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BOSTON MARATHON 2025

Eunsuk Chang

Bib: 20641•F

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

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
25:32
Rank: #18247
Start → 5K
25:32 | 8:13/mi
10K· 6.21 mi
52:01
Rank: #19072 (-825)
5K → 10K
26:29 | 8:31/mi
15K· 9.32 mi
1:18:45
Rank: #19352 (-280)
10K → 15K
26:44 | 8:36/mi
20K· 12.43 mi
1:46:11
Rank: #19560 (-208)
15K → 20K
27:26 | 8:50/mi
Half· 13.11 mi
1:52:05
Rank: #19584 (-24)
20K → Half
5:54 | 8:39/mi
25K· 15.53 mi
2:14:02
Rank: #19670 (-86)
Half → 25K
21:57 | 9:03/mi
30K· 18.64 mi
2:42:47
Rank: #19508 (+162)
25K → 30K
28:45 | 9:15/mi
20M
2:55:26
Rank: #19417 (+91)
30K → 20M
12:39 | 9:19/mi
21M
3:05:20
Rank: #19314 (+103)
20M → 21M
9:54 | 9:54/mi
35K· 21.75 mi
3:11:51
Rank: #19225 (+89)
21M → 35K
6:31 | 8:43/mi
23M
3:23:32
Rank: #19145 (+80)
35K → 23M
11:41 | 9:20/mi
24M
3:32:30
Rank: #19061 (+84)
23M → 24M
8:58 | 8:58/mi
40K· 24.85 mi
3:40:21
Rank: #18967 (+94)
24M → 40K
7:51 | 9:11/mi
25.2M
3:43:48
Rank: #18940 (+27)
40K → 25.2M
3:27 | 10:00/mi
Finish· 26.22 mi
3:52:54
Rank: #18931 (+9)
25.2M → Finish
9:06 | 8:56/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:52:05
Pace8:33 /mi
2nd Half
Distance13.11 mi
Time2:00:49
Pace9:13 /mi
📊Positive Split: 7.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:18:2425:328:1325:32
8:13
-
10K
6.21 mi11:44:5352:018:2226:29
8:31
+0:18
15K
9.32 mi12:11:371:18:458:2726:44
8:36
+0:05
20K
12.43 mi12:39:031:46:118:3327:26
8:50
+0:14
Half
13.11 mi12:44:571:52:058:335:54
8:39
-0:11
25K
15.53 mi13:06:542:14:028:3821:57
9:03
+0:24
30K
18.64 mi13:35:392:42:478:4428:45
9:15
+0:12
20M
20.00 mi13:48:182:55:268:4612:39
9:19
+0:04
21M
21.00 mi13:58:123:05:208:509:54
9:54
+0:35
35K
21.75 mi14:04:433:11:518:496:31
8:43
-1:11
23M
23.00 mi14:16:243:23:328:5111:41
9:20
+0:37
24M
24.00 mi14:25:223:32:308:518:58
8:58
-0:22
40K
24.85 mi14:33:133:40:218:527:51
9:11
+0:13
25.2M
25.20 mi14:36:403:43:488:533:27
10:00
+0:49
Finish
26.22 mi14:45:463:52:548:539:06
8:56
-1:04

