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BOSTON MARATHON 2023

Jeremy Chan

Bib: 29758 M SG

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M40-44)
#0 / 2241
Race Day Weather
49°/39°F
light intensity drizzle

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
8:41/mi
26:59
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
8:48/mi
54:20
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
8:41/mi
1:21:20
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
9:13/mi
1:49:58
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
12:01/mi
1:58:10
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
9:15/mi
2:20:35
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
9:32/mi
2:50:13
↑ 181↓ 1480.2%
138 ft elev
20M
9:38/mi
3:03:18
↑ 64↓ 500.2%
148 ft elev
21M
10:40/mi
3:13:58
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
9:16/mi
3:20:54
↑ 17↓ 861.7%
156 ft elev
23M
9:38/mi
3:32:58
↑ 23↓ 630.6%
116 ft elev
24M
9:33/mi
3:42:31
↓ 821.3%
34 ft elev
40K· 24.85 mi
9:53/mi
3:50:58
↓ 200.3%
20 ft elev
25.2M
10:35/mi
3:54:37
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:59/mi
4:03:46
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:58:109:01 /mi⚡ faster
2nd Half
2:05:369:35 /mi+6.3%
Positive split — 6.3% slower in the second half
Is this your race?

Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:51:5926:598:4126:59
8:41
-
10K
6.21 mi12:19:2054:208:4527:21
8:48
+0:07
15K
9.32 mi12:46:201:21:208:4427:00
8:41
-0:07
20K
12.43 mi13:14:581:49:588:5128:38
9:13
+0:32
Half
13.11 mi13:23:101:58:109:018:12
12:01
+2:48
25K
15.53 mi13:45:352:20:359:0322:25
9:15
-2:46
30K
18.64 mi14:15:132:50:139:0829:38
9:32
+0:17
20M
20.00 mi14:28:183:03:189:1013:05
9:38
+0:06
21M
21.00 mi14:38:583:13:589:1410:40
10:40
+1:02
35K
21.75 mi14:45:543:20:549:146:56
9:16
-1:24
23M
23.00 mi14:57:583:32:589:1612:04
9:38
+0:22
24M
24.00 mi15:07:313:42:319:169:33
9:33
-0:05
40K
24.85 mi15:15:583:50:589:188:27
9:53
+0:20
25.2M
25.20 mi15:19:373:54:379:193:39
10:35
+0:42
Finish
26.22 mi15:28:464:03:469:189:09
8:59
-1:36

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

8:41 /mi

Average Pace

9:18 /mi

Slowest Pace

12:01 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Segment Time Comparison

Time at Faster Pace

1:30:29

37% of race

Time at Steady Pace

2:10:46

54% of race

Time at Slower Pace

22:31

9% of race

Average Pace: 9:18 /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 mi11:51:5926:598:4126:59
8:41
#18777
10K
6.21 mi12:19:2054:208:4527:21
8:48
#19366
15K
9.32 mi12:46:201:21:208:4427:00
8:41
#19188
20K
12.43 mi13:14:581:49:588:5128:38
9:13
#19579
Half
13.11 mi13:23:101:58:109:018:12
12:01
#20430
25K
15.53 mi13:45:352:20:359:0322:25
9:15
#20355
30K
18.64 mi14:15:132:50:139:0829:38
9:32
#20200
20M
20.00 mi14:28:183:03:189:1013:05
9:38
#20110
21M
21.00 mi14:38:583:13:589:1410:40
10:40
#20105
35K
21.75 mi14:45:543:20:549:146:56
9:16
#20057
23M
23.00 mi14:57:583:32:589:1612:04
9:38
#19978
24M
24.00 mi15:07:313:42:319:169:33
9:33
#19960
40K
24.85 mi15:15:583:50:589:188:27
9:53
#19951
25.2M
25.20 mi15:19:373:54:379:193:39
10:35
#19945
Finish
26.22 mi15:28:464:03:469:189:09
8:59
#19871
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi187771169811698189211184711847
10K6.21 mi3.10 mi19366-58911966-26811966-268199361225812258
15K9.32 mi3.11 mi19188+17811924+4211924+42189211184711847
20K12.43 mi3.11 mi19579-39112084-16012084-160206371259212592
Half13.11 mi0.68 mi20430-85112452-36812452-368258831486414864
25K15.53 mi2.42 mi20355+7512428+2412428+24200041229112291
30K18.64 mi3.11 mi20200+15512339+8912339+89195711203312033
20M20.00 mi1.36 mi20110+9012281+5812281+58193171183211832
21M21.00 mi1.00 mi20105+512274+712274+7200501207112071
35K21.75 mi0.75 mi20057+4812246+2812246+28190041159811598
23M23.00 mi1.25 mi19978+7912202+4412202+44188621151511515
24M24.00 mi1.00 mi19960+1812189+1312189+13193851171011710
40K24.85 mi0.85 mi19951+912178+1112178+11196361176311763
25.2M25.20 mi0.35 mi19945+612169+912169+9193321162311623
Finish26.22 mi1.02 mi19871+7412134+3512134+35178651100711007

