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BOSTON MARATHON 2025

Jonathan Groendyk

Bib: 795•M

MI

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 2%
Gender (Male)
#0 / 16105
Top 4%
Division (M18-39)
#0 / 5642
Top 9%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
18:34
Rank: #998
Start → 5K
18:34 | 5:59/mi
10K· 6.21 mi
37:00
Rank: #951 (+47)
5K → 10K
18:26 | 5:56/mi
15K· 9.32 mi
55:22
Rank: #896 (+55)
10K → 15K
18:22 | 5:55/mi
20K· 12.43 mi
1:14:00
Rank: #876 (+20)
15K → 20K
18:38 | 6:00/mi
Half· 13.11 mi
1:18:01
Rank: #870 (+6)
20K → Half
4:01 | 5:53/mi
25K· 15.53 mi
1:32:37
Rank: #854 (+16)
Half → 25K
14:36 | 6:01/mi
30K· 18.64 mi
1:51:32
Rank: #789 (+65)
25K → 30K
18:55 | 6:05/mi
20M
1:59:58
Rank: #769 (+20)
30K → 20M
8:26 | 6:12/mi
21M
2:06:24
Rank: #744 (+25)
20M → 21M
6:26 | 6:26/mi
35K· 21.75 mi
2:10:55
Rank: #731 (+13)
21M → 35K
4:31 | 6:02/mi
23M
2:18:36
Rank: #700 (+31)
35K → 23M
7:41 | 6:08/mi
24M
2:24:41
Rank: #691 (+9)
23M → 24M
6:05 | 6:05/mi
40K· 24.85 mi
2:29:58
Rank: #672 (+19)
24M → 40K
5:17 | 6:11/mi
25.2M
2:32:13
Rank: #663 (+9)
40K → 25.2M
2:15 | 6:31/mi
Finish· 26.22 mi
2:38:03
Rank: #652 (+11)
25.2M → Finish
5:50 | 5:43/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:18:01
Pace5:57 /mi
2nd Half
Distance13.11 mi
Time1:20:02
Pace6:06 /mi
📊Positive Split: 2.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:18:4718:345:5918:34
5:59
-
10K
6.21 mi10:37:1337:005:5718:26
5:56
-0:03
15K
9.32 mi10:55:3555:225:5618:22
5:55
-0:01
20K
12.43 mi11:14:131:14:005:5718:38
6:00
+0:05
Half
13.11 mi11:18:141:18:015:574:01
5:53
-0:07
25K
15.53 mi11:32:501:32:375:5814:36
6:01
+0:08
30K
18.64 mi11:51:451:51:325:5918:55
6:05
+0:04
20M
20.00 mi12:00:111:59:586:008:26
6:12
+0:07
21M
21.00 mi12:06:372:06:246:016:26
6:26
+0:14
35K
21.75 mi12:11:082:10:556:014:31
6:02
-0:24
23M
23.00 mi12:18:492:18:366:027:41
6:08
+0:06
24M
24.00 mi12:24:542:24:416:026:05
6:05
-0:03
40K
24.85 mi12:30:112:29:586:025:17
6:11
+0:06
25.2M
25.20 mi12:32:262:32:136:022:15
6:31
+0:20
Finish
26.22 mi12:38:162:38:036:025:50
5:43
-0:48