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

8:13 /mi

Average Pace

8:53 /mi

Slowest Pace

10:00 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:31:10

39% of race

Time at Steady Pace

1:15:18

32% of race

Time at Slower Pace

1:06:26

29% of race

Average Pace: 8:53 /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 mi11:18:2425:328:1325:32
8:13
#18247
10K
6.21 mi11:44:5352:018:2226:29
8:31
#19072
15K
9.32 mi12:11:371:18:458:2726:44
8:36
#19352
20K
12.43 mi12:39:031:46:118:3327:26
8:50
#19560
Half
13.11 mi12:44:571:52:058:335:54
8:39
#19584
25K
15.53 mi13:06:542:14:028:3821:57
9:03
#19670
30K
18.64 mi13:35:392:42:478:4428:45
9:15
#19508
20M
20.00 mi13:48:182:55:268:4612:39
9:19
#19417
21M
21.00 mi13:58:123:05:208:509:54
9:54
#19314
35K
21.75 mi14:04:433:11:518:496:31
8:43
#19225
23M
23.00 mi14:16:243:23:328:5111:41
9:20
#19145
24M
24.00 mi14:25:223:32:308:518:58
8:58
#19061
40K
24.85 mi14:33:133:40:218:527:51
9:11
#18967
25.2M
25.20 mi14:36:403:43:488:533:27
10:00
#18940
Finish
26.22 mi14:45:463:52:548:539:06
8:56
#18931
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi182476491649119957(Top 70%)7416(Top 61%)7416(Top 432%)
10K6.21 mi3.10 mi19072-8256945-4546945-45419938(Top 70%)7431(Top 61%)7431(Top 433%)
15K9.32 mi3.11 mi19352-2807094-1497094-14919957(Top 70%)7416(Top 61%)7416(Top 432%)
20K12.43 mi3.11 mi19560-2087221-1277221-12720106(Top 71%)7537(Top 62%)7537(Top 439%)
Half13.11 mi0.68 mi19584-247239-187239-1820075(Top 71%)7515(Top 61%)7515(Top 437%)
25K15.53 mi2.42 mi19670-867301-627301-6220148(Top 71%)7615(Top 62%)7615(Top 443%)
30K18.64 mi3.11 mi19508+1627242+597242+5918918(Top 67%)7076(Top 58%)7076(Top 412%)
20M20.00 mi1.36 mi19417+917214+287214+2818348(Top 65%)6921(Top 57%)6921(Top 403%)
21M21.00 mi1.00 mi19314+1037185+297185+2917921(Top 63%)6751(Top 55%)6751(Top 393%)
35K21.75 mi0.75 mi19225+897148+377148+3716814(Top 59%)6238(Top 51%)6238(Top 363%)
23M23.00 mi1.25 mi19145+807126+227126+2217947(Top 63%)6962(Top 57%)6962(Top 405%)
24M24.00 mi1.00 mi19061+847101+257101+2517217(Top 61%)6606(Top 54%)6606(Top 385%)
40K24.85 mi0.85 mi18967+947079+227079+2217288(Top 61%)6746(Top 55%)6746(Top 393%)
25.2M25.20 mi0.35 mi18940+277076+37076+317127(Top 60%)6665(Top 55%)6665(Top 388%)
Finish26.22 mi1.02 mi18931+97087-117087-1118689(Top 66%)7424(Top 61%)7424(Top 432%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 70%
×21stories
+97ft-345ft

Overall

19957

Females

7416

F40-44

7416

5K→10K

3.1 - 6.2 mi

Top 70%
×5stories
+79ft-138ft

Overall

19938

Females

7431

F40-44

7431

10K→15K

6.2 - 9.3 mi

Top 70%
×3stories
+67ft-78ft

Overall

19957

Females

7416

F40-44

7416

15K→20K

9.3 - 12.4 mi

Top 71%
×5stories
+106ft-86ft

Overall

20106

Females

7537

F40-44

7537

20K→Half

12.4 - 13.1 mi

Top 71%
×2stories
+19ft-37ft

Overall

20075

Females

7515

F40-44

7515

Half→25K

13.1 - 15.5 mi

Top 71%
×4stories
+66ft-88ft

Overall

20148

Females

7615

F40-44

7615

25K→30K

15.5 - 18.6 mi

Top 67%
×9stories
+181ft-148ft

Overall

18918

Females

7076

F40-44

7076

30K→20M

18.6 - 20.0 mi

Top 65%
×5stories
+64ft-50ft

Overall

18348

Females

6921

F40-44

6921

20M→21M

20.0 - 21.0 mi

Top 63%
×8stories
+106ft-24ft

Overall

17921

Females

6751

F40-44

6751

21M→35K

21.0 - 21.8 mi

Top 59%
×7stories
+17ft-86ft

Overall

16814

Females

6238

F40-44

6238

35K→23M

21.8 - 23.0 mi

Top 63%
×5stories
+23ft-63ft

Overall

17947

Females

6962

F40-44

6962

23M→24M

23.0 - 24.0 mi

Top 61%
×6stories
+12ft-82ft

Overall

17217

Females

6606

F40-44

6606

24M→40K

24.0 - 24.9 mi

Top 61%
×1story
+6ft-20ft

Overall

17288

Females

6746

F40-44

6746

40K→25.2M

24.9 - 25.2 mi

Top 60%
×1story
+13ft-16ft

Overall

17127

Females

6665

F40-44

6665

25.2M→Finish

25.2 - 26.2 mi

Top 66%
×2stories
+22ft-21ft

Overall

18689

Females

7424

F40-44

7424

Passing Analysis

Category:
Athletes Passed
1601
Passed By
2285
Net Change
-684
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18247
5K → 10K66891-825#18247#19072
10K → 15K106386-280#19072#19352
15K → 20K137345-208#19352#19560
20K → Half2650-24#19560#19584
Half → 25K126212-86#19584#19670
25K → 30K291129+162#19670#19508
30K → 20M14756+91#19508#19417
20M → 21M14845+103#19417#19314
21M → 35K10112+89#19314#19225
35K → 23M12444+80#19225#19145
23M → 24M11026+84#19145#19061
24M → 40K11723+94#19061#18967
40K → 25.2M4114+27#18967#18940
25.2M → Finish6152+9#18940#18931
TOTALS16012285-684
📊

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