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BOSTON MARATHON 2023

Jeremy Lai

Bib: 5555•M

TX

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 14%
Gender (Male)
#0 / 15176
Top 23%
Masters (Masters Men)
#0 / 9891
Top 10%
Division (M40-44)
#0 / 2241
Top 25%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
21:15
Rank: #5039
Start → 5K
21:15 | 6:50/mi
10K· 6.21 mi
42:02
Rank: #4636 (+403)
5K → 10K
20:47 | 6:41/mi
15K· 9.32 mi
1:02:58
Rank: #4559 (+77)
10K → 15K
20:56 | 6:44/mi
20K· 12.43 mi
1:23:59
Rank: #4419 (+140)
15K → 20K
21:01 | 6:46/mi
Half· 13.11 mi
1:28:33
Rank: #4408 (+11)
20K → Half
4:34 | 6:42/mi
25K· 15.53 mi
1:44:53
Rank: #4235 (+173)
Half → 25K
16:20 | 6:44/mi
30K· 18.64 mi
2:06:12
Rank: #4039 (+196)
25K → 30K
21:19 | 6:52/mi
20M
2:15:31
Rank: #3933 (+106)
30K → 20M
9:19 | 6:51/mi
21M
2:22:39
Rank: #3793 (+140)
20M → 21M
7:08 | 7:08/mi
35K· 21.75 mi
2:27:39
Rank: #3778 (+15)
21M → 35K
5:00 | 6:41/mi
23M
2:36:22
Rank: #3738 (+40)
35K → 23M
8:43 | 6:58/mi
24M
2:43:03
Rank: #3662 (+76)
23M → 24M
6:41 | 6:41/mi
40K· 24.85 mi
2:48:53
Rank: #3603 (+59)
24M → 40K
5:50 | 6:49/mi
25.2M
2:51:25
Rank: #3587 (+16)
40K → 25.2M
2:32 | 7:21/mi
Finish· 26.22 mi
2:58:28
Rank: #3642 (-55)
25.2M → Finish
7:03 | 6:55/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:28:33
Pace6:45 /mi
2nd Half
Distance13.11 mi
Time1:29:55
Pace6:52 /mi
📊Positive Split: 1.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:23:4721:156:5021:15
6:50
-
10K
6.21 mi10:44:3442:026:4620:47
6:41
-0:09
15K
9.32 mi11:05:301:02:586:4520:56
6:44
+0:03
20K
12.43 mi11:26:311:23:596:4521:01
6:46
+0:02
Half
13.11 mi11:31:051:28:336:454:34
6:42
-0:04
25K
15.53 mi11:47:251:44:536:4516:20
6:44
+0:02
30K
18.64 mi12:08:442:06:126:4621:19
6:52
+0:08
20M
20.00 mi12:18:032:15:316:479:19
6:51
-0:01
21M
21.00 mi12:25:112:22:396:487:08
7:08
+0:17
35K
21.75 mi12:30:112:27:396:475:00
6:41
-0:27
23M
23.00 mi12:38:542:36:226:488:43
6:58
+0:17
24M
24.00 mi12:45:352:43:036:486:41
6:41
-0:17
40K
24.85 mi12:51:252:48:536:485:50
6:49
+0:08
25.2M
25.20 mi12:53:572:51:256:482:32
7:21
+0:32
Finish
26.22 mi13:01:002:58:286:497:03
6:55
-0:26

