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BOSTON MARATHON 2026

Jaap Groenenberg

Bib: 13512•M

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0:00
0:00
/ mi
Masters
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Overall
#0 / 29021
Gender (Male)
#0 / 16340
Masters (Masters Men)
#0 / 10617
Age Group (M50-54)
#0 / 1868
Race Day Weather
51°/41°F
overcast clouds

Race Timeline and Course Information

Your journey through the course with elevation, pacing, and checkpoint details

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K
26:27
3.11 mi
Rank: #20154
Start → 5K
26:27 | 8:31/mi
10K
53:48
6.21 mi
Rank: #21079 (-925)
5K → 10K
27:21 | 8:49/mi
15K
1:21:34
9.32 mi
Rank: #21525 (-446)
10K → 15K
27:46 | 8:57/mi
20K
1:48:39
12.43 mi
Rank: #21259 (+266)
15K → 20K
27:05 | 8:44/mi
HALF
1:54:44
13.11 mi
Rank: #21319 (-60)
20K → HALF
6:05 | 8:56/mi
25K
2:16:10
15.53 mi
Rank: #21168 (+151)
HALF → 25K
21:26 | 8:51/mi
30K
2:44:48
18.64 mi
Rank: #21012 (+156)
25K → 30K
28:38 | 9:13/mi
20M
2:57:12
20.00 mi
Rank: #20916 (+96)
30K → 20M
12:24 | 9:08/mi
21M
3:06:48
21.00 mi
Rank: #20782 (+134)
20M → 21M
9:36 | 9:36/mi
35K
3:13:21
21.75 mi
Rank: #20701 (+81)
21M → 35K
6:33 | 8:46/mi
23M
3:24:37
23.00 mi
Rank: #20598 (+103)
35K → 23M
11:16 | 9:01/mi
24M
3:33:29
24.00 mi
Rank: #20514 (+84)
23M → 24M
8:52 | 8:52/mi
40K
3:41:05
24.85 mi
Rank: #20406 (+108)
24M → 40K
7:36 | 8:54/mi
25.2M
3:44:22
25.20 mi
Rank: #20366 (+40)
40K → 25.2M
3:17 | 9:32/mi
FINISH
3:53:27
26.22 mi
Rank: #20351 (+15)
25.2M → FINISH
9:05 | 8:55/mi

Splits & Pacing

Detailed breakdown of your race performance at each timing point

Half Splits

1st HalfFaster
via HALF
Distance13.11 mi
Time1:54:44
Pace8:46 /mi
2nd Half
Distance13.11 mi
Time1:58:43
Pace9:04 /mi
📊Positive Split: 3.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:55:4226:278:3126:27
8:31
-
10K
6.21 mi11:23:0353:488:4027:21
8:49
+0:18
15K
9.32 mi11:50:491:21:348:4627:46
8:57
+0:08
20K
12.43 mi12:17:541:48:398:4527:05
8:44
-0:13
HALF
13.11 mi12:23:591:54:448:466:05
8:56
+0:12
25K
15.53 mi12:45:252:16:108:4621:26
8:51
-0:05
30K
18.64 mi13:14:032:44:488:5128:38
9:13
+0:22
20M
20.00 mi13:26:272:57:128:5212:24
9:08
-0:05
21M
21.00 mi13:36:033:06:488:549:36
9:36
+0:28
35K
21.75 mi13:42:363:13:218:546:33
8:46
-0:50
23M
23.00 mi13:53:523:24:378:5411:16
9:01
+0:15
24M
24.00 mi14:02:443:33:298:548:52
8:52
-0:09
40K
24.85 mi14:10:203:41:058:547:36
8:54
+0:02
25.2M
25.20 mi14:13:373:44:228:553:17
9:32
+0:38
FINISH
26.22 mi14:22:423:53:278:559:05
8:55
-0:37

Checkpoint Splits Visualizations

Explore your race data through different visual perspectives. Scroll to discover each visualization.

📈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

8:31 /mi

Average Pace

8:55 /mi

Slowest Pace

9:36 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Bar length shows time spent in each segment. Colors mark your faster to slower segments, relative to your own pace.

Time at Faster Pace

3:40:34

94% of race

Time at Steady Pace

12:53

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:54 /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

Enhanced split table showing pace trends through mini sparkline visualizations.

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi10:55:4226:278:3126:27
8:31
#20154
10K
6.21 mi11:23:0353:488:4027:21
8:49
#21079
15K
9.32 mi11:50:491:21:348:4627:46
8:57
#21525
20K
12.43 mi12:17:541:48:398:4527:05
8:44
#21259
HALF
13.11 mi12:23:591:54:448:466:05
8:56
#21319
25K
15.53 mi12:45:252:16:108:4621:26
8:51
#21168
30K
18.64 mi13:14:032:44:488:5128:38
9:13
#21012
20M
20.00 mi13:26:272:57:128:5212:24
9:08
#20916
21M
21.00 mi13:36:033:06:488:549:36
9:36
#20782
35K
21.75 mi13:42:363:13:218:546:33
8:46
#20701
23M
23.00 mi13:53:523:24:378:5411:16
9:01
#20598
24M
24.00 mi14:02:443:33:298:548:52
8:52
#20514
40K
24.85 mi14:10:203:41:058:547:36
8:54
#20406
25.2M
25.20 mi14:13:373:44:228:553:17
9:32
#20366
FINISH
26.22 mi14:22:423:53:278:559:05
8:55
#20351
Faster pace
Steady pace
Slower pace

