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BOSTON MARATHON 2025

Mi Sung Heo-Kim

Bib: 24172•F

CA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F55-59)
#0 / 994
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
9:08/mi
28:22
↑ 97↓ 3451.5%
10K· 6.21 mi
8:57/mi
56:09
↑ 79↓ 1380.4%
15K· 9.32 mi
9:07/mi
1:24:27
↑ 67↓ 78
20K· 12.43 mi
9:33/mi
1:54:08
↑ 106↓ 860.1%
Half· 13.11 mi
9:08/mi
2:00:22
↑ 19↓ 370.5%
25K· 15.53 mi
9:42/mi
2:23:54
↑ 66↓ 880.2%
30K· 18.64 mi
10:24/mi
2:56:14
↑ 181↓ 1480.2%
20M
10:19/mi
3:10:15
↑ 64↓ 500.2%
21M
11:07/mi
3:21:22
↑ 106↓ 241.6%
35K· 21.75 mi
9:29/mi
3:28:28
↑ 17↓ 861.7%
23M
10:05/mi
3:41:06
↑ 23↓ 630.6%
24M
9:42/mi
3:50:48
↓ 821.3%
40K· 24.85 mi
10:05/mi
3:59:25
↓ 200.3%
25.2M
10:50/mi
4:03:09
↑ 13↓ 160.2%
Finish· 26.22 mi
9:29/mi
4:12:49
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:00:22
Pace9:11 /mi
2nd Half
Distance13.11 mi
Time2:12:27
Pace10:06 /mi
📊Positive Split: 10.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:28:0528:229:0828:22
9:08
-
10K
6.21 mi11:55:5256:099:0227:47
8:57
-0:11
15K
9.32 mi12:24:101:24:279:0428:18
9:07
+0:10
20K
12.43 mi12:53:511:54:089:1129:41
9:33
+0:26
Half
13.11 mi13:00:052:00:229:116:14
9:08
-0:25
25K
15.53 mi13:23:372:23:549:1623:32
9:42
+0:34
30K
18.64 mi13:55:572:56:149:2732:20
10:24
+0:42
20M
20.00 mi14:09:583:10:159:3114:01
10:19
-0:05
21M
21.00 mi14:21:053:21:229:3511:07
11:07
+0:48
35K
21.75 mi14:28:113:28:289:357:06
9:29
-1:38
23M
23.00 mi14:40:493:41:069:3712:38
10:05
+0:36
24M
24.00 mi14:50:313:50:489:379:42
9:42
-0:23
40K
24.85 mi14:59:083:59:259:388:37
10:05
+0:23
25.2M
25.20 mi15:02:524:03:099:393:44
10:50
+0:45
Finish
26.22 mi15:12:324:12:499:399:40
9:29
-1:21

