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BOSTON MARATHON 2025

Isaac Lee

Bib: 3373•M

IA

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 7%
Gender (Male)
#0 / 16105
Top 12%
Division (M18-39)
#0 / 5642
Top 29%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
18:44
Rank: #1159
Start → 5K
18:44 | 6:02/mi
10K· 6.21 mi
37:36
Rank: #1232 (-73)
5K → 10K
18:52 | 6:04/mi
15K· 9.32 mi
56:44
Rank: #1347 (-115)
10K → 15K
19:08 | 6:10/mi
20K· 12.43 mi
1:16:07
Rank: #1428 (-81)
15K → 20K
19:23 | 6:14/mi
Half· 13.11 mi
1:20:18
Rank: #1439 (-11)
20K → Half
4:11 | 6:08/mi
25K· 15.53 mi
1:35:31
Rank: #1466 (-27)
Half → 25K
15:13 | 6:17/mi
30K· 18.64 mi
1:57:27
Rank: #1949 (-483)
25K → 30K
21:56 | 7:04/mi
20M
2:06:50
Rank: #2022 (-73)
30K → 20M
9:23 | 6:54/mi
21M
2:13:54
Rank: #2045 (-23)
20M → 21M
7:04 | 7:04/mi
35K· 21.75 mi
2:18:51
Rank: #2062 (-17)
21M → 35K
4:57 | 6:37/mi
23M
2:27:31
Rank: #2086 (-24)
35K → 23M
8:40 | 6:55/mi
24M
2:34:23
Rank: #2126 (-40)
23M → 24M
6:52 | 6:52/mi
40K· 24.85 mi
2:40:15
Rank: #2140 (-14)
24M → 40K
5:52 | 6:52/mi
25.2M
2:42:47
Rank: #2133 (+7)
40K → 25.2M
2:32 | 7:21/mi
Finish· 26.22 mi
2:49:11
Rank: #2107 (+26)
25.2M → Finish
6:24 | 6:17/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:20:18
Pace6:08 /mi
2nd Half
Distance13.11 mi
Time1:28:53
Pace6:47 /mi
📊Positive Split: 10.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:19:3718:446:0218:44
6:02
-
10K
6.21 mi10:38:2937:366:0318:52
6:04
+0:02
15K
9.32 mi10:57:3756:446:0519:08
6:10
+0:06
20K
12.43 mi11:17:001:16:076:0719:23
6:14
+0:04
Half
13.11 mi11:21:111:20:186:084:11
6:08
-0:06
25K
15.53 mi11:36:241:35:316:0915:13
6:17
+0:09
30K
18.64 mi11:58:201:57:276:1821:56
7:04
+0:47
20M
20.00 mi12:07:432:06:506:209:23
6:54
-0:10
21M
21.00 mi12:14:472:13:546:237:04
7:04
+0:10
35K
21.75 mi12:19:442:18:516:234:57
6:37
-0:27
23M
23.00 mi12:28:242:27:316:258:40
6:55
+0:18
24M
24.00 mi12:35:162:34:236:266:52
6:52
-0:03
40K
24.85 mi12:41:082:40:156:275:52
6:52
0:00
25.2M
25.20 mi12:43:402:42:476:282:32
7:21
+0:29
Finish
26.22 mi12:50:042:49:116:276:24
6:17
-1:04

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

6:02 /mi

Average Pace

6:27 /mi

Slowest Pace

7:21 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:41:55

60% of race

Time at Steady Pace

4:57

3% of race

Time at Slower Pace

1:02:19

37% of race

Average Pace: 6:27 /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 mi10:19:3718:446:0218:44
6:02
#1159
10K
6.21 mi10:38:2937:366:0318:52
6:04
#1232
15K
9.32 mi10:57:3756:446:0519:08
6:10
#1347
20K
12.43 mi11:17:001:16:076:0719:23
6:14
#1428
Half
13.11 mi11:21:111:20:186:084:11
6:08
#1439
25K
15.53 mi11:36:241:35:316:0915:13
6:17
#1466
30K
18.64 mi11:58:201:57:276:1821:56
7:04
#1949
20M
20.00 mi12:07:432:06:506:209:23
6:54
#2022
21M
21.00 mi12:14:472:13:546:237:04
7:04
#2045
35K
21.75 mi12:19:442:18:516:234:57
6:37
#2062
23M
23.00 mi12:28:242:27:316:258:40
6:55
#2086
24M
24.00 mi12:35:162:34:236:266:52
6:52
#2126
40K
24.85 mi12:41:082:40:156:275:52
6:52
#2140
25.2M
25.20 mi12:43:402:42:476:282:32
7:21
#2133
Finish
26.22 mi12:50:042:49:116:276:24
6:17
#2107
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi1159109710971641(Top 6%)1557(Top 10%)1557(Top 28%)
10K6.21 mi3.10 mi1232-731169-721169-721373(Top 5%)1303(Top 8%)1303(Top 23%)
15K9.32 mi3.11 mi1347-1151280-1111280-1111641(Top 6%)1557(Top 10%)1557(Top 28%)
20K12.43 mi3.11 mi1428-811354-741354-741742(Top 6%)1656(Top 10%)1656(Top 29%)
Half13.11 mi0.68 mi1439-111365-111365-111663(Top 6%)1582(Top 10%)1582(Top 28%)
25K15.53 mi2.42 mi1466-271391-261391-261757(Top 6%)1669(Top 10%)1669(Top 30%)
30K18.64 mi3.11 mi1949-4831856-4651856-4655059(Top 18%)4583(Top 28%)4583(Top 81%)
20M20.00 mi1.36 mi2022-731926-701926-703517(Top 12%)3239(Top 20%)3239(Top 57%)
21M21.00 mi1.00 mi2045-231946-201946-202510(Top 9%)2336(Top 15%)2336(Top 41%)
35K21.75 mi0.75 mi2062-171961-151961-153001(Top 11%)2756(Top 17%)2756(Top 49%)
23M23.00 mi1.25 mi2086-241984-231984-233302(Top 12%)3000(Top 19%)3000(Top 53%)
24M24.00 mi1.00 mi2126-402021-372021-373863(Top 14%)3416(Top 21%)3416(Top 61%)
40K24.85 mi0.85 mi2140-142032-112032-113127(Top 11%)2800(Top 17%)2800(Top 50%)
25.2M25.20 mi0.35 mi2133+72025+72025+72673(Top 9%)2375(Top 15%)2375(Top 42%)
Finish26.22 mi1.02 mi2107+261999+261999+261807(Top 6%)1670(Top 10%)1670(Top 30%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 6%
×21stories
+97ft-345ft

Overall

1641

Males

1557

M18-39

1557

5K→10K

3.1 - 6.2 mi

Top 5%
×5stories
+79ft-138ft

Overall

1373

Males

1303

M18-39

1303

10K→15K

6.2 - 9.3 mi

Top 6%
×3stories
+67ft-78ft

Overall

1641

Males

1557

M18-39

1557

15K→20K

9.3 - 12.4 mi

Top 6%
×5stories
+106ft-86ft

Overall

1742

Males

1656

M18-39

1656

20K→Half

12.4 - 13.1 mi

Top 6%
×2stories
+19ft-37ft

Overall

1663

Males

1582

M18-39

1582

Half→25K

13.1 - 15.5 mi

Top 6%
×4stories
+66ft-88ft

Overall

1757

Males

1669

M18-39

1669

25K→30K

15.5 - 18.6 mi

Top 18%
×9stories
+181ft-148ft

Overall

5059

Males

4583

M18-39

4583

30K→20M

18.6 - 20.0 mi

Top 12%
×5stories
+64ft-50ft

Overall

3517

Males

3239

M18-39

3239

20M→21M

20.0 - 21.0 mi

Top 9%
×8stories
+106ft-24ft

Overall

2510

Males

2336

M18-39

2336

21M→35K

21.0 - 21.8 mi

Top 11%
×7stories
+17ft-86ft

Overall

3001

Males

2756

M18-39

2756

35K→23M

21.8 - 23.0 mi

Top 12%
×5stories
+23ft-63ft

Overall

3302

Males

3000

M18-39

3000

23M→24M

23.0 - 24.0 mi

Top 14%
×6stories
+12ft-82ft

Overall

3863

Males

3416

M18-39

3416

24M→40K

24.0 - 24.9 mi

Top 11%
×1story
+6ft-20ft

Overall

3127

Males

2800

M18-39

2800

40K→25.2M

24.9 - 25.2 mi

Top 9%
×1story
+13ft-16ft

Overall

2673

Males

2375

M18-39

2375

25.2M→Finish

25.2 - 26.2 mi

Top 6%
×2stories
+22ft-21ft

Overall

1807

Males

1670

M18-39

1670

Passing Analysis

Category:
Athletes Passed
347
Passed By
1295
Net Change
-948
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#1159
5K → 10K40113-73#1159#1232
10K → 15K16131-115#1232#1347
15K → 20K30111-81#1347#1428
20K → Half314-11#1428#1439
Half → 25K3764-27#1439#1466
25K → 30K7490-483#1466#1949
30K → 20M1588-73#1949#2022
20M → 21M2649-23#2022#2045
21M → 35K2138-17#2045#2062
35K → 23M3761-24#2062#2086
23M → 24M2565-40#2086#2126
24M → 40K2943-14#2126#2140
40K → 25.2M2114+7#2140#2133
25.2M → Finish4014+26#2133#2107
TOTALS3471295-948
📊

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