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BOSTON MARATHON 2023

Joyce Lai

CA

Bib: 18497 F

0:00
0:00
/ mi
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Top 43%
Division (F18-39)
#0 / 4884
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
8:16/mi
25:40
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
8:12/mi
51:09
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
8:08/mi
1:16:26
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
8:14/mi
1:42:00
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
8:02/mi
1:47:29
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
8:11/mi
2:07:20
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
8:32/mi
2:33:52
↑ 181↓ 1480.2%
138 ft elev
20M
8:36/mi
2:45:33
↑ 64↓ 500.2%
148 ft elev
21M
9:12/mi
2:54:45
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
8:12/mi
3:00:53
↑ 17↓ 861.7%
156 ft elev
23M
8:41/mi
3:11:45
↑ 23↓ 630.6%
116 ft elev
24M
8:32/mi
3:20:17
↓ 821.3%
34 ft elev
40K· 24.85 mi
8:50/mi
3:27:50
↓ 200.3%
20 ft elev
25.2M
9:46/mi
3:31:12
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:43/mi
3:40:05
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:47:29
Pace8:12 /mi
2nd Half
Distance13.11 mi
Time1:52:36
Pace8:35 /mi
📊Positive Split: 4.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:21:1825:408:1625:40
8:16
-
10K
6.21 mi11:46:4751:098:1425:29
8:12
-0:04
15K
9.32 mi12:12:041:16:268:1225:17
8:08
-0:04
20K
12.43 mi12:37:381:42:008:1225:34
8:14
+0:06
Half
13.11 mi12:43:071:47:298:125:29
8:02
-0:12
25K
15.53 mi13:02:582:07:208:1219:51
8:11
+0:09
30K
18.64 mi13:29:302:33:528:1526:32
8:32
+0:21
20M
20.00 mi13:41:112:45:338:1711:41
8:36
+0:04
21M
21.00 mi13:50:232:54:458:199:12
9:12
+0:36
35K
21.75 mi13:56:313:00:538:196:08
8:12
-1:00
23M
23.00 mi14:07:233:11:458:2010:52
8:41
+0:29
24M
24.00 mi14:15:553:20:178:218:32
8:32
-0:09
40K
24.85 mi14:23:283:27:508:227:33
8:50
+0:18
25.2M
25.20 mi14:26:503:31:128:233:22
9:46
+0:56
Finish
26.22 mi14:35:433:40:058:248:53
8:43
-1:03

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

8:02 /mi

Average Pace

8:24 /mi

Slowest Pace

9:46 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:13:28

61% of race

Time at Steady Pace

1:06:30

30% of race

Time at Slower Pace

20:07

9% of race

Average Pace: 8:24 /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 mi11:21:1825:408:1625:40
8:16
#15900
10K
6.21 mi11:46:4751:098:1425:29
8:12
#16058
15K
9.32 mi12:12:041:16:268:1225:17
8:08
#15830
20K
12.43 mi12:37:381:42:008:1225:34
8:14
#15631
Half
13.11 mi12:43:071:47:298:125:29
8:02
#15583
25K
15.53 mi13:02:582:07:208:1219:51
8:11
#15333
30K
18.64 mi13:29:302:33:528:1526:32
8:32
#15159
20M
20.00 mi13:41:112:45:338:1711:41
8:36
#15080
21M
21.00 mi13:50:232:54:458:199:12
9:12
#15038
35K
21.75 mi13:56:313:00:538:196:08
8:12
#14966
23M
23.00 mi14:07:233:11:458:2010:52
8:41
#14909
24M
24.00 mi14:15:553:20:178:218:32
8:32
#14879
40K
24.85 mi14:23:283:27:508:227:33
8:50
#14862
25.2M
25.20 mi14:26:503:31:128:233:22
9:46
#14882
Finish
26.22 mi14:35:433:40:058:248:53
8:43
#14975
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi159005218521815429(Top 58%)4932(Top 43%)4932(Top 101%)
10K6.21 mi3.10 mi16058-1585316-985316-9816272(Top 61%)5438(Top 48%)5438(Top 111%)
15K9.32 mi3.11 mi15830+2285171+1455171+14515429(Top 58%)4932(Top 43%)4932(Top 101%)
20K12.43 mi3.11 mi15631+1995075+965075+9615155(Top 57%)4806(Top 42%)4806(Top 98%)
Half13.11 mi0.68 mi15583+485050+255050+2514735(Top 55%)4531(Top 40%)4531(Top 93%)
25K15.53 mi2.42 mi15333+2504920+1304920+13014157(Top 53%)4319(Top 38%)4319(Top 88%)
30K18.64 mi3.11 mi15159+1744859+614859+6114560(Top 55%)4664(Top 41%)4664(Top 95%)
20M20.00 mi1.36 mi15080+794823+364823+3614275(Top 54%)4587(Top 40%)4587(Top 94%)
21M21.00 mi1.00 mi15038+424823482314502(Top 54%)4765(Top 42%)4765(Top 98%)
35K21.75 mi0.75 mi14966+724794+294794+2913489(Top 51%)4288(Top 38%)4288(Top 88%)
23M23.00 mi1.25 mi14909+574779+154779+1514274(Top 54%)4774(Top 42%)4774(Top 98%)
24M24.00 mi1.00 mi14879+304781-24781-214695(Top 55%)5063(Top 44%)5063(Top 104%)
40K24.85 mi0.85 mi14862+174800-194800-1915259(Top 57%)5441(Top 48%)5441(Top 111%)
25.2M25.20 mi0.35 mi14882-204819-194819-1916396(Top 62%)6090(Top 53%)6090(Top 125%)
Finish26.22 mi1.02 mi14975-934897-784897-7816582(Top 62%)6136(Top 54%)6136(Top 126%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 58%
×21story building
+97ft-345ft