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

6:41 /mi

Average Pace

6:49 /mi

Slowest Pace

7:21 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:48:48

95% of race

Time at Steady Pace

9:40

5% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:48 /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 mi10:23:4721:156:5021:15
6:50
#5039
10K
6.21 mi10:44:3442:026:4620:47
6:41
#4636
15K
9.32 mi11:05:301:02:586:4520:56
6:44
#4559
20K
12.43 mi11:26:311:23:596:4521:01
6:46
#4419
Half
13.11 mi11:31:051:28:336:454:34
6:42
#4408
25K
15.53 mi11:47:251:44:536:4516:20
6:44
#4235
30K
18.64 mi12:08:442:06:126:4621:19
6:52
#4039
20M
20.00 mi12:18:032:15:316:479:19
6:51
#3933
21M
21.00 mi12:25:112:22:396:487:08
7:08
#3793
35K
21.75 mi12:30:112:27:396:475:00
6:41
#3778
23M
23.00 mi12:38:542:36:226:488:43
6:58
#3738
24M
24.00 mi12:45:352:43:036:486:41
6:41
#3662
40K
24.85 mi12:51:252:48:536:485:50
6:49
#3603
25.2M
25.20 mi12:53:572:51:256:482:32
7:21
#3587
Finish
26.22 mi13:01:002:58:286:497:03
6:55
#3642
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi5039467446744480(Top 17%)4184(Top 28%)4184(Top 187%)
10K6.21 mi3.10 mi4636+4034324+3504324+3504227(Top 16%)3960(Top 26%)3960(Top 177%)
15K9.32 mi3.11 mi4559+774258+664258+664480(Top 17%)4184(Top 28%)4184(Top 187%)
20K12.43 mi3.11 mi4419+1404133+1254133+1254118(Top 15%)3862(Top 25%)3862(Top 172%)
Half13.11 mi0.68 mi4408+114125+84125+84222(Top 16%)3946(Top 26%)3946(Top 176%)
25K15.53 mi2.42 mi4235+1733971+1543971+1543648(Top 14%)3437(Top 23%)3437(Top 153%)
30K18.64 mi3.11 mi4039+1963798+1733798+1733387(Top 13%)3187(Top 21%)3187(Top 142%)
20M20.00 mi1.36 mi3933+1063701+973701+973168(Top 12%)2974(Top 20%)2974(Top 133%)
21M21.00 mi1.00 mi3793+1403572+1293572+1292779(Top 10%)2613(Top 17%)2613(Top 117%)
35K21.75 mi0.75 mi3778+153560+123560+123463(Top 13%)3215(Top 21%)3215(Top 143%)
23M23.00 mi1.25 mi3738+403522+383522+383578(Top 13%)3317(Top 22%)3317(Top 148%)
24M24.00 mi1.00 mi3662+763453+693453+693024(Top 11%)2808(Top 19%)2808(Top 125%)
40K24.85 mi0.85 mi3603+593395+583395+582950(Top 11%)2717(Top 18%)2717(Top 121%)
25.2M25.20 mi0.35 mi3587+163380+153380+153154(Top 12%)2877(Top 19%)2877(Top 128%)
Finish26.22 mi1.02 mi3642-553427-473427-474716(Top 18%)4071(Top 27%)4071(Top 182%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 17%
×21stories
+97ft-345ft

Overall

4480

Males

4184

M40-44

4184

5K→10K

3.1 - 6.2 mi

Top 16%
×5stories
+79ft-138ft

Overall

4227

Males

3960

M40-44

3960

10K→15K

6.2 - 9.3 mi

Top 17%
×3stories
+67ft-78ft

Overall

4480

Males

4184

M40-44

4184

15K→20K

9.3 - 12.4 mi

Top 15%
×5stories
+106ft-86ft

Overall

4118

Males

3862

M40-44

3862

20K→Half

12.4 - 13.1 mi

Top 16%
×2stories
+19ft-37ft

Overall

4222

Males

3946

M40-44

3946

Half→25K

13.1 - 15.5 mi

Top 14%
×4stories
+66ft-88ft

Overall

3648

Males

3437

M40-44

3437

25K→30K

15.5 - 18.6 mi

Top 13%
×9stories
+181ft-148ft

Overall

3387

Males

3187

M40-44

3187

30K→20M

18.6 - 20.0 mi

Top 12%
×5stories
+64ft-50ft

Overall

3168

Males

2974

M40-44

2974

20M→21M

20.0 - 21.0 mi

Top 10%
×8stories
+106ft-24ft

Overall

2779

Males

2613

M40-44

2613

21M→35K

21.0 - 21.8 mi

Top 13%
×7stories
+17ft-86ft

Overall

3463

Males

3215

M40-44

3215

35K→23M

21.8 - 23.0 mi

Top 13%
×5stories
+23ft-63ft

Overall

3578

Males

3317

M40-44

3317

23M→24M

23.0 - 24.0 mi

Top 11%
×6stories
+12ft-82ft

Overall

3024

Males

2808

M40-44

2808

24M→40K

24.0 - 24.9 mi

Top 11%
×1story
+6ft-20ft

Overall

2950

Males

2717

M40-44

2717

40K→25.2M

24.9 - 25.2 mi

Top 12%
×1story
+13ft-16ft

Overall

3154

Males

2877

M40-44

2877

25.2M→Finish

25.2 - 26.2 mi

Top 18%
×2stories
+22ft-21ft

Overall

4716

Males

4071

M40-44

4071

Passing Analysis

Category:
Athletes Passed
1862
Passed By
465
Net Change
+1397
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#5039
5K → 10K46259+403#5039#4636
10K → 15K15881+77#4636#4559
15K → 20K18040+140#4559#4419
20K → Half2413+11#4419#4408
Half → 25K19421+173#4408#4235
25K → 30K22933+196#4235#4039
30K → 20M12115+106#4039#3933
20M → 21M1499+140#3933#3793
21M → 35K3217+15#3793#3778
35K → 23M8343+40#3778#3738
23M → 24M9317+76#3738#3662
24M → 40K7516+59#3662#3603
40K → 25.2M2610+16#3603#3587
25.2M → Finish3691-55#3587#3642
TOTALS1862465+1397
📊

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