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BOSTON MARATHON 2023

David Cai

Bib: 430•M

PA

0:00
0:00
/ mi
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Overall
#0 / 26622
Top 0.8%
Gender (Male)
#0 / 15176
Top 1%
Division (M18-39)
#0 / 5285
Top 3%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
17:45
Rank: #280
Start → 5K
17:45 | 5:43/mi
10K· 6.21 mi
35:27
Rank: #307 (-27)
5K → 10K
17:42 | 5:42/mi
15K· 9.32 mi
53:16
Rank: #304 (+3)
10K → 15K
17:49 | 5:44/mi
20K· 12.43 mi
1:11:12
Rank: #292 (+12)
15K → 20K
17:56 | 5:46/mi
Half· 13.11 mi
1:15:05
Rank: #289 (+3)
20K → Half
3:53 | 5:42/mi
25K· 15.53 mi
1:29:07
Rank: #286 (+3)
Half → 25K
14:02 | 5:47/mi
30K· 18.64 mi
1:47:22
Rank: #269 (+17)
25K → 30K
18:15 | 5:52/mi
20M
1:55:19
Rank: #256 (+13)
30K → 20M
7:57 | 5:51/mi
21M
2:01:23
Rank: #240 (+16)
20M → 21M
6:04 | 6:04/mi
35K· 21.75 mi
2:05:34
Rank: #229 (+11)
21M → 35K
4:11 | 5:36/mi
23M
2:12:49
Rank: #218 (+11)
35K → 23M
7:15 | 5:47/mi
24M
2:18:41
Rank: #220 (-2)
23M → 24M
5:52 | 5:52/mi
40K· 24.85 mi
2:23:47
Rank: #213 (+7)
24M → 40K
5:06 | 5:58/mi
25.2M
2:25:59
Rank: #210 (+3)
40K → 25.2M
2:12 | 6:23/mi
Finish· 26.22 mi
2:31:45
Rank: #200 (+10)
25.2M → Finish
5:46 | 5:40/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:15:05
Pace5:44 /mi
2nd Half
Distance13.11 mi
Time1:16:40
Pace5:51 /mi
📊Positive Split: 2.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:17:4917:455:4317:45
5:43
-
10K
6.21 mi10:35:3135:275:4217:42
5:42
-0:01
15K
9.32 mi10:53:2053:165:4317:49
5:44
+0:02
20K
12.43 mi11:11:161:11:125:4417:56
5:46
+0:02
Half
13.11 mi11:15:091:15:055:443:53
5:42
-0:04
25K
15.53 mi11:29:111:29:075:4414:02
5:47
+0:05
30K
18.64 mi11:47:261:47:225:4618:15
5:52
+0:05
20M
20.00 mi11:55:231:55:195:467:57
5:51
-0:01
21M
21.00 mi12:01:272:01:235:476:04
6:04
+0:13
35K
21.75 mi12:05:382:05:345:464:11
5:36
-0:28
23M
23.00 mi12:12:532:12:495:467:15
5:47
+0:11
24M
24.00 mi12:18:452:18:415:475:52
5:52
+0:05
40K
24.85 mi12:23:512:23:475:475:06
5:58
+0:06
25.2M
25.20 mi12:26:032:25:595:482:12
6:23
+0:25
Finish
26.22 mi12:31:492:31:455:485:46
5:40
-0:43

