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BOSTON MARATHON 2025

David Cai

Bib: 705•M

CA

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 2%
Gender (Male)
#0 / 16105
Top 4%
Division (M18-39)
#0 / 5642
Top 9%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
17:50
Rank: #497
Start → 5K
17:50 | 5:44/mi
10K· 6.21 mi
35:29
Rank: #454 (+43)
5K → 10K
17:39 | 5:41/mi
15K· 9.32 mi
53:23
Rank: #463 (-9)
10K → 15K
17:54 | 5:46/mi
20K· 12.43 mi
1:11:23
Rank: #445 (+18)
15K → 20K
18:00 | 5:48/mi
Half· 13.11 mi
1:15:13
Rank: #433 (+12)
20K → Half
3:50 | 5:37/mi
25K· 15.53 mi
1:29:23
Rank: #431 (+2)
Half → 25K
14:10 | 5:51/mi
30K· 18.64 mi
1:48:26
Rank: #465 (-34)
25K → 30K
19:03 | 6:08/mi
20M
1:56:46
Rank: #464 (+1)
30K → 20M
8:20 | 6:08/mi
21M
2:03:24
Rank: #459 (+5)
20M → 21M
6:38 | 6:38/mi
35K· 21.75 mi
2:07:59
Rank: #474 (-15)
21M → 35K
4:35 | 6:08/mi
23M
2:16:12
Rank: #506 (-32)
35K → 23M
8:13 | 6:34/mi
24M
2:22:36
Rank: #532 (-26)
23M → 24M
6:24 | 6:24/mi
40K· 24.85 mi
2:28:23
Rank: #565 (-33)
24M → 40K
5:47 | 6:46/mi
25.2M
2:30:56
Rank: #579 (-14)
40K → 25.2M
2:33 | 7:24/mi
Finish· 26.22 mi
2:37:36
Rank: #612 (-33)
25.2M → Finish
6:40 | 6:33/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:15:13
Pace5:44 /mi
2nd Half
Distance13.11 mi
Time1:22:23
Pace6:17 /mi
📊Positive Split: 9.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:18:0217:505:4417:50
5:44
-
10K
6.21 mi10:35:4135:295:4317:39
5:41
-0:03
15K
9.32 mi10:53:3553:235:4417:54
5:46
+0:05
20K
12.43 mi11:11:351:11:235:4518:00
5:48
+0:02
Half
13.11 mi11:15:251:15:135:443:50
5:37
-0:11
25K
15.53 mi11:29:351:29:235:4514:10
5:51
+0:14
30K
18.64 mi11:48:381:48:265:4919:03
6:08
+0:17
20M
20.00 mi11:56:581:56:465:508:20
6:08
0:00
21M
21.00 mi12:03:362:03:245:536:38
6:38
+0:30
35K
21.75 mi12:08:112:07:595:534:35
6:08
-0:30
23M
23.00 mi12:16:242:16:125:558:13
6:34
+0:26
24M
24.00 mi12:22:482:22:365:576:24
6:24
-0:10
40K
24.85 mi12:28:352:28:235:585:47
6:46
+0:22
25.2M
25.20 mi12:31:082:30:565:592:33
7:24
+0:38
Finish
26.22 mi12:37:482:37:366:016:40
6:33
-0:51