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

8:57 /mi

Average Pace

9:39 /mi

Slowest Pace

11:07 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:30:41

36% of race

Time at Steady Pace

1:19:41

32% of race

Time at Slower Pace

1:22:27

33% of race

Average Pace: 9:39 /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 mi11:28:0528:229:0828:22
9:08
#22963
10K
6.21 mi11:55:5256:099:0227:47
8:57
#22569
15K
9.32 mi12:24:101:24:279:0428:18
9:07
#22539
20K
12.43 mi12:53:511:54:089:1129:41
9:33
#22715
Half
13.11 mi13:00:052:00:229:116:14
9:08
#22693
25K
15.53 mi13:23:372:23:549:1623:32
9:42
#22665
30K
18.64 mi13:55:572:56:149:2732:20
10:24
#22666
20M
20.00 mi14:09:583:10:159:3114:01
10:19
#22602
21M
21.00 mi14:21:053:21:229:3511:07
11:07
#22530
35K
21.75 mi14:28:113:28:289:357:06
9:29
#22441
23M
23.00 mi14:40:493:41:069:3712:38
10:05
#22325
24M
24.00 mi14:50:313:50:489:379:42
9:42
#22238
40K
24.85 mi14:59:083:59:259:388:37
10:05
#22185
25.2M
25.20 mi15:02:524:03:099:393:44
10:50
#22153
Finish
26.22 mi15:12:324:12:499:399:40
9:29
#22099
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF55-59Seg. OverallSeg. FemalesSeg. F55-59
5K3.11 mi3.11 mi229639147914722502(Top 79%)8835(Top 72%)8835(Top 889%)
10K6.21 mi3.10 mi22569+3948922+2258922+22522132(Top 78%)8674(Top 71%)8674(Top 873%)
15K9.32 mi3.11 mi22539+308878+448878+4422502(Top 79%)8835(Top 72%)8835(Top 889%)
20K12.43 mi3.11 mi22715-1768960-828960-8223073(Top 81%)9188(Top 75%)9188(Top 924%)
Half13.11 mi0.68 mi22693+228951+98951+922405(Top 79%)8835(Top 72%)8835(Top 889%)
25K15.53 mi2.42 mi22665+288957-68957-622521(Top 79%)8944(Top 73%)8944(Top 900%)
30K18.64 mi3.11 mi22666-19002-459002-4522731(Top 80%)9172(Top 75%)9172(Top 923%)
20M20.00 mi1.36 mi22602+648990+128990+1221915(Top 77%)8841(Top 72%)8841(Top 889%)
21M21.00 mi1.00 mi22530+728964+268964+2621705(Top 76%)8814(Top 72%)8814(Top 887%)
35K21.75 mi0.75 mi22441+898927+378927+3720335(Top 72%)8159(Top 67%)8159(Top 821%)
23M23.00 mi1.25 mi22325+1168897+308897+3020793(Top 73%)8450(Top 69%)8450(Top 850%)
24M24.00 mi1.00 mi22238+878878+198878+1920405(Top 72%)8297(Top 68%)8297(Top 835%)
40K24.85 mi0.85 mi22185+538859+198859+1920733(Top 73%)8529(Top 70%)8529(Top 858%)
25.2M25.20 mi0.35 mi22153+328849+108849+1020167(Top 71%)8257(Top 68%)8257(Top 831%)
Finish26.22 mi1.02 mi22099+548836+138836+1321147(Top 74%)8733(Top 71%)8733(Top 879%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 79%
×21story building
+97ft-345ft

Overall

22502

Females

8835

F55-59

8835

5K→10K

3.1 - 6.2 mi

Top 78%
×5story building
+79ft-138ft

Overall

22132

Females

8674

F55-59

8674

10K→15K

6.2 - 9.3 mi

Top 79%
×3story building
+67ft-78ft

Overall

22502

Females

8835

F55-59

8835

15K→20K

9.3 - 12.4 mi

Top 81%
×5story building
+106ft-86ft

Overall

23073

Females

9188

F55-59

9188

20K→Half

12.4 - 13.1 mi

Top 79%
×2story building
+19ft-37ft

Overall

22405

Females

8835

F55-59

8835

Half→25K

13.1 - 15.5 mi

Top 79%
×4story building
+66ft-88ft

Overall

22521

Females

8944

F55-59

8944

25K→30K

15.5 - 18.6 mi

Top 80%
×9story building
+181ft-148ft

Overall

22731

Females

9172

F55-59

9172

30K→20M

18.6 - 20.0 mi

Top 77%
×5story building
+64ft-50ft

Overall

21915

Females

8841

F55-59

8841

20M→21M

20.0 - 21.0 mi

Top 76%
×8story building
+106ft-24ft

Overall

21705

Females

8814

F55-59

8814

21M→35K

21.0 - 21.8 mi

Top 72%
×7story building
+17ft-86ft

Overall

20335

Females

8159

F55-59

8159

35K→23M

21.8 - 23.0 mi

Top 73%
×5story building
+23ft-63ft

Overall

20793

Females

8450

F55-59

8450

23M→24M

23.0 - 24.0 mi

Top 72%
×6story building
+12ft-82ft

Overall

20405

Females

8297

F55-59

8297

24M→40K

24.0 - 24.9 mi

Top 73%
×1story
+6ft-20ft

Overall

20733

Females

8529

F55-59

8529

40K→25.2M

24.9 - 25.2 mi

Top 71%
×1story
+13ft-16ft

Overall

20167

Females

8257

F55-59

8257

25.2M→Finish

25.2 - 26.2 mi

Top 74%
×2story building
+22ft-21ft

Overall

21147

Females

8733

F55-59

8733

Passing Analysis

Category:
Athletes Passed
1908
Passed By
1044
Net Change
+864
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22963
5K → 10K48187+394#22963#22569
10K → 15K195165+30#22569#22539
15K → 20K123299-176#22539#22715
20K → Half4321+22#22715#22693
Half → 25K160132+28#22693#22665
25K → 30K169170-1#22665#22666
30K → 20M10339+64#22666#22602
20M → 21M11139+72#22602#22530
21M → 35K945+89#22530#22441
35K → 23M13620+116#22441#22325
23M → 24M10114+87#22325#22238
24M → 40K7219+53#22238#22185
40K → 25.2M419+32#22185#22153
25.2M → Finish7925+54#22153#22099
TOTALS19081044+864
📊

Passing Visuals

Category:
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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