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BOSTON MARATHON 2025

Alexander Kessler

Bib: 399•M

MA

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 3%
Gender (Male)
#0 / 16105
Top 6%
Division (M18-39)
#0 / 5642
Top 13%
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
5:57/mi
18:29
↑ 97↓ 3451.5%
10K· 6.21 mi
6:02/mi
37:15
↑ 79↓ 1380.4%
15K· 9.32 mi
5:57/mi
55:44
↑ 67↓ 78
20K· 12.43 mi
5:57/mi
1:14:13
↑ 106↓ 860.1%
Half· 13.11 mi
5:47/mi
1:18:10
↑ 19↓ 370.5%
25K· 15.53 mi
6:01/mi
1:32:46
↑ 66↓ 880.2%
30K· 18.64 mi
6:14/mi
1:52:08
↑ 181↓ 1480.2%
20M
6:26/mi
2:00:53
↑ 64↓ 500.2%
21M
6:48/mi
2:07:41
↑ 106↓ 241.6%
35K· 21.75 mi
6:22/mi
2:12:27
↑ 17↓ 861.7%
23M
6:32/mi
2:20:38
↑ 23↓ 630.6%
24M
6:25/mi
2:27:03
↓ 821.3%
40K· 24.85 mi
6:31/mi
2:32:37
↓ 200.3%
25.2M
7:03/mi
2:35:03
↑ 13↓ 160.2%
Finish· 26.22 mi
6:16/mi
2:41:26
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:18:10
Pace5:58 /mi
2nd Half
Distance13.11 mi
Time1:23:16
Pace6:21 /mi
📊Positive Split: 6.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:18:4018:295:5718:29
5:57
-
10K
6.21 mi10:37:2637:156:0018:46
6:02
+0:05
15K
9.32 mi10:55:5555:445:5918:29
5:57
-0:05
20K
12.43 mi11:14:241:14:135:5818:29
5:57
0:00
Half
13.11 mi11:18:211:18:105:583:57
5:47
-0:10
25K
15.53 mi11:32:571:32:465:5814:36
6:01
+0:14
30K
18.64 mi11:52:191:52:086:0119:22
6:14
+0:13
20M
20.00 mi12:01:042:00:536:038:45
6:26
+0:12
21M
21.00 mi12:07:522:07:416:056:48
6:48
+0:22
35K
21.75 mi12:12:382:12:276:054:46
6:22
-0:26
23M
23.00 mi12:20:492:20:386:078:11
6:32
+0:10
24M
24.00 mi12:27:142:27:036:086:25
6:25
-0:07
40K
24.85 mi12:32:482:32:376:085:34
6:31
+0:06
25.2M
25.20 mi12:35:142:35:036:092:26
7:03
+0:32
Finish
26.22 mi12:41:372:41:266:106:23
6:16
-0:47

