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BOSTON MARATHON 2025

Justin Ellerbroek

Bib: 10710•M

IA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 33%
Gender (Male)
#0 / 16105
Top 46%
Masters (Masters Men)
#0 / 10463
Top 35%
Division (M45-49)
#0 / 2386
Top 50%
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
7:06/mi
22:04
↑ 97↓ 3451.5%
10K· 6.21 mi
7:03/mi
43:59
↑ 79↓ 1380.4%
15K· 9.32 mi
7:04/mi
1:05:55
↑ 67↓ 78
20K· 12.43 mi
7:08/mi
1:28:05
↑ 106↓ 860.1%
Half· 13.11 mi
7:01/mi
1:32:52
↑ 19↓ 370.5%
25K· 15.53 mi
7:08/mi
1:50:10
↑ 66↓ 880.2%
30K· 18.64 mi
7:23/mi
2:13:05
↑ 181↓ 1480.2%
20M
7:27/mi
2:23:12
↑ 64↓ 500.2%
21M
9:54/mi
2:33:06
↑ 106↓ 241.6%
35K· 21.75 mi
8:49/mi
2:39:42
↑ 17↓ 861.7%
23M
8:45/mi
2:50:39
↑ 23↓ 630.6%
24M
8:23/mi
2:59:02
↓ 821.3%
40K· 24.85 mi
8:56/mi
3:06:40
↓ 200.3%
25.2M
9:08/mi
3:09:49
↑ 13↓ 160.2%
Finish· 26.22 mi
7:48/mi
3:17:46
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:32:52
Pace7:05 /mi
2nd Half
Distance13.11 mi
Time1:44:54
Pace8:00 /mi
📊Positive Split: 13.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:48:4222:047:0622:04
7:06
-
10K
6.21 mi11:10:3743:597:0521:55
7:03
-0:03
15K
9.32 mi11:32:331:05:557:0421:56
7:04
+0:01
20K
12.43 mi11:54:431:28:057:0522:10
7:08
+0:04
Half
13.11 mi11:59:301:32:527:054:47
7:01
-0:07
25K
15.53 mi12:16:481:50:107:0617:18
7:08
+0:07
30K
18.64 mi12:39:432:13:057:0822:55
7:23
+0:15
20M
20.00 mi12:49:502:23:127:1010:07
7:27
+0:04
21M
21.00 mi12:59:442:33:067:179:54
9:54
+2:27
35K
21.75 mi13:06:202:39:427:216:36
8:49
-1:05
23M
23.00 mi13:17:172:50:397:2510:57
8:45
-0:04
24M
24.00 mi13:25:402:59:027:288:23
8:23
-0:22
40K
24.85 mi13:33:183:06:407:317:38
8:56
+0:33
25.2M
25.20 mi13:36:273:09:497:323:09
9:08
+0:12
Finish
26.22 mi13:44:243:17:467:337:57
7:48
-1:20

