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BOSTON MARATHON 2025

Byoungsun Park

Bib: 4466•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 14%
Gender (Male)
#0 / 16105
Top 23%
Masters (Masters Men)
#0 / 10463
Top 9%
Division (M50-54)
#0 / 1996
Top 5%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
20:12
Rank: #3837
Start → 5K
20:12 | 6:30/mi
10K· 6.21 mi
40:42
Rank: #4136 (-299)
5K → 10K
20:30 | 6:36/mi
15K· 9.32 mi
1:01:14
Rank: #4167 (-31)
10K → 15K
20:32 | 6:37/mi
20K· 12.43 mi
1:22:12
Rank: #4290 (-123)
15K → 20K
20:58 | 6:45/mi
Half· 13.11 mi
1:26:42
Rank: #4274 (+16)
20K → Half
4:30 | 6:36/mi
25K· 15.53 mi
1:43:04
Rank: #4252 (+22)
Half → 25K
16:22 | 6:45/mi
30K· 18.64 mi
2:04:45
Rank: #4246 (+6)
25K → 30K
21:41 | 6:59/mi
20M
2:14:14
Rank: #4190 (+56)
30K → 20M
9:29 | 6:59/mi
21M
2:21:43
Rank: #4189 (+1)
20M → 21M
7:29 | 7:29/mi
35K· 21.75 mi
2:26:43
Rank: #4146 (+43)
21M → 35K
5:00 | 6:41/mi
23M
2:35:23
Rank: #4065 (+81)
35K → 23M
8:40 | 6:55/mi
24M
2:42:08
Rank: #3996 (+69)
23M → 24M
6:45 | 6:45/mi
40K· 24.85 mi
2:48:03
Rank: #3938 (+58)
24M → 40K
5:55 | 6:55/mi
25.2M
2:50:46
Rank: #3956 (-18)
40K → 25.2M
2:43 | 7:53/mi
Finish· 26.22 mi
2:57:44
Rank: #3958 (-2)
25.2M → Finish
6:58 | 6:50/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:26:42
Pace6:37 /mi
2nd Half
Distance13.11 mi
Time1:31:02
Pace6:57 /mi
📊Positive Split: 5.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:5720:126:3020:12
6:30
-
10K
6.21 mi10:43:2740:426:3320:30
6:36
+0:06
15K
9.32 mi11:03:591:01:146:3420:32
6:37
+0:01
20K
12.43 mi11:24:571:22:126:3720:58
6:45
+0:08
Half
13.11 mi11:29:271:26:426:374:30
6:36
-0:09
25K
15.53 mi11:45:491:43:046:3816:22
6:45
+0:09
30K
18.64 mi12:07:302:04:456:4221:41
6:59
+0:14
20M
20.00 mi12:16:592:14:146:439:29
6:59
0:00
21M
21.00 mi12:24:282:21:436:457:29
7:29
+0:30
35K
21.75 mi12:29:282:26:436:455:00
6:41
-0:48
23M
23.00 mi12:38:082:35:236:458:40
6:55
+0:14
24M
24.00 mi12:44:532:42:086:456:45
6:45
-0:10
40K
24.85 mi12:50:482:48:036:465:55
6:55
+0:10
25.2M
25.20 mi12:53:312:50:466:472:43
7:53
+0:58
Finish
26.22 mi13:00:292:57:446:476:58
6:50
-1:03