Overall

15429

Females

4932

F18-39

4932

5K→10K

3.1 - 6.2 mi

Top 61%
×5story building
+79ft-138ft

Overall

16272

Females

5438

F18-39

5438

10K→15K

6.2 - 9.3 mi

Top 58%
×3story building
+67ft-78ft

Overall

15429

Females

4932

F18-39

4932

15K→20K

9.3 - 12.4 mi

Top 57%
×5story building
+106ft-86ft

Overall

15155

Females

4806

F18-39

4806

20K→Half

12.4 - 13.1 mi

Top 55%
×2story building
+19ft-37ft

Overall

14735

Females

4531

F18-39

4531

Half→25K

13.1 - 15.5 mi

Top 53%
×4story building
+66ft-88ft

Overall

14157

Females

4319

F18-39

4319

25K→30K

15.5 - 18.6 mi

Top 55%
×9story building
+181ft-148ft

Overall

14560

Females

4664

F18-39

4664

30K→20M

18.6 - 20.0 mi

Top 54%
×5story building
+64ft-50ft

Overall

14275

Females

4587

F18-39

4587

20M→21M

20.0 - 21.0 mi

Top 54%
×8story building
+106ft-24ft

Overall

14502

Females

4765

F18-39

4765

21M→35K

21.0 - 21.8 mi

Top 51%
×7story building
+17ft-86ft

Overall

13489

Females

4288

F18-39

4288

35K→23M

21.8 - 23.0 mi

Top 54%
×5story building
+23ft-63ft

Overall

14274

Females

4774

F18-39

4774

23M→24M

23.0 - 24.0 mi

Top 55%
×6story building
+12ft-82ft

Overall

14695

Females

5063

F18-39

5063

24M→40K

24.0 - 24.9 mi

Top 57%
×1story
+6ft-20ft

Overall

15259

Females

5441

F18-39

5441

40K→25.2M

24.9 - 25.2 mi

Top 62%
×1story
+13ft-16ft

Overall

16396

Females

6090

F18-39

6090

25.2M→Finish

25.2 - 26.2 mi

Top 62%
×2story building
+22ft-21ft

Overall

16582

Females

6136

F18-39

6136

Passing Analysis

Category:
Athletes Passed
2065
Passed By
1140
Net Change
+925
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#15900
5K → 10K226384-158#15900#16058
10K → 15K331103+228#16058#15830
15K → 20K27576+199#15830#15631
20K → Half6012+48#15631#15583
Half → 25K27525+250#15583#15333
25K → 30K26894+174#15333#15159
30K → 20M12142+79#15159#15080
20M → 21M10866+42#15080#15038
21M → 35K8917+72#15038#14966
35K → 23M10750+57#14966#14909
23M → 24M7848+30#14909#14879
24M → 40K6548+17#14879#14862
40K → 25.2M2646-20#14862#14882
25.2M → Finish36129-93#14882#14975
TOTALS20651140+925
📊

Passing Visuals

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