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BOSTON MARATHON 2025

Jongok Kim

Bib: 15457 F KR

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Top 44%
Division (F50-54)
#0 / 1303
Top 39%
Race Day Weather
50°/40°F
broken clouds

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
8:05/mi
25:07
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:51/mi
49:30
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
8:00/mi
1:14:20
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
8:29/mi
1:40:41
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
8:24/mi
1:46:25
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
8:31/mi
2:07:05
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
9:16/mi
2:35:53
↑ 181↓ 1480.2%
138 ft elev
20M
9:27/mi
2:48:43
↑ 64↓ 500.2%
148 ft elev
21M
10:10/mi
2:58:53
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
8:43/mi
3:05:24
↑ 17↓ 861.7%
156 ft elev
23M
9:25/mi
3:17:12
↑ 23↓ 630.6%
116 ft elev
24M
9:24/mi
3:26:36
↓ 821.3%
34 ft elev
40K· 24.85 mi
9:26/mi
3:34:40
↓ 200.3%
20 ft elev
25.2M
11:07/mi
3:38:30
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
9:40/mi
3:48:21
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:46:258:07 /mi⚡ faster
2nd Half
2:01:569:18 /mi+14.6%
Positive split — 14.6% slower in the second half
Is this your race?

Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:17:4325:078:0525:07
8:05
-
10K
6.21 mi11:42:0649:307:5824:23
7:51
-0:14
15K
9.32 mi12:06:561:14:207:5924:50
8:00
+0:09
20K
12.43 mi12:33:171:40:418:0626:21
8:29
+0:29
Half
13.11 mi12:39:011:46:258:075:44
8:24
-0:05
25K
15.53 mi12:59:412:07:058:1120:40
8:31
+0:07
30K
18.64 mi13:28:292:35:538:2228:48
9:16
+0:45
20M
20.00 mi13:41:192:48:438:2612:50
9:27
+0:11
21M
21.00 mi13:51:292:58:538:3110:10
10:10
+0:43
35K
21.75 mi13:58:003:05:248:316:31
8:43
-1:27
23M
23.00 mi14:09:483:17:128:3411:48
9:25
+0:42
24M
24.00 mi14:19:123:26:368:379:24
9:24
-0:01
40K
24.85 mi14:27:163:34:408:388:04
9:26
+0:02
25.2M
25.20 mi14:31:063:38:308:403:50
11:07
+1:41
Finish
26.22 mi14:40:573:48:218:439:51
9:40
-1:27

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

7:51 /mi

Average Pace

8:43 /mi

Slowest Pace

11:07 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Segment Time Comparison

Time at Faster Pace

2:13:36

59% of race

Time at Steady Pace

1:20:45

35% of race

Time at Slower Pace

14:00

6% of race

Average Pace: 8:43 /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 mi11:17:4325:078:0525:07
8:05
#17261
10K
6.21 mi11:42:0649:307:5824:23
7:51
#16237
15K
9.32 mi12:06:561:14:207:5924:50
8:00
#16129
20K
12.43 mi12:33:171:40:418:0626:21
8:29
#16696
Half
13.11 mi12:39:011:46:258:075:44
8:24
#16797
25K
15.53 mi12:59:412:07:058:1120:40
8:31
#16846
30K
18.64 mi13:28:292:35:538:2228:48
9:16
#17220
20M
20.00 mi13:41:192:48:438:2612:50
9:27
#17365
21M
21.00 mi13:51:292:58:538:3110:10
10:10
#17485
35K
21.75 mi13:58:003:05:248:316:31
8:43
#17443
23M
23.00 mi14:09:483:17:128:3411:48
9:25
#17504
24M
24.00 mi14:19:123:26:368:379:24
9:24
#17596
40K
24.85 mi14:27:163:34:408:388:04
9:26
#17624
25.2M
25.20 mi14:31:063:38:308:403:50
11:07
#17695
Finish
26.22 mi14:40:573:48:218:439:51
9:40
#17928
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF50-54Seg. OverallSeg. FemalesSeg. F50-54
5K3.11 mi3.11 mi17261589658961602151605160
10K6.21 mi3.10 mi16237+10245290+6065290+6061526347004700
15K9.32 mi3.11 mi16129+1085217+735217+731602151605160
20K12.43 mi3.11 mi16696-5675552-3355552-3351811864086408
Half13.11 mi0.68 mi16797-1015607-555607-551864967086708
25K15.53 mi2.42 mi16846-495673-665673-661735960616061
30K18.64 mi3.11 mi17220-3745945-2725945-2721897771047104
20M20.00 mi1.36 mi17365-1456062-1176062-1171891572147214
21M21.00 mi1.00 mi17485-1206160-986160-981892572967296
35K21.75 mi0.75 mi17443+426162-26162-21679262166216
23M23.00 mi1.25 mi17504-616226-646226-641835371607160
24M24.00 mi1.00 mi17596-926303-776303-771923976677667
40K24.85 mi0.85 mi17624-286346-436346-431844573537353
25.2M25.20 mi0.35 mi17695-716397-516397-512100486488648
Finish26.22 mi1.02 mi17928-2336528-1316528-1312180290569056

