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BOSTON MARATHON 2025

Alexander London

Bib: 25832•M

NH

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

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
25:46
Rank: #18664
Start → 5K
25:46 | 8:18/mi
10K· 6.21 mi
51:37
Rank: #18659 (+5)
5K → 10K
25:51 | 8:19/mi
15K· 9.32 mi
1:18:22
Rank: #19071 (-412)
10K → 15K
26:45 | 8:37/mi
20K· 12.43 mi
1:45:44
Rank: #19319 (-248)
15K → 20K
27:22 | 8:49/mi
Half· 13.11 mi
1:51:48
Rank: #19448 (-129)
20K → Half
6:04 | 8:54/mi
25K· 15.53 mi
2:13:43
Rank: #19559 (-111)
Half → 25K
21:55 | 9:02/mi
30K· 18.64 mi
2:44:31
Rank: #20022 (-463)
25K → 30K
30:48 | 9:55/mi
20M
2:58:49
Rank: #20273 (-251)
30K → 20M
14:18 | 10:31/mi
21M
3:09:40
Rank: #20341 (-68)
20M → 21M
10:51 | 10:51/mi
35K· 21.75 mi
3:16:32
Rank: #20288 (+53)
21M → 35K
6:52 | 9:11/mi
23M
3:29:56
Rank: #20500 (-212)
35K → 23M
13:24 | 10:42/mi
24M
3:40:35
Rank: #20689 (-189)
23M → 24M
10:39 | 10:39/mi
40K· 24.85 mi
3:50:26
Rank: #20894 (-205)
24M → 40K
9:51 | 11:31/mi
25.2M
3:54:43
Rank: #20949 (-55)
40K → 25.2M
4:17 | 12:25/mi
Finish· 26.22 mi
4:05:47
Rank: #21164 (-215)
25.2M → Finish
11:04 | 10:52/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:51:48
Pace8:32 /mi
2nd Half
Distance13.11 mi
Time2:13:59
Pace10:13 /mi
📊Positive Split: 19.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:41:0525:468:1825:46
8:18
-
10K
6.21 mi12:06:5651:378:1825:51
8:19
+0:01
15K
9.32 mi12:33:411:18:228:2426:45
8:37
+0:18
20K
12.43 mi13:01:031:45:448:3027:22
8:49
+0:12
Half
13.11 mi13:07:071:51:488:326:04
8:54
+0:05
25K
15.53 mi13:29:022:13:438:3621:55
9:02
+0:08
30K
18.64 mi13:59:502:44:318:5030:48
9:55
+0:53
20M
20.00 mi14:14:082:58:498:5614:18
10:31
+0:36
21M
21.00 mi14:24:593:09:409:0210:51
10:51
+0:20
35K
21.75 mi14:31:513:16:329:026:52
9:11
-1:40
23M
23.00 mi14:45:153:29:569:0813:24
10:42
+1:31
24M
24.00 mi14:55:543:40:359:1110:39
10:39
-0:03
40K
24.85 mi15:05:453:50:269:169:51
11:31
+0:52
25.2M
25.20 mi15:10:023:54:439:194:17
12:25
+0:54
Finish
26.22 mi15:21:064:05:479:2311:04
10:52
-1:33