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

5:37 /mi

Average Pace

6:01 /mi

Slowest Pace

7:24 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:29:23

57% of race

Time at Steady Pace

31:58

20% of race

Time at Slower Pace

36:15

23% of race

Average Pace: 6:01 /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 mi10:18:0217:505:4417:50
5:44
#497
10K
6.21 mi10:35:4135:295:4317:39
5:41
#454
15K
9.32 mi10:53:3553:235:4417:54
5:46
#463
20K
12.43 mi11:11:351:11:235:4518:00
5:48
#445
Half
13.11 mi11:15:251:15:135:443:50
5:37
#433
25K
15.53 mi11:29:351:29:235:4514:10
5:51
#431
30K
18.64 mi11:48:381:48:265:4919:03
6:08
#465
20M
20.00 mi11:56:581:56:465:508:20
6:08
#464
21M
21.00 mi12:03:362:03:245:536:38
6:38
#459
35K
21.75 mi12:08:112:07:595:534:35
6:08
#474
23M
23.00 mi12:16:242:16:125:558:13
6:34
#506
24M
24.00 mi12:22:482:22:365:576:24
6:24
#532
40K
24.85 mi12:28:352:28:235:585:47
6:46
#565
25.2M
25.20 mi12:31:082:30:565:592:33
7:24
#579
Finish
26.22 mi12:37:482:37:366:016:40
6:33
#612
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi497459459469(Top 2%)435(Top 3%)435(Top 8%)
10K6.21 mi3.10 mi454+43417+42417+42411(Top 1%)379(Top 2%)379(Top 7%)
15K9.32 mi3.11 mi463-9426-9426-9469(Top 2%)435(Top 3%)435(Top 8%)
20K12.43 mi3.11 mi445+18411+15411+15438(Top 2%)407(Top 3%)407(Top 7%)
Half13.11 mi0.68 mi433+12399+12399+12339(Top 1%)313(Top 2%)313(Top 6%)
25K15.53 mi2.42 mi431+2397+2397+2480(Top 2%)447(Top 3%)447(Top 8%)
30K18.64 mi3.11 mi465-34430-33430-33747(Top 3%)699(Top 4%)699(Top 12%)
20M20.00 mi1.36 mi464+1429+1429+1591(Top 2%)557(Top 3%)557(Top 10%)
21M21.00 mi1.00 mi459+5423+6423+6996(Top 4%)941(Top 6%)941(Top 17%)
35K21.75 mi0.75 mi474-15436-13436-13995(Top 4%)936(Top 6%)936(Top 17%)
23M23.00 mi1.25 mi506-32465-29465-291661(Top 6%)1550(Top 10%)1550(Top 27%)
24M24.00 mi1.00 mi532-26489-24489-241632(Top 6%)1519(Top 9%)1519(Top 27%)
40K24.85 mi0.85 mi565-33520-31520-312635(Top 9%)2392(Top 15%)2392(Top 42%)
25.2M25.20 mi0.35 mi579-14534-14534-142837(Top 10%)2516(Top 16%)2516(Top 45%)
Finish26.22 mi1.02 mi612-33564-30564-302992(Top 11%)2660(Top 17%)2660(Top 47%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 2%
×21stories
+97ft-345ft

Overall

469

Males

435

M18-39

435

5K→10K

3.1 - 6.2 mi

Top 1%
×5stories
+79ft-138ft

Overall

411

Males

379

M18-39

379

10K→15K

6.2 - 9.3 mi

Top 2%
×3stories
+67ft-78ft

Overall

469

Males

435

M18-39

435

15K→20K

9.3 - 12.4 mi

Top 2%
×5stories
+106ft-86ft

Overall

438

Males

407

M18-39

407

20K→Half

12.4 - 13.1 mi

Top 1%
×2stories
+19ft-37ft

Overall

339

Males

313

M18-39

313

Half→25K

13.1 - 15.5 mi

Top 2%
×4stories
+66ft-88ft

Overall

480

Males

447

M18-39

447

25K→30K

15.5 - 18.6 mi

Top 3%
×9stories
+181ft-148ft

Overall

747

Males

699

M18-39

699

30K→20M

18.6 - 20.0 mi

Top 2%
×5stories
+64ft-50ft

Overall

591

Males

557

M18-39

557

20M→21M

20.0 - 21.0 mi

Top 4%
×8stories
+106ft-24ft

Overall

996

Males

941

M18-39

941

21M→35K

21.0 - 21.8 mi

Top 4%
×7stories
+17ft-86ft

Overall

995

Males

936

M18-39

936

35K→23M

21.8 - 23.0 mi

Top 6%
×5stories
+23ft-63ft

Overall

1661

Males

1550

M18-39

1550

23M→24M

23.0 - 24.0 mi

Top 6%
×6stories
+12ft-82ft

Overall

1632

Males

1519

M18-39

1519

24M→40K

24.0 - 24.9 mi

Top 9%
×1story
+6ft-20ft

Overall

2635

Males

2392

M18-39

2392

40K→25.2M

24.9 - 25.2 mi

Top 10%
×1story
+13ft-16ft

Overall

2837

Males

2516

M18-39

2516

25.2M→Finish

25.2 - 26.2 mi

Top 11%
×2stories
+22ft-21ft

Overall

2992

Males

2660

M18-39

2660

Passing Analysis

Category:
Athletes Passed
182
Passed By
297
Net Change
-115
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#497
5K → 10K5310+43#497#454
10K → 15K1625-9#454#463
15K → 20K3214+18#463#445
20K → Half131+12#445#433
Half → 25K1311+2#433#431
25K → 30K1246-34#431#465
30K → 20M87+1#465#464
20M → 21M149+5#464#459
21M → 35K217-15#459#474
35K → 23M840-32#474#506
23M → 24M329-26#506#532
24M → 40K235-33#532#565
40K → 25.2M014-14#565#579
25.2M → Finish639-33#579#612
TOTALS182297-115
📊

Passing Visuals

Category:

📈Position Graph

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🎨Heatmap Timeline

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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