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 56%
×21story building
+97ft-345ft

Overall

16021

Females

5160

F50-54

5160

5K→10K

3.1 - 6.2 mi

Top 54%
×5story building
+79ft-138ft

Overall

15263

Females

4700

F50-54

4700

10K→15K

6.2 - 9.3 mi

Top 56%
×3story building
+67ft-78ft

Overall

16021

Females

5160

F50-54

5160

15K→20K

9.3 - 12.4 mi

Top 64%
×5story building
+106ft-86ft

Overall

18118

Females

6408

F50-54

6408

20K→Half

12.4 - 13.1 mi

Top 66%
×2story building
+19ft-37ft

Overall

18649

Females

6708

F50-54

6708

Half→25K

13.1 - 15.5 mi

Top 61%
×4story building
+66ft-88ft

Overall

17359

Females

6061

F50-54

6061

25K→30K

15.5 - 18.6 mi

Top 67%
×9story building
+181ft-148ft

Overall

18977

Females

7104

F50-54

7104

30K→20M

18.6 - 20.0 mi

Top 67%
×5story building
+64ft-50ft

Overall

18915

Females

7214

F50-54

7214

20M→21M

20.0 - 21.0 mi

Top 67%
×8story building
+106ft-24ft

Overall

18925

Females

7296

F50-54

7296

21M→35K

21.0 - 21.8 mi

Top 59%
×7story building
+17ft-86ft

Overall

16792

Females

6216

F50-54

6216

35K→23M

21.8 - 23.0 mi

Top 65%
×5story building
+23ft-63ft

Overall

18353

Females

7160

F50-54

7160

23M→24M

23.0 - 24.0 mi

Top 68%
×6story building
+12ft-82ft

Overall

19239

Females

7667

F50-54

7667

24M→40K

24.0 - 24.9 mi

Top 65%
×1story
+6ft-20ft

Overall

18445

Females

7353

F50-54

7353

40K→25.2M

24.9 - 25.2 mi

Top 74%
×1story
+13ft-16ft

Overall

21004

Females

8648

F50-54

8648

25.2M→Finish

25.2 - 26.2 mi

Top 77%
×2story building
+22ft-21ft

Overall

21802

Females

9056

F50-54

9056

Passing Analysis

Category:
Athletes Passed
2145
Passed By
2812
Net Change
-667
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17261
5K → 10K107248+1024#17261#16237
10K → 15K257149+108#16237#16129
15K → 20K76643-567#16129#16696
20K → Half15116-101#16696#16797
Half → 25K135184-49#16797#16846
25K → 30K129503-374#16846#17220
30K → 20M73218-145#17220#17365
20M → 21M67187-120#17365#17485
21M → 35K8644+42#17485#17443
35K → 23M99160-61#17443#17504
23M → 24M47139-92#17504#17596
24M → 40K5987-28#17596#17624
40K → 25.2M1283-71#17624#17695
25.2M → Finish18251-233#17695#17928
TOTALS21452812-667

Passing Charts

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