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

7:01 /mi

Average Pace

7:33 /mi

Slowest Pace

9:54 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

0:00

0% of race

Time at Steady Pace

2:31:09

76% of race

Time at Slower Pace

46:37

24% of race

Average Pace: 7:33 /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 mi10:48:4222:047:0622:04
7:06
#8661
10K
6.21 mi11:10:3743:597:0521:55
7:03
#8488
15K
9.32 mi11:32:331:05:557:0421:56
7:04
#8287
20K
12.43 mi11:54:431:28:057:0522:10
7:08
#8085
Half
13.11 mi11:59:301:32:527:054:47
7:01
#8055
25K
15.53 mi12:16:481:50:107:0617:18
7:08
#7874
30K
18.64 mi12:39:432:13:057:0822:55
7:23
#7611
20M
20.00 mi12:49:502:23:127:1010:07
7:27
#7453
21M
21.00 mi12:59:442:33:067:179:54
9:54
#8052
35K
21.75 mi13:06:202:39:427:216:36
8:49
#8414
23M
23.00 mi13:17:172:50:397:2510:57
8:45
#8798
24M
24.00 mi13:25:402:59:027:288:23
8:23
#9029
40K
24.85 mi13:33:183:06:407:317:38
8:56
#9329
25.2M
25.20 mi13:36:273:09:497:323:09
9:08
#9370
Finish
26.22 mi13:44:243:17:467:337:57
7:48
#9440
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi8661741974198037(Top 28%)6967(Top 43%)6967(Top 292%)
10K6.21 mi3.10 mi8488+1737291+1287291+1288322(Top 29%)7185(Top 45%)7185(Top 301%)
15K9.32 mi3.11 mi8287+2017150+1417150+1418037(Top 28%)6967(Top 43%)6967(Top 292%)
20K12.43 mi3.11 mi8085+2027011+1397011+1397720(Top 27%)6691(Top 42%)6691(Top 280%)
Half13.11 mi0.68 mi8055+306986+256986+257679(Top 27%)6700(Top 42%)6700(Top 281%)
25K15.53 mi2.42 mi7874+1816855+1316855+1317193(Top 25%)6252(Top 39%)6252(Top 262%)
30K18.64 mi3.11 mi7611+2636634+2216634+2216915(Top 24%)5920(Top 37%)5920(Top 248%)
20M20.00 mi1.36 mi7453+1586496+1386496+1386670(Top 23%)5630(Top 35%)5630(Top 236%)
21M21.00 mi1.00 mi8052-5996833-3376833-33717873(Top 63%)11094(Top 69%)11094(Top 465%)
35K21.75 mi0.75 mi8414-3627033-2007033-20017320(Top 61%)10724(Top 67%)10724(Top 449%)
23M23.00 mi1.25 mi8798-3847222-1897222-18914771(Top 52%)9515(Top 59%)9515(Top 399%)
24M24.00 mi1.00 mi9029-2317324-1027324-10213723(Top 48%)9001(Top 56%)9001(Top 377%)
40K24.85 mi0.85 mi9329-3007448-1247448-12415865(Top 56%)9841(Top 61%)9841(Top 412%)
25.2M25.20 mi0.35 mi9370-417455-77455-712471(Top 44%)8200(Top 51%)8200(Top 344%)
Finish26.22 mi1.02 mi9440-707456-17456-111414(Top 40%)7709(Top 48%)7709(Top 323%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 28%
×21story building
+97ft-345ft

Overall

8037

Males

6967

M45-49

6967

5K→10K

3.1 - 6.2 mi

Top 29%
×5story building
+79ft-138ft

Overall

8322

Males

7185

M45-49

7185

10K→15K

6.2 - 9.3 mi

Top 28%
×3story building
+67ft-78ft

Overall

8037

Males

6967

M45-49

6967

15K→20K

9.3 - 12.4 mi

Top 27%
×5story building
+106ft-86ft

Overall

7720

Males

6691

M45-49

6691

20K→Half

12.4 - 13.1 mi

Top 27%
×2story building
+19ft-37ft

Overall

7679

Males

6700

M45-49

6700

Half→25K

13.1 - 15.5 mi

Top 25%
×4story building
+66ft-88ft

Overall

7193

Males

6252

M45-49

6252

25K→30K

15.5 - 18.6 mi

Top 24%
×9story building
+181ft-148ft

Overall

6915

Males

5920

M45-49

5920

30K→20M

18.6 - 20.0 mi

Top 23%
×5story building
+64ft-50ft

Overall

6670

Males

5630

M45-49

5630

20M→21M

20.0 - 21.0 mi

Top 63%
×8story building
+106ft-24ft

Overall

17873

Males

11094

M45-49

11094

21M→35K

21.0 - 21.8 mi

Top 61%
×7story building
+17ft-86ft

Overall

17320

Males

10724

M45-49

10724

35K→23M

21.8 - 23.0 mi

Top 52%
×5story building
+23ft-63ft

Overall

14771

Males

9515

M45-49

9515

23M→24M

23.0 - 24.0 mi

Top 48%
×6story building
+12ft-82ft

Overall

13723

Males

9001

M45-49

9001

24M→40K

24.0 - 24.9 mi

Top 56%
×1story
+6ft-20ft

Overall

15865

Males

9841

M45-49

9841

40K→25.2M

24.9 - 25.2 mi

Top 44%
×1story
+13ft-16ft

Overall

12471

Males

8200

M45-49

8200

25.2M→Finish

25.2 - 26.2 mi

Top 40%
×2story building
+22ft-21ft

Overall

11414

Males

7709

M45-49

7709

Passing Analysis

Category:
Athletes Passed
1790
Passed By
2569
Net Change
-779
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8661
5K → 10K304131+173#8661#8488
10K → 15K26463+201#8488#8287
15K → 20K25856+202#8287#8085
20K → Half4616+30#8085#8055
Half → 25K21332+181#8055#7874
25K → 30K33168+263#7874#7611
30K → 20M18022+158#7611#7453
20M → 21M13612-599#7453#8052
21M → 35K10372-362#8052#8414
35K → 23M45429-384#8414#8798
23M → 24M23254-231#8798#9029
24M → 40K30330-300#9029#9329
40K → 25.2M2768-41#9329#9370
25.2M → Finish46116-70#9370#9440
TOTALS17902569-779
📊

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