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BOSTON MARATHON 2025

Changhoon Lee

Bib: 3184•M

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 16%
Gender (Male)
#0 / 16105
Top 26%
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
20:26
Rank: #4407
Start → 5K
20:26 | 6:35/mi
10K· 6.21 mi
40:54
Rank: #4359 (+48)
5K → 10K
20:28 | 6:35/mi
15K· 9.32 mi
1:01:16
Rank: #4202 (+157)
10K → 15K
20:22 | 6:33/mi
20K· 12.43 mi
1:21:44
Rank: #3997 (+205)
15K → 20K
20:28 | 6:35/mi
Half· 13.11 mi
1:26:08
Rank: #3950 (+47)
20K → Half
4:24 | 6:27/mi
25K· 15.53 mi
1:42:01
Rank: #3801 (+149)
Half → 25K
15:53 | 6:33/mi
30K· 18.64 mi
2:03:16
Rank: #3724 (+77)
25K → 30K
21:15 | 6:50/mi
20M
2:14:44
Rank: #4400 (-676)
30K → 20M
11:28 | 8:26/mi
21M
2:22:16
Rank: #4408 (-8)
20M → 21M
7:32 | 7:32/mi
35K· 21.75 mi
2:27:28
Rank: #4408
21M → 35K
5:12 | 6:57/mi
23M
2:36:24
Rank: #4388 (+20)
35K → 23M
8:56 | 7:08/mi
24M
2:43:22
Rank: #4370 (+18)
23M → 24M
6:58 | 6:58/mi
40K· 24.85 mi
2:49:25
Rank: #4353 (+17)
24M → 40K
6:03 | 7:05/mi
25.2M
2:52:07
Rank: #4354 (-1)
40K → 25.2M
2:42 | 7:50/mi
Finish· 26.22 mi
2:59:28
Rank: #4518 (-164)
25.2M → Finish
7:21 | 7:13/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:26:08
Pace6:34 /mi
2nd Half
Distance13.11 mi
Time1:33:20
Pace7:07 /mi
📊Positive Split: 8.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:0120:266:3520:26
6:35
-
10K
6.21 mi10:42:2940:546:3520:28
6:35
0:00
15K
9.32 mi11:02:511:01:166:3420:22
6:33
-0:02
20K
12.43 mi11:23:191:21:446:3520:28
6:35
+0:02
Half
13.11 mi11:27:431:26:086:344:24
6:27
-0:08
25K
15.53 mi11:43:361:42:016:3415:53
6:33
+0:06
30K
18.64 mi12:04:512:03:166:3721:15
6:50
+0:17
20M
20.00 mi12:16:192:14:446:4411:28
8:26
+1:36
21M
21.00 mi12:23:512:22:166:467:32
7:32
-0:54
35K
21.75 mi12:29:032:27:286:475:12
6:57
-0:35
23M
23.00 mi12:37:592:36:246:488:56
7:08
+0:11
24M
24.00 mi12:44:572:43:226:486:58
6:58
-0:10
40K
24.85 mi12:51:002:49:256:496:03
7:05
+0:07
25.2M
25.20 mi12:53:422:52:076:502:42
7:50
+0:45
Finish
26.22 mi13:01:032:59:286:517:21
7:13
-0:37

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

6:27 /mi

Average Pace

6:51 /mi

Slowest Pace

8:26 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:42:01

57% of race

Time at Steady Pace

55:45

31% of race

Time at Slower Pace

21:42

12% of race

Average Pace: 6:51 /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 mi10:22:0120:266:3520:26
6:35
#4407
10K
6.21 mi10:42:2940:546:3520:28
6:35
#4359
15K
9.32 mi11:02:511:01:166:3420:22
6:33
#4202
20K
12.43 mi11:23:191:21:446:3520:28
6:35
#3997
Half
13.11 mi11:27:431:26:086:344:24
6:27
#3950
25K
15.53 mi11:43:361:42:016:3415:53
6:33
#3801
30K
18.64 mi12:04:512:03:166:3721:15
6:50
#3724
20M
20.00 mi12:16:192:14:446:4411:28
8:26
#4400
21M
21.00 mi12:23:512:22:166:467:32
7:32
#4408
35K
21.75 mi12:29:032:27:286:475:12
6:57
#4408
23M
23.00 mi12:37:592:36:246:488:56
7:08
#4388
24M
24.00 mi12:44:572:43:226:486:58
6:58
#4370
40K
24.85 mi12:51:002:49:256:496:03
7:05
#4353
25.2M
25.20 mi12:53:422:52:076:502:42
7:50
#4354
Finish
26.22 mi13:01:032:59:286:517:21
7:13
#4518
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi4407414441443926(Top 14%)3702(Top 23%)3702(Top 66%)
10K6.21 mi3.10 mi4359+484099+454099+454384(Top 15%)4117(Top 26%)4117(Top 73%)
15K9.32 mi3.11 mi4202+1573957+1423957+1423926(Top 14%)3702(Top 23%)3702(Top 66%)
20K12.43 mi3.11 mi3997+2053764+1933764+1933627(Top 13%)3426(Top 21%)3426(Top 61%)
Half13.11 mi0.68 mi3950+473720+443720+443423(Top 12%)3249(Top 20%)3249(Top 58%)
25K15.53 mi2.42 mi3801+1493583+1373583+1373178(Top 11%)3012(Top 19%)3012(Top 53%)
30K18.64 mi3.11 mi3724+773513+703513+703692(Top 13%)3417(Top 21%)3417(Top 61%)
20M20.00 mi1.36 mi4400-6764102-5894102-58913356(Top 47%)9142(Top 57%)9142(Top 162%)
21M21.00 mi1.00 mi4408-84094+84094+84787(Top 17%)4221(Top 26%)4221(Top 75%)
35K21.75 mi0.75 mi44084089+54089+55065(Top 18%)4432(Top 28%)4432(Top 79%)
23M23.00 mi1.25 mi4388+204062+274062+274522(Top 16%)3973(Top 25%)3973(Top 70%)
24M24.00 mi1.00 mi4370+184037+254037+254451(Top 16%)3872(Top 24%)3872(Top 69%)
40K24.85 mi0.85 mi4353+174013+244013+244349(Top 15%)3747(Top 23%)3747(Top 66%)
25.2M25.20 mi0.35 mi4354-14009+44009+45028(Top 18%)4145(Top 26%)4145(Top 73%)
Finish26.22 mi1.02 mi4518-1644144-1354144-1357098(Top 25%)5385(Top 33%)5385(Top 95%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 14%
×21stories
+97ft-345ft

Overall

3926

Males

3702

M18-39

3702

5K→10K

3.1 - 6.2 mi

Top 15%
×5stories
+79ft-138ft

Overall

4384

Males

4117

M18-39

4117

10K→15K

6.2 - 9.3 mi

Top 14%
×3stories
+67ft-78ft

Overall

3926

Males

3702

M18-39

3702

15K→20K

9.3 - 12.4 mi

Top 13%
×5stories
+106ft-86ft

Overall

3627

Males

3426

M18-39

3426

20K→Half

12.4 - 13.1 mi

Top 12%
×2stories
+19ft-37ft

Overall

3423

Males

3249

M18-39

3249

Half→25K

13.1 - 15.5 mi

Top 11%
×4stories
+66ft-88ft

Overall

3178

Males

3012

M18-39

3012

25K→30K

15.5 - 18.6 mi

Top 13%
×9stories
+181ft-148ft

Overall

3692

Males

3417

M18-39

3417

30K→20M

18.6 - 20.0 mi

Top 47%
×5stories
+64ft-50ft

Overall

13356

Males

9142

M18-39

9142

20M→21M

20.0 - 21.0 mi

Top 17%
×8stories
+106ft-24ft

Overall

4787

Males

4221

M18-39

4221

21M→35K

21.0 - 21.8 mi

Top 18%
×7stories
+17ft-86ft

Overall

5065

Males

4432

M18-39

4432

35K→23M

21.8 - 23.0 mi

Top 16%
×5stories
+23ft-63ft

Overall

4522

Males

3973

M18-39

3973

23M→24M

23.0 - 24.0 mi

Top 16%
×6stories
+12ft-82ft

Overall

4451

Males

3872

M18-39

3872

24M→40K

24.0 - 24.9 mi

Top 15%
×1story
+6ft-20ft

Overall

4349

Males

3747

M18-39

3747

40K→25.2M

24.9 - 25.2 mi

Top 18%
×1story
+13ft-16ft

Overall

5028

Males

4145

M18-39

4145

25.2M→Finish

25.2 - 26.2 mi

Top 25%
×2stories
+22ft-21ft

Overall

7098

Males

5385

M18-39

5385

Passing Analysis

Category:
Athletes Passed
1280
Passed By
1391
Net Change
-111
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4407
5K → 10K156108+48#4407#4359
10K → 15K19437+157#4359#4202
15K → 20K22722+205#4202#3997
20K → Half492+47#3997#3950
Half → 25K16112+149#3950#3801
25K → 30K14568+77#3801#3724
30K → 20M6682-676#3724#4400
20M → 21M6977-8#4400#4408
21M → 35K47470#4408#4408
35K → 23M7454+20#4408#4388
23M → 24M6244+18#4388#4370
24M → 40K5235+17#4370#4353
40K → 25.2M2324-1#4353#4354
25.2M → Finish15179-164#4354#4518
TOTALS12801391-111
📊

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