476#17394
30K → 20M12299+23#17394#17371
20M → 21M98103-5#17371#17376
21M → 35K58108-50#17376#17426
35K → 23M86188-102#17426#17528
23M → 24M49138-89#17528#17617
24M → 40K43104-61#17617#17678
40K → 25.2M4123+18#17678#17660
25.2M → Finish39130-91#17660#17751
TOTALS14072481-1074
📊

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