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

5:43 /mi

Average Pace

6:02 /mi

Slowest Pace

6:31 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:29:22

95% of race

Time at Steady Pace

8:41

5% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:02 /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 mi10:18:4718:345:5918:34
5:59
#998
10K
6.21 mi10:37:1337:005:5718:26
5:56
#951
15K
9.32 mi10:55:3555:225:5618:22
5:55
#896
20K
12.43 mi11:14:131:14:005:5718:38
6:00
#876
Half
13.11 mi11:18:141:18:015:574:01
5:53
#870
25K
15.53 mi11:32:501:32:375:5814:36
6:01
#854
30K
18.64 mi11:51:451:51:325:5918:55
6:05
#789
20M
20.00 mi12:00:111:59:586:008:26
6:12
#769
21M
21.00 mi12:06:372:06:246:016:26
6:26
#744
35K
21.75 mi12:11:082:10:556:014:31
6:02
#731
23M
23.00 mi12:18:492:18:366:027:41
6:08
#700
24M
24.00 mi12:24:542:24:416:026:05
6:05
#691
40K
24.85 mi12:30:112:29:586:025:17
6:11
#672
25.2M
25.20 mi12:32:262:32:136:022:15
6:31
#663
Finish
26.22 mi12:38:162:38:036:025:50
5:43
#652
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi998939939781(Top 3%)731(Top 5%)731(Top 13%)
10K6.21 mi3.10 mi951+47894+45894+45910(Top 3%)856(Top 5%)856(Top 15%)
15K9.32 mi3.11 mi896+55842+52842+52781(Top 3%)731(Top 5%)731(Top 13%)
20K12.43 mi3.11 mi876+20823+19823+19856(Top 3%)805(Top 5%)805(Top 14%)
Half13.11 mi0.68 mi870+6818+5818+5790(Top 3%)744(Top 5%)744(Top 13%)
25K15.53 mi2.42 mi854+16802+16802+16853(Top 3%)800(Top 5%)800(Top 14%)
30K18.64 mi3.11 mi789+65740+62740+62653(Top 2%)611(Top 4%)611(Top 11%)
20M20.00 mi1.36 mi769+20720+20720+20732(Top 3%)690(Top 4%)690(Top 12%)
21M21.00 mi1.00 mi744+25696+24696+24558(Top 2%)526(Top 3%)526(Top 9%)
35K21.75 mi0.75 mi731+13683+13683+13790(Top 3%)736(Top 5%)736(Top 13%)
23M23.00 mi1.25 mi700+31652+31652+31548(Top 2%)516(Top 3%)516(Top 9%)
24M24.00 mi1.00 mi691+9642+10642+10726(Top 3%)681(Top 4%)681(Top 12%)
40K24.85 mi0.85 mi672+19623+19623+19685(Top 2%)640(Top 4%)640(Top 11%)
25.2M25.20 mi0.35 mi663+9614+9614+9481(Top 2%)446(Top 3%)446(Top 8%)
Finish26.22 mi1.02 mi652+11603+11603+11390(Top 1%)366(Top 2%)366(Top 6%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 3%
×21stories
+97ft-345ft

Overall

781

Males

731

M18-39

731

5K→10K

3.1 - 6.2 mi

Top 3%
×5stories
+79ft-138ft

Overall

910

Males

856

M18-39

856

10K→15K

6.2 - 9.3 mi

Top 3%
×3stories
+67ft-78ft

Overall

781

Males

731

M18-39

731

15K→20K

9.3 - 12.4 mi

Top 3%
×5stories
+106ft-86ft

Overall

856

Males

805

M18-39

805

20K→Half

12.4 - 13.1 mi

Top 3%
×2stories
+19ft-37ft

Overall

790

Males

744

M18-39

744

Half→25K

13.1 - 15.5 mi

Top 3%
×4stories
+66ft-88ft

Overall

853

Males

800

M18-39

800

25K→30K

15.5 - 18.6 mi

Top 2%
×9stories
+181ft-148ft

Overall

653

Males

611

M18-39

611

30K→20M

18.6 - 20.0 mi

Top 3%
×5stories
+64ft-50ft

Overall

732

Males

690

M18-39

690

20M→21M

20.0 - 21.0 mi

Top 2%
×8stories
+106ft-24ft

Overall

558

Males

526

M18-39

526

21M→35K

21.0 - 21.8 mi

Top 3%
×7stories
+17ft-86ft

Overall

790

Males

736

M18-39

736

35K→23M

21.8 - 23.0 mi

Top 2%
×5stories
+23ft-63ft

Overall

548

Males

516

M18-39

516

23M→24M

23.0 - 24.0 mi

Top 3%
×6stories
+12ft-82ft

Overall

726

Males

681

M18-39

681

24M→40K

24.0 - 24.9 mi

Top 2%
×1story
+6ft-20ft

Overall

685

Males

640

M18-39

640

40K→25.2M

24.9 - 25.2 mi

Top 2%
×1story
+13ft-16ft

Overall

481

Males

446

M18-39

446

25.2M→Finish

25.2 - 26.2 mi

Top 1%
×2stories
+22ft-21ft

Overall

390

Males

366

M18-39

366

Passing Analysis

Category:
Athletes Passed
453
Passed By
107
Net Change
+346
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#998
5K → 10K7326+47#998#951
10K → 15K594+55#951#896
15K → 20K4222+20#896#876
20K → Half104+6#876#870
Half → 25K2812+16#870#854
25K → 30K716+65#854#789
30K → 20M3111+20#789#769
20M → 21M305+25#769#744
21M → 35K163+13#744#731
35K → 23M332+31#731#700
23M → 24M156+9#700#691
24M → 40K234+19#691#672
40K → 25.2M101+9#672#663
25.2M → Finish121+11#663#652
TOTALS453107+346
📊

Passing Visuals

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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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing