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BOSTON MARATHON 2025

Spencer Flynn

Bib: 3311•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
20:30
Rank: #4598
Start → 5K
20:30 | 6:36/mi
10K· 6.21 mi
41:30
Rank: #5186 (-588)
5K → 10K
21:00 | 6:46/mi
15K· 9.32 mi
1:02:48
Rank: #5606 (-420)
10K → 15K
21:18 | 6:51/mi
20K· 12.43 mi
1:24:53
Rank: #6231 (-625)
15K → 20K
22:05 | 7:06/mi
Half· 13.11 mi
1:29:36
Rank: #6279 (-48)
20K → Half
4:43 | 6:55/mi
25K· 15.53 mi
1:50:09
Rank: #7866 (-1587)
Half → 25K
20:33 | 8:29/mi
30K· 18.64 mi
2:22:06
Rank: #11623 (-3757)
25K → 30K
31:57 | 10:17/mi
20M
2:36:35
Rank: #12973 (-1350)
30K → 20M
14:29 | 10:39/mi
21M
2:47:39
Rank: #13729 (-756)
20M → 21M
11:04 | 11:04/mi
35K· 21.75 mi
2:56:55
Rank: #14819 (-1090)
21M → 35K
9:16 | 12:23/mi
23M
3:12:56
Rank: #16253 (-1434)
35K → 23M
16:01 | 12:48/mi
24M
3:26:27
Rank: #17552 (-1299)
23M → 24M
13:31 | 13:31/mi
40K· 24.85 mi
3:38:29
Rank: #18545 (-993)
24M → 40K
12:02 | 14:04/mi
25.2M
3:42:55
Rank: #18759 (-214)
40K → 25.2M
4:26 | 12:51/mi
Finish· 26.22 mi
3:52:59
Rank: #18948 (-189)
25.2M → Finish
10:04 | 9:53/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:29:36
Pace6:50 /mi
2nd Half
Distance13.11 mi
Time2:23:23
Pace10:56 /mi
📊Positive Split: 60.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:21:5920:306:3620:30
6:36
-
10K
6.21 mi10:42:5941:306:4121:00
6:46
+0:10
15K
9.32 mi11:04:171:02:486:4421:18
6:51
+0:05
20K
12.43 mi11:26:221:24:536:5022:05
7:06
+0:15
Half
13.11 mi11:31:051:29:366:504:43
6:55
-0:11
25K
15.53 mi11:51:381:50:097:0520:33
8:29
+1:34
30K
18.64 mi12:23:352:22:067:3731:57
10:17
+1:48
20M
20.00 mi12:38:042:36:357:5014:29
10:39
+0:22
21M
21.00 mi12:49:082:47:397:5911:04
11:04
+0:25
35K
21.75 mi12:58:242:56:558:089:16
12:23
+1:19
23M
23.00 mi13:14:253:12:568:2316:01
12:48
+0:25
24M
24.00 mi13:27:563:26:278:3613:31
13:31
+0:43
40K
24.85 mi13:39:583:38:298:4712:02
14:04
+0:33
25.2M
25.20 mi13:44:243:42:558:514:26
12:51
-1:13
Finish
26.22 mi13:54:283:52:598:5410:04
9:53
-2:58

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

6:36 /mi

Average Pace

8:54 /mi

Slowest Pace

14:04 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:50:09

47% of race

Time at Steady Pace

1:07:34

29% of race

Time at Slower Pace

55:16

24% of race

Average Pace: 8:53 /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 mi10:21:5920:306:3620:30
6:36
#4598
10K
6.21 mi10:42:5941:306:4121:00
6:46
#5186
15K
9.32 mi11:04:171:02:486:4421:18
6:51
#5606
20K
12.43 mi11:26:221:24:536:5022:05
7:06
#6231
Half
13.11 mi11:31:051:29:366:504:43
6:55
#6279
25K
15.53 mi11:51:381:50:097:0520:33
8:29
#7866
30K
18.64 mi12:23:352:22:067:3731:57
10:17
#11623
20M
20.00 mi12:38:042:36:357:5014:29
10:39
#12973
21M
21.00 mi12:49:082:47:397:5911:04
11:04
#13729
35K
21.75 mi12:58:242:56:558:089:16
12:23
#14819
23M
23.00 mi13:14:253:12:568:2316:01
12:48
#16253
24M
24.00 mi13:27:563:26:278:3613:31
13:31
#17552
40K
24.85 mi13:39:583:38:298:4712:02
14:04
#18545
25.2M
25.20 mi13:44:243:42:558:514:26
12:51
#18759
Finish
26.22 mi13:54:283:52:598:5410:04
9:53
#18948
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi4598432143216657(Top 23%)5995(Top 37%)5995(Top 106%)
10K6.21 mi3.10 mi5186-5884826-5054826-5055976(Top 21%)5470(Top 34%)5470(Top 97%)
15K9.32 mi3.11 mi5606-4205170-3445170-3446657(Top 23%)5995(Top 37%)5995(Top 106%)
20K12.43 mi3.11 mi6231-6255667-4975667-4977571(Top 27%)6599(Top 41%)6599(Top 117%)
Half13.11 mi0.68 mi6279-485699-325699-327037(Top 25%)6257(Top 39%)6257(Top 111%)
25K15.53 mi2.42 mi7866-15876850-11516850-115117026(Top 60%)11117(Top 69%)11117(Top 197%)
30K18.64 mi3.11 mi11623-37578802-19528802-195222394(Top 79%)13339(Top 83%)13339(Top 236%)
20M20.00 mi1.36 mi12973-13509380-5789380-57822837(Top 80%)13439(Top 83%)13439(Top 238%)
21M21.00 mi1.00 mi13729-7569673-2939673-29321568(Top 76%)12762(Top 79%)12762(Top 226%)
35K21.75 mi0.75 mi14819-109010143-47010143-47026339(Top 93%)15008(Top 93%)15008(Top 266%)
23M23.00 mi1.25 mi16253-143410716-57310716-57326138(Top 92%)14909(Top 93%)14909(Top 264%)
24M24.00 mi1.00 mi17552-129911222-50611222-50627331(Top 96%)15448(Top 96%)15448(Top 274%)
40K24.85 mi0.85 mi18545-99311648-42611648-42627230(Top 96%)15404(Top 96%)15404(Top 273%)
25.2M25.20 mi0.35 mi18759-21411732-8411732-8424807(Top 87%)14156(Top 88%)14156(Top 251%)
Finish26.22 mi1.02 mi18948-18911795-6311795-6322540(Top 79%)13044(Top 81%)13044(Top 231%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 23%
×21stories
+97ft-345ft

Overall

6657

Males

5995

M18-39

5995

5K→10K

3.1 - 6.2 mi

Top 21%
×5stories
+79ft-138ft

Overall

5976

Males

5470

M18-39

5470

10K→15K

6.2 - 9.3 mi

Top 23%
×3stories
+67ft-78ft

Overall

6657

Males

5995

M18-39

5995

15K→20K

9.3 - 12.4 mi

Top 27%
×5stories
+106ft-86ft

Overall

7571

Males

6599

M18-39

6599

20K→Half

12.4 - 13.1 mi

Top 25%
×2stories
+19ft-37ft

Overall

7037

Males

6257

M18-39

6257

Half→25K

13.1 - 15.5 mi

Top 60%
×4stories
+66ft-88ft

Overall

17026

Males

11117

M18-39

11117

25K→30K

15.5 - 18.6 mi

Top 79%
×9stories
+181ft-148ft

Overall

22394

Males

13339

M18-39

13339

30K→20M

18.6 - 20.0 mi

Top 80%
×5stories
+64ft-50ft

Overall

22837

Males

13439

M18-39

13439

20M→21M

20.0 - 21.0 mi

Top 76%
×8stories
+106ft-24ft

Overall

21568

Males

12762

M18-39

12762

21M→35K

21.0 - 21.8 mi

Top 93%
×7stories
+17ft-86ft

Overall

26339

Males

15008

M18-39

15008

35K→23M

21.8 - 23.0 mi

Top 92%
×5stories
+23ft-63ft

Overall

26138

Males

14909

M18-39

14909

23M→24M

23.0 - 24.0 mi

Top 96%
×6stories
+12ft-82ft

Overall

27331

Males

15448

M18-39

15448

24M→40K

24.0 - 24.9 mi

Top 96%
×1story
+6ft-20ft

Overall

27230

Males

15404

M18-39

15404

40K→25.2M

24.9 - 25.2 mi

Top 87%
×1story
+13ft-16ft

Overall

24807

Males

14156

M18-39

14156

25.2M→Finish

25.2 - 26.2 mi

Top 79%
×2stories
+22ft-21ft

Overall

22540

Males

13044

M18-39

13044

Passing Analysis

Category:
Athletes Passed
186
Passed By
14534
Net Change
-14350
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4598
5K → 10K37625-588#4598#5186
10K → 15K33453-420#5186#5606
15K → 20K35660-625#5606#6231
20K → Half1058-48#6231#6279
Half → 25K31590-1587#6279#7866
25K → 30K23757-3757#7866#11623
30K → 20M101360-1350#11623#12973
20M → 21M16772-756#12973#13729
21M → 35K11091-1090#13729#14819
35K → 23M111445-1434#14819#16253
23M → 24M31302-1299#16253#17552
24M → 40K2995-993#17552#18545
40K → 25.2M6220-214#18545#18759
25.2M → Finish17206-189#18759#18948
TOTALS18614534-14350
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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