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BOSTON MARATHON 2025

Brennan Clark

Bib: 27240•M

MA

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

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
29:44
Rank: #24470
Start → 5K
29:44 | 9:34/mi
10K· 6.21 mi
57:39
Rank: #23470 (+1000)
5K → 10K
27:55 | 8:59/mi
15K· 9.32 mi
1:25:19
Rank: #22919 (+551)
10K → 15K
27:40 | 8:54/mi
20K· 12.43 mi
1:53:52
Rank: #22635 (+284)
15K → 20K
28:33 | 9:11/mi
Half· 13.11 mi
1:59:57
Rank: #22570 (+65)
20K → Half
6:05 | 8:55/mi
25K· 15.53 mi
2:23:00
Rank: #22451 (+119)
Half → 25K
23:03 | 9:30/mi
30K· 18.64 mi
2:54:23
Rank: #22338 (+113)
25K → 30K
31:23 | 10:06/mi
20M
3:08:35
Rank: #22344 (-6)
30K → 20M
14:12 | 10:27/mi
21M
3:19:26
Rank: #22240 (+104)
20M → 21M
10:51 | 10:51/mi
35K· 21.75 mi
3:27:13
Rank: #22270 (-30)
21M → 35K
7:47 | 10:24/mi
23M
3:40:35
Rank: #22249 (+21)
35K → 23M
13:22 | 10:41/mi
24M
3:51:28
Rank: #22326 (-77)
23M → 24M
10:53 | 10:53/mi
40K· 24.85 mi
4:01:28
Rank: #22414 (-88)
24M → 40K
10:00 | 11:42/mi
25.2M
4:05:48
Rank: #22461 (-47)
40K → 25.2M
4:20 | 12:34/mi
Finish· 26.22 mi
4:16:23
Rank: #22517 (-56)
25.2M → Finish
10:35 | 10:23/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:59:57
Pace9:09 /mi
2nd Half
Distance13.11 mi
Time2:16:26
Pace10:24 /mi
📊Positive Split: 13.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:46:3029:449:3429:44
9:34
-
10K
6.21 mi12:14:2557:399:1727:55
8:59
-0:35
15K
9.32 mi12:42:051:25:199:0927:40
8:54
-0:05
20K
12.43 mi13:10:381:53:529:1028:33
9:11
+0:17
Half
13.11 mi13:16:431:59:579:096:05
8:55
-0:16
25K
15.53 mi13:39:462:23:009:1223:03
9:30
+0:35
30K
18.64 mi14:11:092:54:239:2131:23
10:06
+0:36
20M
20.00 mi14:25:213:08:359:2614:12
10:27
+0:21
21M
21.00 mi14:36:123:19:269:3010:51
10:51
+0:24
35K
21.75 mi14:43:593:27:139:327:47
10:24
-0:27
23M
23.00 mi14:57:213:40:359:3513:22
10:41
+0:17
24M
24.00 mi15:08:143:51:289:3910:53
10:53
+0:12
40K
24.85 mi15:18:144:01:289:4310:00
11:42
+0:49
25.2M
25.20 mi15:22:344:05:489:454:20
12:34
+0:52
Finish
26.22 mi15:33:094:16:239:4710:35
10:23
-2:11

