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BOSTON MARATHON 2025

Chenlong Zhang

Bib: 28952•M

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 44%
Gender (Male)
#0 / 16105
Division (M18-39)
#0 / 5642
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:25
Rank: #12560
Start → 5K
23:25 | 7:32/mi
10K· 6.21 mi
47:00
Rank: #12685 (-125)
5K → 10K
23:35 | 7:35/mi
15K· 9.32 mi
1:10:43
Rank: #12741 (-56)
10K → 15K
23:43 | 7:38/mi
20K· 12.43 mi
1:34:40
Rank: #12639 (+102)
15K → 20K
23:57 | 7:43/mi
Half· 13.11 mi
1:39:52
Rank: #12646 (-7)
20K → Half
5:12 | 7:37/mi
25K· 15.53 mi
1:58:48
Rank: #12570 (+76)
Half → 25K
18:56 | 7:49/mi
30K· 18.64 mi
2:24:35
Rank: #12699 (-129)
25K → 30K
25:47 | 8:18/mi
20M
2:36:01
Rank: #12731 (-32)
30K → 20M
11:26 | 8:25/mi
21M
2:44:53
Rank: #12713 (+18)
20M → 21M
8:52 | 8:52/mi
35K· 21.75 mi
2:50:38
Rank: #12583 (+130)
21M → 35K
5:45 | 7:41/mi
23M
3:00:55
Rank: #12489 (+94)
35K → 23M
10:17 | 8:13/mi
24M
3:09:04
Rank: #12455 (+34)
23M → 24M
8:09 | 8:09/mi
40K· 24.85 mi
3:16:20
Rank: #12467 (-12)
24M → 40K
7:16 | 8:30/mi
25.2M
3:19:36
Rank: #12512 (-45)
40K → 25.2M
3:16 | 9:28/mi
Finish· 26.22 mi
3:27:59
Rank: #12580 (-68)
25.2M → Finish
8:23 | 8:14/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:39:52
Pace7:37 /mi
2nd Half
Distance13.11 mi
Time1:48:07
Pace8:15 /mi
📊Positive Split: 8.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:42:5823:257:3223:25
7:32
-
10K
6.21 mi12:06:3347:007:3423:35
7:35
+0:03
15K
9.32 mi12:30:161:10:437:3523:43
7:38
+0:03
20K
12.43 mi12:54:131:34:407:3723:57
7:43
+0:05
Half
13.11 mi12:59:251:39:527:375:12
7:37
-0:06
25K
15.53 mi13:18:211:58:487:3918:56
7:49
+0:12
30K
18.64 mi13:44:082:24:357:4525:47
8:18
+0:29
20M
20.00 mi13:55:342:36:017:4811:26
8:25
+0:07
21M
21.00 mi14:04:262:44:537:518:52
8:52
+0:27
35K
21.75 mi14:10:112:50:387:515:45
7:41
-1:11
23M
23.00 mi14:20:283:00:557:5210:17
8:13
+0:32
24M
24.00 mi14:28:373:09:047:538:09
8:09
-0:04
40K
24.85 mi14:35:533:16:207:547:16
8:30
+0:21
25.2M
25.20 mi14:39:093:19:367:553:16
9:28
+0:58
Finish
26.22 mi14:47:323:27:597:568:23
8:14
-1:14