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

8:18 /mi

Average Pace

9:23 /mi

Slowest Pace

12:25 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:20:35

57% of race

Time at Steady Pace

45:06

18% of race

Time at Slower Pace

1:00:06

24% of race

Average Pace: 9:22 /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 mi11:41:0525:468:1825:46
8:18
#18664
10K
6.21 mi12:06:5651:378:1825:51
8:19
#18659
15K
9.32 mi12:33:411:18:228:2426:45
8:37
#19071
20K
12.43 mi13:01:031:45:448:3027:22
8:49
#19319
Half
13.11 mi13:07:071:51:488:326:04
8:54
#19448
25K
15.53 mi13:29:022:13:438:3621:55
9:02
#19559
30K
18.64 mi13:59:502:44:318:5030:48
9:55
#20022
20M
20.00 mi14:14:082:58:498:5614:18
10:31
#20273
21M
21.00 mi14:24:593:09:409:0210:51
10:51
#20341
35K
21.75 mi14:31:513:16:329:026:52
9:11
#20288
23M
23.00 mi14:45:153:29:569:0813:24
10:42
#20500
24M
24.00 mi14:55:543:40:359:1110:39
10:39
#20689
40K
24.85 mi15:05:453:50:269:169:51
11:31
#20894
25.2M
25.20 mi15:10:023:54:439:194:17
12:25
#20949
Finish
26.22 mi15:21:064:05:479:2311:04
10:52
#21164
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi18664118961189619976(Top 70%)12497(Top 78%)12497(Top 221%)
10K6.21 mi3.10 mi18659+511891+511891+518672(Top 66%)11931(Top 74%)11931(Top 211%)
15K9.32 mi3.11 mi19071-41212067-17612067-17619976(Top 70%)12497(Top 78%)12497(Top 221%)
20K12.43 mi3.11 mi19319-24812171-10412171-10419974(Top 70%)12455(Top 77%)12455(Top 221%)
Half13.11 mi0.68 mi19448-12912232-6112232-6121323(Top 75%)13053(Top 81%)13053(Top 231%)
25K15.53 mi2.42 mi19559-11112276-4412276-4420081(Top 71%)12453(Top 77%)12453(Top 221%)
30K18.64 mi3.11 mi20022-46312427-15112427-15121346(Top 75%)12869(Top 80%)12869(Top 228%)
20M20.00 mi1.36 mi20273-25112509-8212509-8222485(Top 79%)13275(Top 82%)13275(Top 235%)
21M21.00 mi1.00 mi20341-6812516-712516-720972(Top 74%)12480(Top 77%)12480(Top 221%)
35K21.75 mi0.75 mi20288+5312479+3712479+3719089(Top 67%)11553(Top 72%)11553(Top 205%)
23M23.00 mi1.25 mi20500-21212561-8212561-8222518(Top 79%)13109(Top 81%)13109(Top 232%)
24M24.00 mi1.00 mi20689-18912627-6612627-6623187(Top 82%)13397(Top 83%)13397(Top 237%)
40K24.85 mi0.85 mi20894-20512697-7012697-7024168(Top 85%)13855(Top 86%)13855(Top 246%)
25.2M25.20 mi0.35 mi20949-5512711-1412711-1424023(Top 85%)13772(Top 86%)13772(Top 244%)
Finish26.22 mi1.02 mi21164-21512793-8212793-8225078(Top 88%)14321(Top 89%)14321(Top 254%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 70%
×21stories
+97ft-345ft

Overall

19976

Males

12497

M18-39

12497

5K→10K

3.1 - 6.2 mi

Top 66%
×5stories
+79ft-138ft

Overall

18672

Males

11931

M18-39

11931

10K→15K

6.2 - 9.3 mi

Top 70%
×3stories
+67ft-78ft

Overall

19976

Males

12497

M18-39

12497

15K→20K

9.3 - 12.4 mi

Top 70%
×5stories
+106ft-86ft

Overall

19974

Males

12455

M18-39

12455

20K→Half

12.4 - 13.1 mi

Top 75%
×2stories
+19ft-37ft

Overall

21323

Males

13053

M18-39

13053

Half→25K

13.1 - 15.5 mi

Top 71%
×4stories
+66ft-88ft

Overall

20081

Males

12453

M18-39

12453

25K→30K

15.5 - 18.6 mi

Top 75%
×9stories
+181ft-148ft

Overall

21346

Males

12869

M18-39

12869

30K→20M

18.6 - 20.0 mi

Top 79%
×5stories
+64ft-50ft

Overall

22485

Males

13275

M18-39

13275

20M→21M

20.0 - 21.0 mi

Top 74%
×8stories
+106ft-24ft

Overall

20972

Males

12480

M18-39

12480

21M→35K

21.0 - 21.8 mi

Top 67%
×7stories
+17ft-86ft

Overall

19089

Males

11553

M18-39

11553

35K→23M

21.8 - 23.0 mi

Top 79%
×5stories
+23ft-63ft

Overall

22518

Males

13109

M18-39

13109

23M→24M

23.0 - 24.0 mi

Top 82%
×6stories
+12ft-82ft

Overall

23187

Males

13397

M18-39

13397

24M→40K

24.0 - 24.9 mi

Top 85%
×1story
+6ft-20ft

Overall

24168

Males

13855

M18-39

13855

40K→25.2M

24.9 - 25.2 mi

Top 85%
×1story
+13ft-16ft

Overall

24023

Males

13772

M18-39

13772

25.2M→Finish

25.2 - 26.2 mi

Top 88%
×2stories
+22ft-21ft

Overall

25078

Males

14321

M18-39

14321

Passing Analysis

Category:
Athletes Passed
1012
Passed By
3512
Net Change
-2500
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18664
5K → 10K267262+5#18664#18659
10K → 15K83495-412#18659#19071
15K → 20K120368-248#19071#19319
20K → Half7136-129#19319#19448
Half → 25K134245-111#19448#19559
25K → 30K100563-463#19559#20022
30K → 20M46297-251#20022#20273
20M → 21M73141-68#20273#20341
21M → 35K7825+53#20341#20288
35K → 23M45257-212#20288#20500
23M → 24M22211-189#20500#20689
24M → 40K16221-205#20689#20894
40K → 25.2M1368-55#20894#20949
25.2M → Finish8223-215#20949#21164
TOTALS10123512-2500
📊

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