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

8:54 /mi

Average Pace

9:47 /mi

Slowest Pace

12:34 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:23:00

56% of race

Time at Steady Pace

1:39:03

39% of race

Time at Slower Pace

14:20

6% of race

Average Pace: 9:47 /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 mi11:46:3029:449:3429:44
9:34
#24470
10K
6.21 mi12:14:2557:399:1727:55
8:59
#23470
15K
9.32 mi12:42:051:25:199:0927:40
8:54
#22919
20K
12.43 mi13:10:381:53:529:1028:33
9:11
#22635
Half
13.11 mi13:16:431:59:579:096:05
8:55
#22570
25K
15.53 mi13:39:462:23:009:1223:03
9:30
#22451
30K
18.64 mi14:11:092:54:239:2131:23
10:06
#22338
20M
20.00 mi14:25:213:08:359:2614:12
10:27
#22344
21M
21.00 mi14:36:123:19:269:3010:51
10:51
#22240
35K
21.75 mi14:43:593:27:139:327:47
10:24
#22270
23M
23.00 mi14:57:213:40:359:3513:22
10:41
#22249
24M
24.00 mi15:08:143:51:289:3910:53
10:53
#22326
40K
24.85 mi15:18:144:01:289:4310:00
11:42
#22414
25.2M
25.20 mi15:22:344:05:489:454:20
12:34
#22461
Finish
26.22 mi15:33:094:16:239:4710:35
10:23
#22517
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi24470144601446021595(Top 76%)13211(Top 82%)13211(Top 234%)
10K6.21 mi3.10 mi23470+100014002+45814002+45822328(Top 79%)13489(Top 84%)13489(Top 239%)
15K9.32 mi3.11 mi22919+55113776+22613776+22621595(Top 76%)13211(Top 82%)13211(Top 234%)
20K12.43 mi3.11 mi22635+28413649+12713649+12721844(Top 77%)13285(Top 82%)13285(Top 235%)
Half13.11 mi0.68 mi22570+6513613+3613613+3621466(Top 76%)13122(Top 81%)13122(Top 233%)
25K15.53 mi2.42 mi22451+11913552+6113552+6121883(Top 77%)13235(Top 82%)13235(Top 235%)
30K18.64 mi3.11 mi22338+11313462+9013462+9021906(Top 77%)13119(Top 81%)13119(Top 233%)
20M20.00 mi1.36 mi22344-613443+1913443+1922277(Top 78%)13173(Top 82%)13173(Top 233%)
21M21.00 mi1.00 mi22240+10413386+5713386+5720977(Top 74%)12485(Top 78%)12485(Top 221%)
35K21.75 mi0.75 mi22270-3013380+613380+622950(Top 81%)13361(Top 83%)13361(Top 237%)
23M23.00 mi1.25 mi22249+2113332+4813332+4822465(Top 79%)13088(Top 81%)13088(Top 232%)
24M24.00 mi1.00 mi22326-7713344-1213344-1223729(Top 84%)13676(Top 85%)13676(Top 242%)
40K24.85 mi0.85 mi22414-8813368-2413368-2424470(Top 86%)13999(Top 87%)13999(Top 248%)
25.2M25.20 mi0.35 mi22461-4713383-1513383-1524304(Top 86%)13918(Top 86%)13918(Top 247%)
Finish26.22 mi1.02 mi22517-5613387-413387-423993(Top 84%)13761(Top 85%)13761(Top 244%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 76%
×21stories
+97ft-345ft

Overall

21595

Males

13211

M18-39

13211

5K→10K

3.1 - 6.2 mi

Top 79%
×5stories
+79ft-138ft

Overall

22328

Males

13489

M18-39

13489

10K→15K

6.2 - 9.3 mi

Top 76%
×3stories
+67ft-78ft

Overall

21595

Males

13211

M18-39

13211

15K→20K

9.3 - 12.4 mi

Top 77%
×5stories
+106ft-86ft

Overall

21844

Males

13285

M18-39

13285

20K→Half

12.4 - 13.1 mi

Top 76%
×2stories
+19ft-37ft

Overall

21466

Males

13122

M18-39

13122

Half→25K

13.1 - 15.5 mi

Top 77%
×4stories
+66ft-88ft

Overall

21883

Males

13235

M18-39

13235

25K→30K

15.5 - 18.6 mi

Top 77%
×9stories
+181ft-148ft

Overall

21906

Males

13119

M18-39

13119

30K→20M

18.6 - 20.0 mi

Top 78%
×5stories
+64ft-50ft

Overall

22277

Males

13173

M18-39

13173

20M→21M

20.0 - 21.0 mi

Top 74%
×8stories
+106ft-24ft

Overall

20977

Males

12485

M18-39

12485

21M→35K

21.0 - 21.8 mi

Top 81%
×7stories
+17ft-86ft

Overall

22950

Males

13361

M18-39

13361

35K→23M

21.8 - 23.0 mi

Top 79%
×5stories
+23ft-63ft

Overall

22465

Males

13088

M18-39

13088

23M→24M

23.0 - 24.0 mi

Top 84%
×6stories
+12ft-82ft

Overall

23729

Males

13676

M18-39

13676

24M→40K

24.0 - 24.9 mi

Top 86%
×1story
+6ft-20ft

Overall

24470

Males

13999

M18-39

13999

40K→25.2M

24.9 - 25.2 mi

Top 86%
×1story
+13ft-16ft

Overall

24304

Males

13918

M18-39

13918

25.2M→Finish

25.2 - 26.2 mi

Top 84%
×2stories
+22ft-21ft

Overall

23993

Males

13761

M18-39

13761

Passing Analysis

Category:
Athletes Passed
2840
Passed By
887
Net Change
+1953
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#24470
5K → 10K101818+1000#24470#23470
10K → 15K56514+551#23470#22919
15K → 20K34359+284#22919#22635
20K → Half738+65#22635#22570
Half → 25K20182+119#22570#22451
25K → 30K231118+113#22451#22338
30K → 20M6773-6#22338#22344
20M → 21M13531+104#22344#22240
21M → 35K2858-30#22240#22270
35K → 23M8867+21#22270#22249
23M → 24M35112-77#22249#22326
24M → 40K22110-88#22326#22414
40K → 25.2M249-47#22414#22461
25.2M → Finish3288-56#22461#22517
TOTALS2840887+1953
📊

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