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

5:47 /mi

Average Pace

6:10 /mi

Slowest Pace

7:03 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:32:46

57% of race

Time at Steady Pace

45:41

28% of race

Time at Slower Pace

22:59

14% of race

Average Pace: 6:09 /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 mi10:18:4018:295:5718:29
5:57
#929
10K
6.21 mi10:37:2637:156:0018:46
6:02
#1047
15K
9.32 mi10:55:5555:445:5918:29
5:57
#998
20K
12.43 mi11:14:241:14:135:5818:29
5:57
#926
Half
13.11 mi11:18:211:18:105:583:57
5:47
#902
25K
15.53 mi11:32:571:32:465:5814:36
6:01
#874
30K
18.64 mi11:52:191:52:086:0119:22
6:14
#868
20M
20.00 mi12:01:042:00:536:038:45
6:26
#877
21M
21.00 mi12:07:522:07:416:056:48
6:48
#879
35K
21.75 mi12:12:382:12:276:054:46
6:22
#894
23M
23.00 mi12:20:492:20:386:078:11
6:32
#915
24M
24.00 mi12:27:142:27:036:086:25
6:25
#935
40K
24.85 mi12:32:482:32:376:085:34
6:31
#937
25.2M
25.20 mi12:35:142:35:036:092:26
7:03
#942
Finish
26.22 mi12:41:372:41:266:106:23
6:16
#947
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi929871871886(Top 3%)834(Top 5%)834(Top 15%)
10K6.21 mi3.10 mi1047-118987-116987-1161226(Top 4%)1162(Top 7%)1162(Top 21%)
15K9.32 mi3.11 mi998+49941+46941+46886(Top 3%)834(Top 5%)834(Top 15%)
20K12.43 mi3.11 mi926+72871+70871+70744(Top 3%)696(Top 4%)696(Top 12%)
Half13.11 mi0.68 mi902+24849+22849+22574(Top 2%)540(Top 3%)540(Top 10%)
25K15.53 mi2.42 mi874+28822+27822+27864(Top 3%)811(Top 5%)811(Top 14%)
30K18.64 mi3.11 mi868+6816+6816+61010(Top 4%)950(Top 6%)950(Top 17%)
20M20.00 mi1.36 mi877-9825-9825-91357(Top 5%)1282(Top 8%)1282(Top 23%)
21M21.00 mi1.00 mi879-2826-1826-11510(Top 5%)1421(Top 9%)1421(Top 25%)
35K21.75 mi0.75 mi894-15840-14840-141855(Top 7%)1739(Top 11%)1739(Top 31%)
23M23.00 mi1.25 mi915-21859-19859-191568(Top 6%)1466(Top 9%)1466(Top 26%)
24M24.00 mi1.00 mi935-20878-19878-191692(Top 6%)1577(Top 10%)1577(Top 28%)
40K24.85 mi0.85 mi937-2880-2880-21611(Top 6%)1487(Top 9%)1487(Top 26%)
25.2M25.20 mi0.35 mi942-5885-5885-51594(Top 6%)1451(Top 9%)1451(Top 26%)
Finish26.22 mi1.02 mi947-5889-4889-41731(Top 6%)1601(Top 10%)1601(Top 28%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 3%
×21story building
+97ft-345ft

Overall

886

Males

834

M18-39

834

5K→10K

3.1 - 6.2 mi

Top 4%
×5story building
+79ft-138ft

Overall

1226

Males

1162

M18-39

1162

10K→15K

6.2 - 9.3 mi

Top 3%
×3story building
+67ft-78ft

Overall

886

Males

834

M18-39

834

15K→20K

9.3 - 12.4 mi

Top 3%
×5story building
+106ft-86ft

Overall

744

Males

696

M18-39

696

20K→Half

12.4 - 13.1 mi

Top 2%
×2story building
+19ft-37ft

Overall

574

Males

540

M18-39

540

Half→25K

13.1 - 15.5 mi

Top 3%
×4story building
+66ft-88ft

Overall

864

Males

811

M18-39

811

25K→30K

15.5 - 18.6 mi

Top 4%
×9story building
+181ft-148ft

Overall

1010

Males

950

M18-39

950

30K→20M

18.6 - 20.0 mi

Top 5%
×5story building
+64ft-50ft

Overall

1357

Males

1282

M18-39

1282

20M→21M

20.0 - 21.0 mi

Top 5%
×8story building
+106ft-24ft

Overall

1510

Males

1421

M18-39

1421

21M→35K

21.0 - 21.8 mi

Top 7%
×7story building
+17ft-86ft

Overall

1855

Males

1739

M18-39

1739

35K→23M

21.8 - 23.0 mi

Top 6%
×5story building
+23ft-63ft

Overall

1568

Males

1466

M18-39

1466

23M→24M

23.0 - 24.0 mi

Top 6%
×6story building
+12ft-82ft

Overall

1692

Males

1577

M18-39

1577

24M→40K

24.0 - 24.9 mi

Top 6%
×1story
+6ft-20ft

Overall

1611

Males

1487

M18-39

1487

40K→25.2M

24.9 - 25.2 mi

Top 6%
×1story
+13ft-16ft

Overall

1594

Males

1451

M18-39

1451

25.2M→Finish

25.2 - 26.2 mi

Top 6%
×2story building
+22ft-21ft

Overall

1731

Males

1601

M18-39

1601

Passing Analysis

Category:
Athletes Passed
367
Passed By
385
Net Change
-18
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#929
5K → 10K17135-118#929#1047
10K → 15K6213+49#1047#998
15K → 20K764+72#998#926
20K → Half240+24#926#902
Half → 25K379+28#902#874
25K → 30K4438+6#874#868
30K → 20M1928-9#868#877
20M → 21M2224-2#877#879
21M → 35K1126-15#879#894
35K → 23M1233-21#894#915
23M → 24M828-20#915#935
24M → 40K1517-2#935#937
40K → 25.2M510-5#937#942
25.2M → Finish1520-5#942#947
TOTALS367385-18
📊

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