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

5:36 /mi

Average Pace

5:48 /mi

Slowest Pace

6:23 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:29:33

99% of race

Time at Steady Pace

2:12

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 5:47 /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 mi10:17:4917:455:4317:45
5:43
#280
10K
6.21 mi10:35:3135:275:4217:42
5:42
#307
15K
9.32 mi10:53:2053:165:4317:49
5:44
#304
20K
12.43 mi11:11:161:11:125:4417:56
5:46
#292
Half
13.11 mi11:15:091:15:055:443:53
5:42
#289
25K
15.53 mi11:29:111:29:075:4414:02
5:47
#286
30K
18.64 mi11:47:261:47:225:4618:15
5:52
#269
20M
20.00 mi11:55:231:55:195:467:57
5:51
#256
21M
21.00 mi12:01:272:01:235:476:04
6:04
#240
35K
21.75 mi12:05:382:05:345:464:11
5:36
#229
23M
23.00 mi12:12:532:12:495:467:15
5:47
#218
24M
24.00 mi12:18:452:18:415:475:52
5:52
#220
40K
24.85 mi12:23:512:23:475:475:06
5:58
#213
25.2M
25.20 mi12:26:032:25:595:482:12
6:23
#210
Finish
26.22 mi12:31:492:31:455:485:46
5:40
#200
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi280280280289(Top 1%)257(Top 2%)257(Top 5%)
10K6.21 mi3.10 mi307-27277+3277+3298(Top 1%)265(Top 2%)265(Top 5%)
15K9.32 mi3.11 mi304+3273+4273+4289(Top 1%)257(Top 2%)257(Top 5%)
20K12.43 mi3.11 mi292+12264+9264+9262(Top 1.0%)234(Top 2%)234(Top 4%)
Half13.11 mi0.68 mi289+3261+3261+3262(Top 1.0%)240(Top 2%)240(Top 5%)
25K15.53 mi2.42 mi286+3258+3258+3256(Top 1.0%)230(Top 2%)230(Top 4%)
30K18.64 mi3.11 mi269+17241+17241+17217(Top 0.8%)194(Top 1%)194(Top 4%)
20M20.00 mi1.36 mi256+13231+10231+10199(Top 0.7%)177(Top 1%)177(Top 3%)
21M21.00 mi1.00 mi240+16214+17214+17145(Top 0.5%)125(Top 0.8%)125(Top 2%)
35K21.75 mi0.75 mi229+11204+10204+10146(Top 0.5%)124(Top 0.8%)124(Top 2%)
23M23.00 mi1.25 mi218+11194+10194+10129(Top 0.5%)110(Top 0.7%)110(Top 2%)
24M24.00 mi1.00 mi220-2195-1195-1327(Top 1%)301(Top 2%)301(Top 6%)
40K24.85 mi0.85 mi213+7188+7188+7291(Top 1%)268(Top 2%)268(Top 5%)
25.2M25.20 mi0.35 mi210+3185+3185+3299(Top 1%)278(Top 2%)278(Top 5%)
Finish26.22 mi1.02 mi200+10175+10175+10192(Top 0.7%)176(Top 1%)176(Top 3%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 1%
×21stories
+97ft-345ft

Overall

289

Males

257

M18-39

257

5K→10K

3.1 - 6.2 mi

Top 1%
×5stories
+79ft-138ft

Overall

298

Males

265

M18-39

265

10K→15K

6.2 - 9.3 mi

Top 1%
×3stories
+67ft-78ft

Overall

289

Males

257

M18-39

257

15K→20K

9.3 - 12.4 mi

Top 1.0%
×5stories
+106ft-86ft

Overall

262

Males

234

M18-39

234

20K→Half

12.4 - 13.1 mi

Top 1.0%
×2stories
+19ft-37ft

Overall

262

Males

240

M18-39

240

Half→25K

13.1 - 15.5 mi

Top 1.0%
×4stories
+66ft-88ft

Overall

256

Males

230

M18-39

230

25K→30K

15.5 - 18.6 mi

Top 0.8%
×9stories
+181ft-148ft

Overall

217

Males

194

M18-39

194

30K→20M

18.6 - 20.0 mi

Top 0.7%
×5stories
+64ft-50ft

Overall

199

Males

177

M18-39

177

20M→21M

20.0 - 21.0 mi

Top 0.5%
×8stories
+106ft-24ft

Overall

145

Males

125

M18-39

125

21M→35K

21.0 - 21.8 mi

Top 0.5%
×7stories
+17ft-86ft

Overall

146

Males

124

M18-39

124

35K→23M

21.8 - 23.0 mi

Top 0.5%
×5stories
+23ft-63ft

Overall

129

Males

110

M18-39

110

23M→24M

23.0 - 24.0 mi

Top 1%
×6stories
+12ft-82ft

Overall

327

Males

301

M18-39

301

24M→40K

24.0 - 24.9 mi

Top 1%
×1story
+6ft-20ft

Overall

291

Males

268

M18-39

268

40K→25.2M

24.9 - 25.2 mi

Top 1%
×1story
+13ft-16ft

Overall

299

Males

278

M18-39

278

25.2M→Finish

25.2 - 26.2 mi

Top 0.7%
×2stories
+22ft-21ft

Overall

192

Males

176

M18-39

176

Passing Analysis

Category:
Athletes Passed
153
Passed By
73
Net Change
+80
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#280
5K → 10K1542-27#280#307
10K → 15K107+3#307#304
15K → 20K164+12#304#292
20K → Half30+3#292#289
Half → 25K96+3#289#286
25K → 30K214+17#286#269
30K → 20M130+13#269#256
20M → 21M171+16#256#240
21M → 35K110+11#240#229
35K → 23M143+11#229#218
23M → 24M24-2#218#220
24M → 40K70+7#220#213
40K → 25.2M41+3#213#210
25.2M → Finish111+10#210#200
TOTALS15373+80
📊

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