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

6:30 /mi

Average Pace

6:47 /mi

Slowest Pace

7:53 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

20:12

11% of race

Time at Steady Pace

1:56:10

65% of race

Time at Slower Pace

41:22

23% of race

Average Pace: 6:47 /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 mi10:22:5720:126:3020:12
6:30
#3837
10K
6.21 mi10:43:2740:426:3320:30
6:36
#4136
15K
9.32 mi11:03:591:01:146:3420:32
6:37
#4167
20K
12.43 mi11:24:571:22:126:3720:58
6:45
#4290
Half
13.11 mi11:29:271:26:426:374:30
6:36
#4274
25K
15.53 mi11:45:491:43:046:3816:22
6:45
#4252
30K
18.64 mi12:07:302:04:456:4221:41
6:59
#4246
20M
20.00 mi12:16:592:14:146:439:29
6:59
#4190
21M
21.00 mi12:24:282:21:436:457:29
7:29
#4189
35K
21.75 mi12:29:282:26:436:455:00
6:41
#4146
23M
23.00 mi12:38:082:35:236:458:40
6:55
#4065
24M
24.00 mi12:44:532:42:086:456:45
6:45
#3996
40K
24.85 mi12:50:482:48:036:465:55
6:55
#3938
25.2M
25.20 mi12:53:312:50:466:472:43
7:53
#3956
Finish
26.22 mi13:00:292:57:446:476:58
6:50
#3958
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi3837363036304296(Top 15%)4034(Top 25%)4034(Top 202%)
10K6.21 mi3.10 mi4136-2993898-2683898-2684447(Top 16%)4166(Top 26%)4166(Top 209%)
15K9.32 mi3.11 mi4167-313924-263924-264296(Top 15%)4034(Top 25%)4034(Top 202%)
20K12.43 mi3.11 mi4290-1234034-1104034-1104816(Top 17%)4455(Top 28%)4455(Top 223%)
Half13.11 mi0.68 mi4274+164015+194015+194312(Top 15%)4034(Top 25%)4034(Top 202%)
25K15.53 mi2.42 mi4252+223988+273988+274470(Top 16%)4130(Top 26%)4130(Top 207%)
30K18.64 mi3.11 mi4246+63975+133975+134562(Top 16%)4163(Top 26%)4163(Top 209%)
20M20.00 mi1.36 mi4190+563921+543921+543964(Top 14%)3632(Top 23%)3632(Top 182%)
21M21.00 mi1.00 mi4189+13910+113910+114508(Top 16%)3998(Top 25%)3998(Top 200%)
35K21.75 mi0.75 mi4146+433863+473863+473396(Top 12%)3095(Top 19%)3095(Top 155%)
23M23.00 mi1.25 mi4065+813781+823781+823328(Top 12%)3026(Top 19%)3026(Top 152%)
24M24.00 mi1.00 mi3996+693713+683713+683215(Top 11%)2895(Top 18%)2895(Top 145%)
40K24.85 mi0.85 mi3938+583658+553658+553434(Top 12%)3053(Top 19%)3053(Top 153%)
25.2M25.20 mi0.35 mi3956-183670-123670-125212(Top 18%)4233(Top 26%)4233(Top 212%)
Finish26.22 mi1.02 mi3958-23657+133657+134690(Top 17%)3914(Top 24%)3914(Top 196%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 15%
×21stories
+97ft-345ft

Overall

4296

Males

4034

M50-54

4034

5K→10K

3.1 - 6.2 mi

Top 16%
×5stories
+79ft-138ft

Overall

4447

Males

4166

M50-54

4166

10K→15K

6.2 - 9.3 mi

Top 15%
×3stories
+67ft-78ft

Overall

4296

Males

4034

M50-54

4034

15K→20K

9.3 - 12.4 mi

Top 17%
×5stories
+106ft-86ft

Overall

4816

Males

4455

M50-54

4455

20K→Half

12.4 - 13.1 mi

Top 15%
×2stories
+19ft-37ft

Overall

4312

Males

4034

M50-54

4034

Half→25K

13.1 - 15.5 mi

Top 16%
×4stories
+66ft-88ft

Overall

4470

Males

4130

M50-54

4130

25K→30K

15.5 - 18.6 mi

Top 16%
×9stories
+181ft-148ft

Overall

4562

Males

4163

M50-54

4163

30K→20M

18.6 - 20.0 mi

Top 14%
×5stories
+64ft-50ft

Overall

3964

Males

3632

M50-54

3632

20M→21M

20.0 - 21.0 mi

Top 16%
×8stories
+106ft-24ft

Overall

4508

Males

3998

M50-54

3998

21M→35K

21.0 - 21.8 mi

Top 12%
×7stories
+17ft-86ft

Overall

3396

Males

3095

M50-54

3095

35K→23M

21.8 - 23.0 mi

Top 12%
×5stories
+23ft-63ft

Overall

3328

Males

3026

M50-54

3026

23M→24M

23.0 - 24.0 mi

Top 11%
×6stories
+12ft-82ft

Overall

3215

Males

2895

M50-54

2895

24M→40K

24.0 - 24.9 mi

Top 12%
×1story
+6ft-20ft

Overall

3434

Males

3053

M50-54

3053

40K→25.2M

24.9 - 25.2 mi

Top 18%
×1story
+13ft-16ft

Overall

5212

Males

4233

M50-54

4233

25.2M→Finish

25.2 - 26.2 mi

Top 17%
×2stories
+22ft-21ft

Overall

4690

Males

3914

M50-54

3914

Passing Analysis

Category:
Athletes Passed
1014
Passed By
1135
Net Change
-121
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#3837
5K → 10K49348-299#3837#4136
10K → 15K79110-31#4136#4167
15K → 20K59182-123#4167#4290
20K → Half3216+16#4290#4274
Half → 25K10179+22#4274#4252
25K → 30K142136+6#4252#4246
30K → 20M10347+56#4246#4190
20M → 21M5958+1#4190#4189
21M → 35K5613+43#4189#4146
35K → 23M11029+81#4146#4065
23M → 24M8213+69#4065#3996
24M → 40K7315+58#3996#3938
40K → 25.2M1634-18#3938#3956
25.2M → Finish5355-2#3956#3958
TOTALS10141135-121
📊

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