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 71%
×21story building
+97ft-345ft

Overall

18921

Males

11847

M40-44

11847

5K→10K

3.1 - 6.2 mi

Top 75%
×5story building
+79ft-138ft

Overall

19936

Males

12258

M40-44

12258

10K→15K

6.2 - 9.3 mi

Top 71%
×3story building
+67ft-78ft

Overall

18921

Males

11847

M40-44

11847

15K→20K

9.3 - 12.4 mi

Top 78%
×5story building
+106ft-86ft

Overall

20637

Males

12592

M40-44

12592

20K→Half

12.4 - 13.1 mi

Top 97%
×2story building
+19ft-37ft

Overall

25883

Males

14864

M40-44

14864

Half→25K

13.1 - 15.5 mi

Top 75%
×4story building
+66ft-88ft

Overall

20004

Males

12291

M40-44

12291

25K→30K

15.5 - 18.6 mi

Top 74%
×9story building
+181ft-148ft

Overall

19571

Males

12033

M40-44

12033

30K→20M

18.6 - 20.0 mi

Top 73%
×5story building
+64ft-50ft

Overall

19317

Males

11832

M40-44

11832

20M→21M

20.0 - 21.0 mi

Top 75%
×8story building
+106ft-24ft

Overall

20050

Males

12071

M40-44

12071

21M→35K

21.0 - 21.8 mi

Top 71%
×7story building
+17ft-86ft

Overall

19004

Males

11598

M40-44

11598

35K→23M

21.8 - 23.0 mi

Top 71%
×5story building
+23ft-63ft

Overall

18862

Males

11515

M40-44

11515

23M→24M

23.0 - 24.0 mi

Top 73%
×6story building
+12ft-82ft

Overall

19385

Males

11710

M40-44

11710

24M→40K

24.0 - 24.9 mi

Top 74%
×1story
+6ft-20ft

Overall

19636

Males

11763

M40-44

11763

40K→25.2M

24.9 - 25.2 mi

Top 73%
×1story
+13ft-16ft

Overall

19332

Males

11623

M40-44

11623

25.2M→Finish

25.2 - 26.2 mi

Top 67%
×2story building
+22ft-21ft

Overall

17865

Males

11007

M40-44

11007

Passing Analysis

Category:
Athletes Passed
1471
Passed By
2565
Net Change
-1094
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18777
5K → 10K128717-589#18777#19366
10K → 15K286108+178#19366#19188
15K → 20K66457-391#19188#19579
20K → Half0851-851#19579#20430
Half → 25K15075+75#20430#20355
25K → 30K22671+155#20355#20200
30K → 20M12939+90#20200#20110
20M → 21M7671+5#20110#20105
21M → 35K6820+48#20105#20057
35K → 23M11031+79#20057#19978
23M → 24M6648+18#19978#19960
24M → 40K5445+9#19960#19951
40K → 25.2M2822+6#19951#19945
25.2M → Finish8410+74#19945#19871
TOTALS14712565-1094

Passing Charts

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