Rankings

Your position at each checkpoint and how you ranked in each segment

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi20154123521235222379(Top 77%)13468(Top 82%)13468(Top 721%)
10K6.21 mi3.10 mi21079-92512802-45012802-45021917(Top 76%)13213(Top 81%)13213(Top 707%)
15K9.32 mi3.11 mi21525-44613002-20013002-20022379(Top 77%)13468(Top 82%)13468(Top 721%)
20K12.43 mi3.11 mi21259+26612870+13212870+13220534(Top 71%)12537(Top 77%)12537(Top 671%)
HALF13.11 mi0.68 mi21319-6012897-2712897-2722353(Top 77%)13420(Top 82%)13420(Top 718%)
25K15.53 mi2.42 mi21168+15112825+7212825+7220401(Top 70%)12450(Top 76%)12450(Top 666%)
30K18.64 mi3.11 mi21012+15612734+9112734+9120578(Top 71%)12455(Top 76%)12455(Top 667%)
20M20.00 mi1.36 mi20916+9612678+5612678+5619548(Top 67%)11909(Top 73%)11909(Top 638%)
21M21.00 mi1.00 mi20782+13412613+6512613+6518944(Top 65%)11579(Top 71%)11579(Top 620%)
35K21.75 mi0.75 mi20701+8112559+5412559+5418878(Top 65%)11462(Top 70%)11462(Top 614%)
23M23.00 mi1.25 mi20598+10312499+6012499+6018504(Top 64%)11225(Top 69%)11225(Top 601%)
24M24.00 mi1.00 mi20514+8412445+5412445+5418851(Top 65%)11347(Top 69%)11347(Top 607%)
40K24.85 mi0.85 mi20406+10812377+6812377+6817843(Top 61%)10826(Top 66%)10826(Top 580%)
25.2M25.20 mi0.35 mi20366+4012348+2912348+2917403(Top 60%)10627(Top 65%)10627(Top 569%)
FINISH26.22 mi1.02 mi20351+1512330+1812330+1820147(Top 69%)11922(Top 73%)11922(Top 638%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 77%
×21
+97ft-345ft

Overall

22379

Males

13468

M50-54

13468

5K→10K

3.1 - 6.2 mi

Top 76%
×5
+79ft-138ft

Overall

21917

Males

13213

M50-54

13213

10K→15K

6.2 - 9.3 mi

Top 77%
×3
+67ft-78ft

Overall

22379

Males

13468

M50-54

13468

15K→20K

9.3 - 12.4 mi

Top 71%
×5
+106ft-86ft

Overall

20534

Males

12537

M50-54

12537

20K→HALF

12.4 - 13.1 mi

Top 77%
×2
+19ft-37ft

Overall

22353

Males

13420

M50-54

13420

HALF→25K

13.1 - 15.5 mi

Top 70%
×4
+66ft-88ft

Overall

20401

Males

12450

M50-54

12450

25K→30K

15.5 - 18.6 mi

Top 71%
×9
+181ft-148ft

Overall

20578

Males

12455

M50-54

12455

30K→20M

18.6 - 20.0 mi

Top 67%
×5
+64ft-50ft

Overall

19548

Males

11909

M50-54

11909

20M→21M

20.0 - 21.0 mi

Top 65%
×8
+106ft-24ft

Overall

18944

Males

11579

M50-54

11579

21M→35K

21.0 - 21.8 mi

Top 65%
×7
+17ft-86ft

Overall

18878

Males

11462

M50-54

11462

35K→23M

21.8 - 23.0 mi

Top 64%
×5
+23ft-63ft

Overall

18504

Males

11225

M50-54

11225

23M→24M

23.0 - 24.0 mi

Top 65%
×6
+12ft-82ft

Overall

18851

Males

11347

M50-54

11347

24M→40K

24.0 - 24.9 mi

Top 61%
×1
+6ft-20ft

Overall

17843

Males

10826

M50-54

10826

40K→25.2M

24.9 - 25.2 mi

Top 60%
×1
+13ft-16ft

Overall

17403

Males

10627

M50-54

10627

25.2M→FINISH

25.2 - 26.2 mi

Top 69%
×2
+22ft-21ft

Overall

20147

Males

11922

M50-54

11922

Passing

Athletes you passed and who passed you throughout the race

Passing Analysis

Category:
Athletes Passed
1717*
Passed By
815
Net Change
-197
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20154
5K → 10K62200-925#20154#21079
10K → 15K66200-446#21079#21525
15K → 20K317*51+266#21525#21259
20K → HALF2282-60#21259#21319
HALF → 25K18938+151#21319#21168
25K → 30K240*84+156#21168#21012
30K → 20M12024+96#21012#20916
20M → 21M15218+134#20916#20782
21M → 35K9211+81#20782#20701
35K → 23M12421+103#20701#20598
23M → 24M10218+84#20598#20514
24M → 40K11810+108#20514#20406
40K → 25.2M455+40#20406#20366
25.2M → FINISH6853+15#20366#20351
TOTALS1717*815-197

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

Passing Analysis Visualizations

Explore your passing analysis through 5 different visualizations. Scroll to discover each one.

Time:
Category:

📈Position Graph

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🎨Heatmap Timeline

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Activity Data

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing