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BOSTON MARATHON 2025

Jiang Shu

Bib: 28621•M

NC

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M45-49)
#0 / 2386
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
29:04
Rank: #23752
Start → 5K
9:21/mi
29:04 split
10K· 6.21 mi
54:51
Rank: #21586 (+2166)
5K → 10K
8:18/mi
25:47 split
15K· 9.32 mi
1:20:16
Rank: #20269 (+1317)
10K → 15K
8:11/mi
25:25 split
20K· 12.43 mi
1:46:18
Rank: #19613 (+656)
15K → 20K
8:23/mi
26:02 split
Half· 13.11 mi
1:51:56
Rank: #19509 (+104)
20K → Half
8:15/mi
5:38 split
25K· 15.53 mi
2:12:37
Rank: #19143 (+366)
Half → 25K
8:32/mi
20:41 split
30K· 18.64 mi
2:40:51
Rank: #18912 (+231)
25K → 30K
9:05/mi
28:14 split
20M
2:53:38
Rank: #18913 (-1)
30K → 20M
9:24/mi
12:47 split
21M
3:03:45
Rank: #18908 (+5)
20M → 21M
10:07/mi
10:07 split
35K· 21.75 mi
3:10:52
Rank: #18976 (-68)
21M → 35K
9:31/mi
7:07 split
23M
3:23:42
Rank: #19184 (-208)
35K → 23M
10:15/mi
12:50 split
24M
3:37:26
Rank: #20094 (-910)
23M → 24M
13:44/mi
13:44 split
40K· 24.85 mi
3:59:53
Rank: #22248 (-2154)
24M → 40K
26:15/mi
22:27 split
25.2M
4:05:43
Rank: #22451 (-203)
40K → 25.2M
16:55/mi
5:50 split
Finish· 26.22 mi
4:21:14
Rank: #23086 (-635)
25.2M → Finish
15:14/mi
15:31 split

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:51:56
Pace8:32 /mi
2nd Half
Distance13.11 mi
Time2:29:18
Pace11:23 /mi
📊Positive Split: 33.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:46:1029:049:2129:04
9:21
-
10K
6.21 mi12:11:5754:518:5025:47
8:18
-1:03
15K
9.32 mi12:37:221:20:168:3725:25
8:11
-0:07
20K
12.43 mi13:03:241:46:188:3326:02
8:23
+0:12
Half
13.11 mi13:09:021:51:568:325:38
8:15
-0:08
25K
15.53 mi13:29:432:12:378:3220:41
8:32
+0:17
30K
18.64 mi13:57:572:40:518:3828:14
9:05
+0:33
20M
20.00 mi14:10:442:53:388:4112:47
9:24
+0:19
21M
21.00 mi14:20:513:03:458:4510:07
10:07
+0:43
35K
21.75 mi14:27:583:10:528:477:07
9:31
-0:36
23M
23.00 mi14:40:483:23:428:5112:50
10:15
+0:44
24M
24.00 mi14:54:323:37:269:0413:44
13:44
+3:29
40K
24.85 mi15:16:593:59:539:3922:27
26:15
+12:31
25.2M
25.20 mi15:22:494:05:439:455:50
16:55
-9:20
Finish
26.22 mi15:38:204:21:149:5815:31
15:14
-1:41

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

8:11 /mi

Average Pace

9:58 /mi

Slowest Pace

26:15 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

0:00

0% of race

Time at Steady Pace

3:23:42

78% of race

Time at Slower Pace

57:32

22% of race

Average Pace: 9:58 /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 mi11:46:1029:049:2129:04
9:21
#23752
10K
6.21 mi12:11:5754:518:5025:47
8:18
#21586
15K
9.32 mi12:37:221:20:168:3725:25
8:11
#20269
20K
12.43 mi13:03:241:46:188:3326:02
8:23
#19613
Half
13.11 mi13:09:021:51:568:325:38
8:15
#19509
25K
15.53 mi13:29:432:12:378:3220:41
8:32
#19143
30K
18.64 mi13:57:572:40:518:3828:14
9:05
#18912
20M
20.00 mi14:10:442:53:388:4112:47
9:24
#18913
21M
21.00 mi14:20:513:03:458:4510:07
10:07
#18908
35K
21.75 mi14:27:583:10:528:477:07
9:31
#18976
23M
23.00 mi14:40:483:23:428:5112:50
10:15
#19184
24M
24.00 mi14:54:323:37:269:0413:44
13:44
#20094
40K
24.85 mi15:16:593:59:539:3922:27
26:15
#22248
25.2M
25.20 mi15:22:494:05:439:455:50
16:55
#22451
Finish
26.22 mi15:38:204:21:149:5815:31
15:14
#23086
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi23752141301413017272(Top 61%)11341(Top 70%)11341(Top 475%)
10K6.21 mi3.10 mi21586+216613146+98413146+98418547(Top 65%)11875(Top 74%)11875(Top 498%)
15K9.32 mi3.11 mi20269+131712589+55712589+55717272(Top 61%)11341(Top 70%)11341(Top 475%)
20K12.43 mi3.11 mi19613+65612306+28312306+28317433(Top 61%)11369(Top 71%)11369(Top 476%)
Half13.11 mi0.68 mi19509+10412256+5012256+5017651(Top 62%)11493(Top 71%)11493(Top 482%)
25K15.53 mi2.42 mi19143+36612096+16012096+16017373(Top 61%)11264(Top 70%)11264(Top 472%)
30K18.64 mi3.11 mi18912+23111964+13211964+13218130(Top 64%)11434(Top 71%)11434(Top 479%)
20M20.00 mi1.36 mi18913-111935+2911935+2918776(Top 66%)11583(Top 72%)11583(Top 485%)
21M21.00 mi1.00 mi18908+511901+3411901+3418727(Top 66%)11491(Top 71%)11491(Top 482%)
35K21.75 mi0.75 mi18976-6811915-1411915-1420378(Top 72%)12155(Top 75%)12155(Top 509%)
23M23.00 mi1.25 mi19184-20811978-6311978-6321270(Top 75%)12529(Top 78%)12529(Top 525%)
24M24.00 mi1.00 mi20094-91012352-37412352-37427480(Top 97%)15537(Top 96%)15537(Top 651%)
40K24.85 mi0.85 mi22248-215413302-95013302-95028404(Top 100%)16105(Top 100%)16105(Top 675%)
25.2M25.20 mi0.35 mi22451-20313377-7513377-7528039(Top 99%)15843(Top 98%)15843(Top 664%)
Finish26.22 mi1.02 mi23086-63513657-28013657-28028268(Top 100%)16014(Top 99%)16014(Top 671%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 61%
×21stories
+97ft-345ft

Overall

17272

Males

11341

M45-49

11341

5K→10K

3.1 - 6.2 mi

Top 65%
×5stories
+79ft-138ft

Overall

18547

Males

11875

M45-49

11875

10K→15K

6.2 - 9.3 mi

Top 61%
×3stories
+67ft-78ft

Overall

17272

Males

11341

M45-49

11341

15K→20K

9.3 - 12.4 mi

Top 61%
×5stories
+106ft-86ft

Overall

17433

Males

11369

M45-49

11369

20K→Half

12.4 - 13.1 mi

Top 62%
×2stories
+19ft-37ft

Overall

17651

Males

11493

M45-49

11493

Half→25K

13.1 - 15.5 mi

Top 61%
×4stories
+66ft-88ft

Overall

17373

Males

11264

M45-49

11264

25K→30K

15.5 - 18.6 mi

Top 64%
×9stories
+181ft-148ft

Overall

18130

Males

11434

M45-49

11434

30K→20M

18.6 - 20.0 mi

Top 66%
×5stories
+64ft-50ft

Overall

18776

Males

11583

M45-49

11583

20M→21M

20.0 - 21.0 mi

Top 66%
×8stories
+106ft-24ft

Overall

18727

Males

11491

M45-49

11491

21M→35K

21.0 - 21.8 mi

Top 72%
×7stories
+17ft-86ft

Overall

20378

Males

12155

M45-49

12155

35K→23M

21.8 - 23.0 mi

Top 75%
×5stories
+23ft-63ft

Overall

21270

Males

12529

M45-49

12529

23M→24M

23.0 - 24.0 mi

Top 97%
×6stories
+12ft-82ft

Overall

27480

Males

15537

M45-49

15537

24M→40K

24.0 - 24.9 mi

Top 100%
×1story
+6ft-20ft

Overall

28404

Males

16105

M45-49

16105

40K→25.2M

24.9 - 25.2 mi

Top 99%
×1story
+13ft-16ft

Overall

28039

Males

15843

M45-49

15843

25.2M→Finish

25.2 - 26.2 mi

Top 100%
×2stories
+22ft-21ft

Overall

28268

Males

16014

M45-49

16014

Passing Analysis

Category:
Athletes Passed
5279
Passed By
4613
Net Change
+666
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23752
5K → 10K21660+2166#23752#21586
10K → 15K13170+1317#21586#20269
15K → 20K6615+656#20269#19613
20K → Half1139+104#19613#19509
Half → 25K39024+366#19509#19143
25K → 30K32998+231#19143#18912
30K → 20M111112-1#18912#18913
20M → 21M109104+5#18913#18908
21M → 35K39107-68#18908#18976
35K → 23M39247-208#18976#19184
23M → 24M3913-910#19184#20094
24M → 40K02154-2154#20094#22248
40K → 25.2M0203-203#22248#22451
25.2M → Finish2637-635#22451#23086
TOTALS52794613+666
📊

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