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

7:32 /mi

Average Pace

7:56 /mi

Slowest Pace

9:28 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:04:33

60% of race

Time at Steady Pace

52:36

25% of race

Time at Slower Pace

30:50

15% of race

Average Pace: 7:56 /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 mi11:42:5823:257:3223:25
7:32
#12560
10K
6.21 mi12:06:3347:007:3423:35
7:35
#12685
15K
9.32 mi12:30:161:10:437:3523:43
7:38
#12741
20K
12.43 mi12:54:131:34:407:3723:57
7:43
#12639
Half
13.11 mi12:59:251:39:527:375:12
7:37
#12646
25K
15.53 mi13:18:211:58:487:3918:56
7:49
#12570
30K
18.64 mi13:44:082:24:357:4525:47
8:18
#12699
20M
20.00 mi13:55:342:36:017:4811:26
8:25
#12731
21M
21.00 mi14:04:262:44:537:518:52
8:52
#12713
35K
21.75 mi14:10:112:50:387:515:45
7:41
#12583
23M
23.00 mi14:20:283:00:557:5210:17
8:13
#12489
24M
24.00 mi14:28:373:09:047:538:09
8:09
#12455
40K
24.85 mi14:35:533:16:207:547:16
8:30
#12467
25.2M
25.20 mi14:39:093:19:367:553:16
9:28
#12512
Finish
26.22 mi14:47:323:27:597:568:23
8:14
#12580
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi125609429942912904(Top 45%)9470(Top 59%)9470(Top 168%)
10K6.21 mi3.10 mi12685-1259479-509479-5012916(Top 45%)9554(Top 59%)9554(Top 169%)
15K9.32 mi3.11 mi12741-569474+59474+512904(Top 45%)9470(Top 59%)9470(Top 168%)
20K12.43 mi3.11 mi12639+1029374+1009374+10012479(Top 44%)9185(Top 57%)9185(Top 163%)
Half13.11 mi0.68 mi12646-79368+69368+612707(Top 45%)9330(Top 58%)9330(Top 165%)
25K15.53 mi2.42 mi12570+769305+639305+6312419(Top 44%)9036(Top 56%)9036(Top 160%)
30K18.64 mi3.11 mi12699-1299293+129293+1213486(Top 47%)9349(Top 58%)9349(Top 166%)
20M20.00 mi1.36 mi12731-329266+279266+2713217(Top 47%)9083(Top 56%)9083(Top 161%)
21M21.00 mi1.00 mi12713+189227+399227+3912692(Top 45%)8688(Top 54%)8688(Top 154%)
35K21.75 mi0.75 mi12583+1309144+839144+839970(Top 35%)7370(Top 46%)7370(Top 131%)
23M23.00 mi1.25 mi12489+949060+849060+8411432(Top 40%)7962(Top 49%)7962(Top 141%)
24M24.00 mi1.00 mi12455+349024+369024+3612223(Top 43%)8279(Top 51%)8279(Top 147%)
40K24.85 mi0.85 mi12467-128995+298995+2913394(Top 47%)8705(Top 54%)8705(Top 154%)
25.2M25.20 mi0.35 mi12512-459001-69001-614376(Top 51%)9105(Top 57%)9105(Top 161%)
Finish26.22 mi1.02 mi12580-689009-89009-814422(Top 51%)9216(Top 57%)9216(Top 163%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 45%
×21stories
+97ft-345ft

Overall

12904

Males

9470

M18-39

9470

5K→10K

3.1 - 6.2 mi

Top 45%
×5stories
+79ft-138ft

Overall

12916

Males

9554

M18-39

9554

10K→15K

6.2 - 9.3 mi

Top 45%
×3stories
+67ft-78ft

Overall

12904

Males

9470

M18-39

9470

15K→20K

9.3 - 12.4 mi

Top 44%
×5stories
+106ft-86ft

Overall

12479

Males

9185

M18-39

9185

20K→Half

12.4 - 13.1 mi

Top 45%
×2stories
+19ft-37ft

Overall

12707

Males

9330

M18-39

9330

Half→25K

13.1 - 15.5 mi

Top 44%
×4stories
+66ft-88ft

Overall

12419

Males

9036

M18-39

9036

25K→30K

15.5 - 18.6 mi

Top 47%
×9stories
+181ft-148ft

Overall

13486

Males

9349

M18-39

9349

30K→20M

18.6 - 20.0 mi

Top 47%
×5stories
+64ft-50ft

Overall

13217

Males

9083

M18-39

9083

20M→21M

20.0 - 21.0 mi

Top 45%
×8stories
+106ft-24ft

Overall

12692

Males

8688

M18-39

8688

21M→35K

21.0 - 21.8 mi

Top 35%
×7stories
+17ft-86ft

Overall

9970

Males

7370

M18-39

7370

35K→23M

21.8 - 23.0 mi

Top 40%
×5stories
+23ft-63ft

Overall

11432

Males

7962

M18-39

7962

23M→24M

23.0 - 24.0 mi

Top 43%
×6stories
+12ft-82ft

Overall

12223

Males

8279

M18-39

8279

24M→40K

24.0 - 24.9 mi

Top 47%
×1story
+6ft-20ft

Overall

13394

Males

8705

M18-39

8705

40K→25.2M

24.9 - 25.2 mi

Top 51%
×1story
+13ft-16ft

Overall

14376

Males

9105

M18-39

9105

25.2M→Finish

25.2 - 26.2 mi

Top 51%
×2stories
+22ft-21ft

Overall

14422

Males

9216

M18-39

9216

Passing Analysis

Category:
Athletes Passed
1822
Passed By
1842
Net Change
-20
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12560
5K → 10K237362-125#12560#12685
10K → 15K165221-56#12685#12741
15K → 20K242140+102#12741#12639
20K → Half3138-7#12639#12646
Half → 25K184108+76#12646#12570
25K → 30K199328-129#12570#12699
30K → 20M106138-32#12699#12731
20M → 21M121103+18#12731#12713
21M → 35K1366+130#12713#12583
35K → 23M15965+94#12583#12489
23M → 24M9662+34#12489#12455
24M → 40K6880-12#12455#12467
40K → 25.2M2267-45#12467#12512
25.2M → Finish56124-68#12512#12580
TOTALS18221842-20
📊

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