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BOSTON MARATHON 2025

Kun Song

Bib: 13676•M

MA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M45-49)
#0 / 2386
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:30
Rank: #12786
Start → 5K
23:30 | 7:34/mi
10K· 6.21 mi
47:21
Rank: #13212 (-426)
5K → 10K
23:51 | 7:41/mi
15K· 9.32 mi
1:11:34
Rank: #13561 (-349)
10K → 15K
24:13 | 7:48/mi
20K· 12.43 mi
1:36:26
Rank: #13896 (-335)
15K → 20K
24:52 | 8:00/mi
Half· 13.11 mi
1:41:53
Rank: #14012 (-116)
20K → Half
5:27 | 7:59/mi
25K· 15.53 mi
2:02:06
Rank: #14382 (-370)
Half → 25K
20:13 | 8:20/mi
30K· 18.64 mi
2:29:59
Rank: #15110 (-728)
25K → 30K
27:53 | 8:58/mi
20M
2:42:22
Rank: #15273 (-163)
30K → 20M
12:23 | 9:07/mi
21M
2:52:14
Rank: #15403 (-130)
20M → 21M
9:52 | 9:52/mi
35K· 21.75 mi
2:58:37
Rank: #15405 (-2)
21M → 35K
6:23 | 8:32/mi
23M
3:09:54
Rank: #15435 (-30)
35K → 23M
11:17 | 9:01/mi
24M
3:18:32
Rank: #15407 (+28)
23M → 24M
8:38 | 8:38/mi
40K· 24.85 mi
3:25:54
Rank: #15337 (+70)
24M → 40K
7:22 | 8:37/mi
25.2M
3:29:13
Rank: #15331 (+6)
40K → 25.2M
3:19 | 9:37/mi
Finish· 26.22 mi
3:37:42
Rank: #15311 (+20)
25.2M → Finish
8:29 | 8:19/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:41:53
Pace7:46 /mi
2nd Half
Distance13.11 mi
Time1:55:49
Pace8:50 /mi
📊Positive Split: 13.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:53:0323:307:3423:30
7:34
-
10K
6.21 mi11:16:5447:217:3723:51
7:41
+0:07
15K
9.32 mi11:41:071:11:347:4124:13
7:48
+0:07
20K
12.43 mi12:05:591:36:267:4624:52
8:00
+0:12
Half
13.11 mi12:11:261:41:537:465:27
7:59
-0:01
25K
15.53 mi12:31:392:02:067:5220:13
8:20
+0:21
30K
18.64 mi12:59:322:29:598:0327:53
8:58
+0:38
20M
20.00 mi13:11:552:42:228:0712:23
9:07
+0:09
21M
21.00 mi13:21:472:52:148:129:52
9:52
+0:45
35K
21.75 mi13:28:102:58:378:136:23
8:32
-1:20
23M
23.00 mi13:39:273:09:548:1511:17
9:01
+0:29
24M
24.00 mi13:48:053:18:328:168:38
8:38
-0:23
40K
24.85 mi13:55:273:25:548:177:22
8:37
-0:01
25.2M
25.20 mi13:58:463:29:138:183:19
9:37
+1:00
Finish
26.22 mi14:07:153:37:428:198:29
8:19
-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

