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BOSTON MARATHON 2025

Sangheon Ko

Bib: 30371•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M65-69)
#0 / 639
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
9:25/mi
29:15
↑ 97↓ 3451.5%
10K· 6.21 mi
8:56/mi
56:59
↑ 79↓ 1380.4%
15K· 9.32 mi
9:00/mi
1:24:58
↑ 67↓ 78
20K· 12.43 mi
9:22/mi
1:54:05
↑ 106↓ 860.1%
Half· 13.11 mi
8:48/mi
2:00:05
↑ 19↓ 370.5%
25K· 15.53 mi
9:34/mi
2:23:16
↑ 66↓ 880.2%
30K· 18.64 mi
10:39/mi
2:56:20
↑ 181↓ 1480.2%
20M
12:17/mi
3:13:02
↑ 64↓ 500.2%
21M
15:32/mi
3:28:34
↑ 106↓ 241.6%
35K· 21.75 mi
11:47/mi
3:37:23
↑ 17↓ 861.7%
23M
11:24/mi
3:51:39
↑ 23↓ 630.6%
24M
10:40/mi
4:02:19
↓ 821.3%
40K· 24.85 mi
10:26/mi
4:11:14
↓ 200.3%
25.2M
12:22/mi
4:15:30
↑ 13↓ 160.2%
Finish· 26.22 mi
10:26/mi
4:26:08
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:00:05
Pace9:10 /mi
2nd Half
Distance13.11 mi
Time2:26:03
Pace11:08 /mi
📊Positive Split: 21.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:49:2729:159:2529:15
9:25
-
10K
6.21 mi12:17:1156:599:1027:44
8:56
-0:29
15K
9.32 mi12:45:101:24:589:0727:59
9:00
+0:04
20K
12.43 mi13:14:171:54:059:1129:07
9:22
+0:22
Half
13.11 mi13:20:172:00:059:106:00
8:48
-0:34
25K
15.53 mi13:43:282:23:169:1323:11
9:34
+0:46
30K
18.64 mi14:16:322:56:209:2833:04
10:39
+1:05
20M
20.00 mi14:33:143:13:029:3916:42
12:17
+1:38
21M
21.00 mi14:48:463:28:349:5615:32
15:32
+3:15
35K
21.75 mi14:57:353:37:2310:008:49
11:47
-3:45
23M
23.00 mi15:11:513:51:3910:0414:16
11:24
-0:23
24M
24.00 mi15:22:314:02:1910:0610:40
10:40
-0:44
40K
24.85 mi15:31:264:11:1410:068:55
10:26
-0:14
25.2M
25.20 mi15:35:424:15:3010:084:16
12:22
+1:56
Finish
26.22 mi15:46:204:26:0810:0910:38
10:26
-1:56

