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BOSTON MARATHON 2025

Alexander Cornwell

Bib: 1711•M

NC

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 18%
Gender (Male)
#0 / 16105
Top 29%
Division (M18-39)
#0 / 5642
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
6:19/mi
19:39
↑ 97↓ 3451.5%
10K· 6.21 mi
6:01/mi
38:21
↑ 79↓ 1380.4%
15K· 9.32 mi
6:01/mi
57:02
↑ 67↓ 78
20K· 12.43 mi
6:18/mi
1:16:36
↑ 106↓ 860.1%
Half· 13.11 mi
6:14/mi
1:20:51
↑ 19↓ 370.5%
25K· 15.53 mi
6:23/mi
1:36:19
↑ 66↓ 880.2%
30K· 18.64 mi
6:55/mi
1:57:48
↑ 181↓ 1480.2%
20M
7:56/mi
2:08:35
↑ 64↓ 500.2%
21M
8:47/mi
2:17:22
↑ 106↓ 241.6%
35K· 21.75 mi
8:53/mi
2:24:01
↑ 17↓ 861.7%
23M
10:30/mi
2:37:10
↑ 23↓ 630.6%
24M
7:46/mi
2:44:56
↓ 821.3%
40K· 24.85 mi
8:03/mi
2:51:49
↓ 200.3%
25.2M
8:10/mi
2:54:38
↑ 13↓ 160.2%
Finish· 26.22 mi
7:08/mi
3:01:54
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:20:51
Pace6:10 /mi
2nd Half
Distance13.11 mi
Time1:41:03
Pace7:43 /mi
📊Positive Split: 25.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:20:1719:396:1919:39
6:19
-
10K
6.21 mi10:38:5938:216:1018:42
6:01
-0:18
15K
9.32 mi10:57:4057:026:0718:41
6:01
0:00
20K
12.43 mi11:17:141:16:366:1019:34
6:18
+0:17
Half
13.11 mi11:21:291:20:516:104:15
6:14
-0:04
25K
15.53 mi11:36:571:36:196:1215:28
6:23
+0:09
30K
18.64 mi11:58:261:57:486:1921:29
6:55
+0:32
20M
20.00 mi12:09:132:08:356:2610:47
7:56
+1:01
21M
21.00 mi12:18:002:17:226:328:47
8:47
+0:51
35K
21.75 mi12:24:392:24:016:376:39
8:53
+0:06
23M
23.00 mi12:37:482:37:106:5013:09
10:30
+1:37
24M
24.00 mi12:45:342:44:566:527:46
7:46
-2:44
40K
24.85 mi12:52:272:51:496:556:53
8:03
+0:17
25.2M
25.20 mi12:55:162:54:386:562:49
8:10
+0:07
Finish
26.22 mi13:02:323:01:546:577:16
7:08
-1:02