7:34 /mi

Average Pace

8:19 /mi

Slowest Pace

9:52 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:41:53

47% of race

Time at Steady Pace

51:05

23% of race

Time at Slower Pace

1:04:44

30% of race

Average Pace: 8:18 /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 mi10:53:0323:307:3423:30
7:34
#12786
10K
6.21 mi11:16:5447:217:3723:51
7:41
#13212
15K
9.32 mi11:41:071:11:347:4124:13
7:48
#13561
20K
12.43 mi12:05:591:36:267:4624:52
8:00
#13896
Half
13.11 mi12:11:261:41:537:465:27
7:59
#14012
25K
15.53 mi12:31:392:02:067:5220:13
8:20
#14382
30K
18.64 mi12:59:322:29:598:0327:53
8:58
#15110
20M
20.00 mi13:11:552:42:228:0712:23
9:07
#15273
21M
21.00 mi13:21:472:52:148:129:52
9:52
#15403
35K
21.75 mi13:28:102:58:378:136:23
8:32
#15405
23M
23.00 mi13:39:273:09:548:1511:17
9:01
#15435
24M
24.00 mi13:48:053:18:328:168:38
8:38
#15407
40K
24.85 mi13:55:273:25:548:177:22
8:37
#15337
25.2M
25.20 mi13:58:463:29:138:183:19
9:37
#15331
Finish
26.22 mi14:07:153:37:428:198:29
8:19
#15311
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi127869554955414314(Top 50%)10061(Top 62%)10061(Top 422%)
10K6.21 mi3.10 mi13212-4269708-1549708-15413669(Top 48%)9870(Top 61%)9870(Top 414%)
15K9.32 mi3.11 mi13561-3499800-929800-9214314(Top 50%)10061(Top 62%)10061(Top 422%)
20K12.43 mi3.11 mi13896-3359907-1079907-10714953(Top 53%)10290(Top 64%)10290(Top 431%)
Half13.11 mi0.68 mi14012-1169964-579964-5715757(Top 55%)10675(Top 66%)10675(Top 447%)
25K15.53 mi2.42 mi14382-37010075-11110075-11116149(Top 57%)10702(Top 66%)10702(Top 449%)
30K18.64 mi3.11 mi15110-72810336-26110336-26117540(Top 62%)11162(Top 69%)11162(Top 468%)
20M20.00 mi1.36 mi15273-16310380-4410380-4417350(Top 61%)10959(Top 68%)10959(Top 459%)
21M21.00 mi1.00 mi15403-13010408-2810408-2817748(Top 62%)11034(Top 69%)11034(Top 462%)
35K21.75 mi0.75 mi15405-210386+2210386+2215641(Top 55%)10009(Top 62%)10009(Top 419%)
23M23.00 mi1.25 mi15435-3010356+3010356+3016308(Top 57%)10196(Top 63%)10196(Top 427%)
24M24.00 mi1.00 mi15407+2810319+3710319+3715337(Top 54%)9732(Top 60%)9732(Top 408%)
40K24.85 mi0.85 mi15337+7010257+6210257+6214140(Top 50%)9067(Top 56%)9067(Top 380%)
25.2M25.20 mi0.35 mi15331+610244+1310244+1315134(Top 53%)9473(Top 59%)9473(Top 397%)
Finish26.22 mi1.02 mi15311+2010216+2810216+2815054(Top 53%)9504(Top 59%)9504(Top 398%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 50%
×21stories
+97ft-345ft

Overall

14314

Males

10061

M45-49

10061

5K→10K

3.1 - 6.2 mi

Top 48%
×5stories
+79ft-138ft

Overall

13669

Males

9870

M45-49

9870

10K→15K

6.2 - 9.3 mi

Top 50%
×3stories
+67ft-78ft

Overall

14314

Males

10061

M45-49

10061

15K→20K

9.3 - 12.4 mi

Top 53%
×5stories
+106ft-86ft

Overall

14953

Males

10290

M45-49

10290

20K→Half

12.4 - 13.1 mi

Top 55%
×2stories
+19ft-37ft

Overall

15757

Males

10675

M45-49

10675

Half→25K

13.1 - 15.5 mi

Top 57%
×4stories
+66ft-88ft

Overall

16149

Males

10702

M45-49

10702

25K→30K

15.5 - 18.6 mi

Top 62%
×9stories
+181ft-148ft

Overall

17540

Males

11162

M45-49

11162

30K→20M

18.6 - 20.0 mi

Top 61%
×5stories
+64ft-50ft

Overall

17350

Males

10959

M45-49

10959

20M→21M

20.0 - 21.0 mi

Top 62%
×8stories
+106ft-24ft

Overall

17748

Males

11034

M45-49

11034

21M→35K

21.0 - 21.8 mi

Top 55%
×7stories
+17ft-86ft

Overall

15641

Males

10009

M45-49

10009

35K→23M

21.8 - 23.0 mi

Top 57%
×5stories
+23ft-63ft

Overall

16308

Males

10196

M45-49

10196

23M→24M

23.0 - 24.0 mi

Top 54%
×6stories
+12ft-82ft

Overall

15337

Males

9732

M45-49

9732

24M→40K

24.0 - 24.9 mi

Top 50%
×1story
+6ft-20ft

Overall

14140

Males

9067

M45-49

9067

40K→25.2M

24.9 - 25.2 mi

Top 53%
×1story
+13ft-16ft

Overall

15134

Males

9473

M45-49

9473

25.2M→Finish

25.2 - 26.2 mi

Top 53%
×2stories
+22ft-21ft

Overall

15054

Males

9504

M45-49

9504

Passing Analysis

Category:
Athletes Passed
1158
Passed By
3683
Net Change
-2525
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12786
5K → 10K136562-426#12786#13212
10K → 15K109458-349#13212#13561
15K → 20K114449-335#13561#13896
20K → Half9125-116#13896#14012
Half → 25K86456-370#14012#14382
25K → 30K93821-728#14382#15110
30K → 20M76239-163#15110#15273
20M → 21M76206-130#15273#15403
21M → 35K6668-2#15403#15405
35K → 23M102132-30#15405#15435
23M → 24M8052+28#15435#15407
24M → 40K11040+70#15407#15337
40K → 25.2M3125+6#15337#15331
25.2M → Finish7050+20#15331#15311
TOTALS11583683-2525
📊

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