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BOSTON MARATHON 2025

Byungdoo Chun

Bib: 24793•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
10:03/mi
31:12
↑ 97↓ 3451.5%
10K· 6.21 mi
9:19/mi
1:00:10
↑ 79↓ 1380.4%
15K· 9.32 mi
9:08/mi
1:28:33
↑ 67↓ 78
20K· 12.43 mi
9:07/mi
1:56:54
↑ 106↓ 860.1%
Half· 13.11 mi
8:59/mi
2:03:02
↑ 19↓ 370.5%
25K· 15.53 mi
9:07/mi
2:25:08
↑ 66↓ 880.2%
30K· 18.64 mi
9:35/mi
2:54:55
↑ 181↓ 1480.2%
20M
9:27/mi
3:07:45
↑ 64↓ 500.2%
21M
10:02/mi
3:17:47
↑ 106↓ 241.6%
35K· 21.75 mi
9:15/mi
3:24:42
↑ 17↓ 861.7%
23M
9:33/mi
3:36:40
↑ 23↓ 630.6%
24M
9:24/mi
3:46:04
↓ 821.3%
40K· 24.85 mi
9:40/mi
3:54:20
↓ 200.3%
25.2M
10:18/mi
3:57:53
↑ 13↓ 160.2%
Finish· 26.22 mi
9:30/mi
4:07:34
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:03:02
Pace9:23 /mi
2nd Half
Distance13.11 mi
Time2:04:32
Pace9:30 /mi
📊Positive Split: 1.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:31:3031:1210:0331:12
10:03
-
10K
6.21 mi12:00:281:00:109:4128:58
9:19
-0:44
15K
9.32 mi12:28:511:28:339:3028:23
9:08
-0:11
20K
12.43 mi12:57:121:56:549:2428:21
9:07
-0:01
Half
13.11 mi13:03:202:03:029:236:08
8:59
-0:08
25K
15.53 mi13:25:262:25:089:2122:06
9:07
+0:08
30K
18.64 mi13:55:132:54:559:2329:47
9:35
+0:28
20M
20.00 mi14:08:033:07:459:2312:50
9:27
-0:08
21M
21.00 mi14:18:053:17:479:2510:02
10:02
+0:35
35K
21.75 mi14:25:003:24:429:256:55
9:15
-0:47
23M
23.00 mi14:36:583:36:409:2511:58
9:33
+0:18
24M
24.00 mi14:46:223:46:049:259:24
9:24
-0:09
40K
24.85 mi14:54:383:54:209:268:16
9:40
+0:16
25.2M
25.20 mi14:58:113:57:539:263:33
10:18
+0:38
Finish
26.22 mi15:07:524:07:349:279:41
9:30
-0:48

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

8:59 /mi

Average Pace

9:27 /mi

Slowest Pace

10:18 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:22:47

82% of race

Time at Steady Pace

44:47

18% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 9:27 /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 mi11:31:3031:1210:0331:12
10:03
#25680
10K
6.21 mi12:00:281:00:109:4128:58
9:19
#24695
15K
9.32 mi12:28:511:28:339:3028:23
9:08
#24028
20K
12.43 mi12:57:121:56:549:2428:21
9:07
#23489
Half
13.11 mi13:03:202:03:029:236:08
8:59
#23388
25K
15.53 mi13:25:262:25:089:2122:06
9:07
#22926
30K
18.64 mi13:55:132:54:559:2329:47
9:35
#22436
20M
20.00 mi14:08:033:07:459:2312:50
9:27
#22208
21M
21.00 mi14:18:053:17:479:2510:02
10:02
#21970
35K
21.75 mi14:25:003:24:429:256:55
9:15
#21873
23M
23.00 mi14:36:583:36:409:2511:58
9:33
#21686
24M
24.00 mi14:46:223:46:049:259:24
9:24
#21583
40K
24.85 mi14:54:383:54:209:268:16
9:40
#21488
25.2M
25.20 mi14:58:113:57:539:263:33
10:18
#21427
Finish
26.22 mi15:07:524:07:349:279:41
9:30
#21410
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM65-69Seg. OverallSeg. MalesSeg. M65-69
5K3.11 mi3.11 mi25680150411504122606(Top 80%)13649(Top 85%)13649(Top 2136%)
10K6.21 mi3.10 mi24695+98514571+47014571+47023597(Top 83%)14071(Top 87%)14071(Top 2202%)
15K9.32 mi3.11 mi24028+66714270+30114270+30122606(Top 80%)13649(Top 85%)13649(Top 2136%)
20K12.43 mi3.11 mi23489+53914029+24114029+24121564(Top 76%)13160(Top 82%)13160(Top 2059%)
Half13.11 mi0.68 mi23388+10113989+4013989+4021756(Top 77%)13244(Top 82%)13244(Top 2073%)
25K15.53 mi2.42 mi22926+46213762+22713762+22720416(Top 72%)12598(Top 78%)12598(Top 1972%)
30K18.64 mi3.11 mi22436+49013501+26113501+26120297(Top 71%)12426(Top 77%)12426(Top 1945%)
20M20.00 mi1.36 mi22208+22813391+11013391+11018907(Top 67%)11649(Top 72%)11649(Top 1823%)
21M21.00 mi1.00 mi21970+23813263+12813263+12818429(Top 65%)11361(Top 71%)11361(Top 1778%)
35K21.75 mi0.75 mi21873+9713211+5213211+5219345(Top 68%)11671(Top 72%)11671(Top 1826%)
23M23.00 mi1.25 mi21686+18713090+12113090+12118926(Top 67%)11411(Top 71%)11411(Top 1786%)
24M24.00 mi1.00 mi21583+10313027+6313027+6319227(Top 68%)11520(Top 72%)11520(Top 1803%)
40K24.85 mi0.85 mi21488+9512966+6112966+6119349(Top 68%)11496(Top 71%)11496(Top 1799%)
25.2M25.20 mi0.35 mi21427+6112927+3912927+3918266(Top 64%)10959(Top 68%)10959(Top 1715%)
Finish26.22 mi1.02 mi21410+1712904+2312904+2321188(Top 75%)12385(Top 77%)12385(Top 1938%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 80%
×21story building
+97ft-345ft