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

8:48 /mi

Average Pace

10:09 /mi

Slowest Pace

15:32 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:23:16

54% of race

Time at Steady Pace

1:03:17

24% of race

Time at Slower Pace

59:35

22% of race

Average Pace: 10:09 /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 mi11:49:2729:159:2529:15
9:25
#23951
10K
6.21 mi12:17:1156:599:1027:44
8:56
#23100
15K
9.32 mi12:45:101:24:589:0727:59
9:00
#22772
20K
12.43 mi13:14:171:54:059:1129:07
9:22
#22698
Half
13.11 mi13:20:172:00:059:106:00
8:48
#22609
25K
15.53 mi13:43:282:23:169:1323:11
9:34
#22520
30K
18.64 mi14:16:322:56:209:2833:04
10:39
#22684
20M
20.00 mi14:33:143:13:029:3916:42
12:17
#22996
21M
21.00 mi14:48:463:28:349:5615:32
15:32
#23534
35K
21.75 mi14:57:353:37:2310:008:49
11:47
#23651
23M
23.00 mi15:11:513:51:3910:0414:16
11:24
#23667
24M
24.00 mi15:22:314:02:1910:0610:40
10:40
#23662
40K
24.85 mi15:31:264:11:1410:068:55
10:26
#23599
25.2M
25.20 mi15:35:424:15:3010:084:16
12:22
#23613
Finish
26.22 mi15:46:204:26:0810:0910:38
10:26
#23614
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM65-69Seg. OverallSeg. MalesSeg. M65-69
5K3.11 mi3.11 mi23951142141421422083(Top 78%)13420(Top 83%)13420(Top 2100%)
10K6.21 mi3.10 mi23100+85113833+38113833+38122066(Top 78%)13374(Top 83%)13374(Top 2093%)
15K9.32 mi3.11 mi22772+32813713+12013713+12022083(Top 78%)13420(Top 83%)13420(Top 2100%)
20K12.43 mi3.11 mi22698+7413686+2713686+2722483(Top 79%)13571(Top 84%)13571(Top 2124%)
Half13.11 mi0.68 mi22609+8913639+4713639+4720882(Top 74%)12858(Top 80%)12858(Top 2012%)
25K15.53 mi2.42 mi22520+8913589+5013589+5022069(Top 78%)13321(Top 83%)13321(Top 2085%)
30K18.64 mi3.11 mi22684-16413616-2713616-2723260(Top 82%)13730(Top 85%)13730(Top 2149%)
20M20.00 mi1.36 mi22996-31213726-11013726-11025650(Top 90%)14759(Top 92%)14759(Top 2310%)
21M21.00 mi1.00 mi23534-53813954-22813954-22827556(Top 97%)15646(Top 97%)15646(Top 2449%)
35K21.75 mi0.75 mi23651-11714001-4714001-4725546(Top 90%)14607(Top 91%)14607(Top 2286%)
23M23.00 mi1.25 mi23667-1613992+913992+924070(Top 85%)13875(Top 86%)13875(Top 2171%)
24M24.00 mi1.00 mi23662+513967+2513967+2523236(Top 82%)13427(Top 83%)13427(Top 2101%)
40K24.85 mi0.85 mi23599+6313922+4513922+4521721(Top 76%)12619(Top 78%)12619(Top 1975%)
25.2M25.20 mi0.35 mi23613-14139221392223936(Top 84%)13738(Top 85%)13738(Top 2150%)
Finish26.22 mi1.02 mi23614-113904+1813904+1824126(Top 85%)13831(Top 86%)13831(Top 2164%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 78%
×21story building
+97ft-345ft

Overall

22083

Males

13420

M65-69

13420

5K→10K

3.1 - 6.2 mi

Top 78%
×5story building
+79ft-138ft

Overall

22066

Males

13374

M65-69

13374

10K→15K

6.2 - 9.3 mi

Top 78%
×3story building
+67ft-78ft

Overall

22083

Males

13420

M65-69

13420

15K→20K

9.3 - 12.4 mi

Top 79%
×5story building
+106ft-86ft

Overall

22483

Males

13571

M65-69

13571

20K→Half

12.4 - 13.1 mi

Top 74%
×2story building
+19ft-37ft

Overall

20882

Males

12858

M65-69

12858

Half→25K

13.1 - 15.5 mi

Top 78%
×4story building
+66ft-88ft

Overall

22069

Males

13321

M65-69

13321

25K→30K

15.5 - 18.6 mi

Top 82%
×9story building
+181ft-148ft

Overall

23260

Males

13730

M65-69

13730

30K→20M

18.6 - 20.0 mi

Top 90%
×5story building
+64ft-50ft

Overall

25650

Males

14759

M65-69

14759

20M→21M

20.0 - 21.0 mi

Top 97%
×8story building
+106ft-24ft

Overall

27556

Males

15646

M65-69

15646

21M→35K

21.0 - 21.8 mi

Top 90%
×7story building
+17ft-86ft

Overall

25546

Males

14607

M65-69

14607

35K→23M

21.8 - 23.0 mi

Top 85%
×5story building
+23ft-63ft

Overall

24070

Males

13875

M65-69

13875

23M→24M

23.0 - 24.0 mi

Top 82%
×6story building
+12ft-82ft

Overall

23236

Males

13427

M65-69

13427

24M→40K

24.0 - 24.9 mi

Top 76%
×1story
+6ft-20ft

Overall

21721

Males

12619

M65-69

12619

40K→25.2M

24.9 - 25.2 mi

Top 84%
×1story
+13ft-16ft

Overall

23936

Males

13738

M65-69

13738

25.2M→Finish

25.2 - 26.2 mi

Top 85%
×2story building
+22ft-21ft

Overall

24126

Males

13831

M65-69

13831

Passing Analysis

Category:
Athletes Passed
2161
Passed By
1824
Net Change
+337
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23951
5K → 10K87928+851#23951#23100
10K → 15K36840+328#23100#22772
15K → 20K221147+74#22772#22698
20K → Half934+89#22698#22609
Half → 25K18091+89#22609#22520
25K → 30K124288-164#22520#22684
30K → 20M25337-312#22684#22996
20M → 21M8546-538#22996#23534
21M → 35K17134-117#23534#23651
35K → 23M5874-16#23651#23667
23M → 24M4742+5#23667#23662
24M → 40K7916+63#23662#23599
40K → 25.2M1226-14#23599#23613
25.2M → Finish5051-1#23613#23614
TOTALS21611824+337
📊

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