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

6:01 /mi

Average Pace

6:57 /mi

Slowest Pace

10:30 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:36:19

53% of race

Time at Steady Pace

28:45

16% of race

Time at Slower Pace

56:50

31% of race

Average Pace: 6:56 /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 mi10:20:1719:396:1919:39
6:19
#2596
10K
6.21 mi10:38:5938:216:1018:42
6:01
#1736
15K
9.32 mi10:57:4057:026:0718:41
6:01
#1479
20K
12.43 mi11:17:141:16:366:1019:34
6:18
#1588
Half
13.11 mi11:21:291:20:516:104:15
6:14
#1617
25K
15.53 mi11:36:571:36:196:1215:28
6:23
#1682
30K
18.64 mi11:58:261:57:486:1921:29
6:55
#2034
20M
20.00 mi12:09:132:08:356:2610:47
7:56
#2461
21M
21.00 mi12:18:002:17:226:328:47
8:47
#2907
35K
21.75 mi12:24:392:24:016:376:39
8:53
#3335
23M
23.00 mi12:37:482:37:106:5013:09
10:30
#4649
24M
24.00 mi12:45:342:44:566:527:46
7:46
#4921
40K
24.85 mi12:52:272:51:496:556:53
8:03
#5087
25.2M
25.20 mi12:55:162:54:386:562:49
8:10
#5094
Finish
26.22 mi13:02:323:01:546:577:16
7:08
#5094
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi2596247224721078(Top 4%)1019(Top 6%)1019(Top 18%)
10K6.21 mi3.10 mi1736+8601651+8211651+8211159(Top 4%)1097(Top 7%)1097(Top 19%)
15K9.32 mi3.11 mi1479+2571404+2471404+2471078(Top 4%)1019(Top 6%)1019(Top 18%)
20K12.43 mi3.11 mi1588-1091507-1031507-1032002(Top 7%)1907(Top 12%)1907(Top 34%)
Half13.11 mi0.68 mi1617-291534-271534-272146(Top 8%)2050(Top 13%)2050(Top 36%)
25K15.53 mi2.42 mi1682-651599-651599-652255(Top 8%)2145(Top 13%)2145(Top 38%)
30K18.64 mi3.11 mi2034-3521938-3391938-3394172(Top 15%)3835(Top 24%)3835(Top 68%)
20M20.00 mi1.36 mi2461-4272347-4092347-4099972(Top 35%)7518(Top 47%)7518(Top 133%)
21M21.00 mi1.00 mi2907-4462762-4152762-41512149(Top 43%)8425(Top 52%)8425(Top 149%)
35K21.75 mi0.75 mi3335-4283150-3883150-38817656(Top 62%)10882(Top 68%)10882(Top 193%)
23M23.00 mi1.25 mi4649-13144285-11354285-113522015(Top 78%)12878(Top 80%)12878(Top 228%)
24M24.00 mi1.00 mi4921-2724507-2224507-2229510(Top 33%)6902(Top 43%)6902(Top 122%)
40K24.85 mi0.85 mi5087-1664635-1284635-12810493(Top 37%)7278(Top 45%)7278(Top 129%)
25.2M25.20 mi0.35 mi5094-74637-24637-26774(Top 24%)5193(Top 32%)5193(Top 92%)
Finish26.22 mi1.02 mi50944626+114626+116530(Top 23%)5042(Top 31%)5042(Top 89%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 4%
×21story building
+97ft-345ft

Overall

1078

Males

1019

M18-39

1019

5K→10K

3.1 - 6.2 mi

Top 4%
×5story building
+79ft-138ft

Overall

1159

Males

1097

M18-39

1097

10K→15K

6.2 - 9.3 mi

Top 4%
×3story building
+67ft-78ft

Overall

1078

Males

1019

M18-39

1019

15K→20K

9.3 - 12.4 mi

Top 7%
×5story building
+106ft-86ft

Overall

2002

Males

1907

M18-39

1907

20K→Half

12.4 - 13.1 mi

Top 8%
×2story building
+19ft-37ft

Overall

2146

Males

2050

M18-39

2050

Half→25K

13.1 - 15.5 mi

Top 8%
×4story building
+66ft-88ft

Overall

2255

Males

2145

M18-39

2145

25K→30K

15.5 - 18.6 mi

Top 15%
×9story building
+181ft-148ft

Overall

4172

Males

3835

M18-39

3835

30K→20M

18.6 - 20.0 mi

Top 35%
×5story building
+64ft-50ft

Overall

9972

Males

7518

M18-39

7518

20M→21M

20.0 - 21.0 mi

Top 43%
×8story building
+106ft-24ft

Overall

12149

Males

8425

M18-39

8425

21M→35K

21.0 - 21.8 mi

Top 62%
×7story building
+17ft-86ft

Overall

17656

Males

10882

M18-39

10882

35K→23M

21.8 - 23.0 mi

Top 78%
×5story building
+23ft-63ft

Overall

22015

Males

12878

M18-39

12878

23M→24M

23.0 - 24.0 mi

Top 33%
×6story building
+12ft-82ft

Overall

9510

Males

6902

M18-39

6902

24M→40K

24.0 - 24.9 mi

Top 37%
×1story
+6ft-20ft

Overall

10493

Males

7278

M18-39

7278

40K→25.2M

24.9 - 25.2 mi

Top 24%
×1story
+13ft-16ft

Overall

6774

Males

5193

M18-39

5193

25.2M→Finish

25.2 - 26.2 mi

Top 23%
×2story building
+22ft-21ft

Overall

6530

Males

5042

M18-39

5042

Passing Analysis

Category:
Athletes Passed
1311
Passed By
3809
Net Change
-2498
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#2596
5K → 10K8611+860#2596#1736
10K → 15K2592+257#1736#1479
15K → 20K29138-109#1479#1588
20K → Half130-29#1588#1617
Half → 25K2893-65#1617#1682
25K → 30K17369-352#1682#2034
30K → 20M3430-427#2034#2461
20M → 21M5451-446#2461#2907
21M → 35K4432-428#2907#3335
35K → 23M41318-1314#3335#4649
23M → 24M15287-272#4649#4921
24M → 40K22188-166#4921#5087
40K → 25.2M2330-7#5087#5094
25.2M → Finish40400#5094#5094
TOTALS13113809-2498
📊

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