Overall

22606

Males

13649

M65-69

13649

5K→10K

3.1 - 6.2 mi

Top 83%
×5story building
+79ft-138ft

Overall

23597

Males

14071

M65-69

14071

10K→15K

6.2 - 9.3 mi

Top 80%
×3story building
+67ft-78ft

Overall

22606

Males

13649

M65-69

13649

15K→20K

9.3 - 12.4 mi

Top 76%
×5story building
+106ft-86ft

Overall

21564

Males

13160

M65-69

13160

20K→Half

12.4 - 13.1 mi

Top 77%
×2story building
+19ft-37ft

Overall

21756

Males

13244

M65-69

13244

Half→25K

13.1 - 15.5 mi

Top 72%
×4story building
+66ft-88ft

Overall

20416

Males

12598

M65-69

12598

25K→30K

15.5 - 18.6 mi

Top 71%
×9story building
+181ft-148ft

Overall

20297

Males

12426

M65-69

12426

30K→20M

18.6 - 20.0 mi

Top 67%
×5story building
+64ft-50ft

Overall

18907

Males

11649

M65-69

11649

20M→21M

20.0 - 21.0 mi

Top 65%
×8story building
+106ft-24ft

Overall

18429

Males

11361

M65-69

11361

21M→35K

21.0 - 21.8 mi

Top 68%
×7story building
+17ft-86ft

Overall

19345

Males

11671

M65-69

11671

35K→23M

21.8 - 23.0 mi

Top 67%
×5story building
+23ft-63ft

Overall

18926

Males

11411

M65-69

11411

23M→24M

23.0 - 24.0 mi

Top 68%
×6story building
+12ft-82ft

Overall

19227

Males

11520

M65-69

11520

24M→40K

24.0 - 24.9 mi

Top 68%
×1story
+6ft-20ft

Overall

19349

Males

11496

M65-69

11496

40K→25.2M

24.9 - 25.2 mi

Top 64%
×1story
+13ft-16ft

Overall

18266

Males

10959

M65-69

10959

25.2M→Finish

25.2 - 26.2 mi

Top 75%
×2story building
+22ft-21ft

Overall

21188

Males

12385

M65-69

12385

Passing Analysis

Category:
Athletes Passed
4379
Passed By
109
Net Change
+4270
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#25680
5K → 10K9949+985#25680#24695
10K → 15K6703+667#24695#24028
15K → 20K5423+539#24028#23489
20K → Half1043+101#23489#23388
Half → 25K4675+462#23388#22926
25K → 30K4966+490#22926#22436
30K → 20M2291+228#22436#22208
20M → 21M2435+238#22208#21970
21M → 35K1014+97#21970#21873
35K → 23M1925+187#21873#21686
23M → 24M1129+103#21686#21583
24M → 40K10712+95#21583#21488
40K → 25.2M643+61#21488#21427
25.2M → Finish5841+17#21427#21410
TOTALS4379109+4270
📊

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