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BOSTON MARATHON 2023

Jennifer Shih

Bib: 11721•F

MA

0:00
0:00
/ mi
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Overall
#0 / 26622
Top 35%
Gender (Female)
#0 / 11423
Top 16%
Division (F18-39)
#0 / 4884
Top 29%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
7:47/mi
24:12
↑ 97↓ 3451.5%
10K· 6.21 mi
7:41/mi
48:05
↑ 79↓ 1380.4%
15K· 9.32 mi
7:39/mi
1:11:51
↑ 67↓ 78
20K· 12.43 mi
7:45/mi
1:35:55
↑ 106↓ 860.1%
Half· 13.11 mi
7:40/mi
1:41:09
↑ 19↓ 370.5%
25K· 15.53 mi
7:44/mi
1:59:53
↑ 66↓ 880.2%
30K· 18.64 mi
7:29/mi
2:23:08
↑ 181↓ 1480.2%
20M
7:39/mi
2:33:32
↑ 64↓ 500.2%
21M
7:51/mi
2:41:23
↑ 106↓ 241.6%
35K· 21.75 mi
7:25/mi
2:46:56
↑ 17↓ 861.7%
23M
7:32/mi
2:56:22
↑ 23↓ 630.6%
24M
7:31/mi
3:03:53
↓ 821.3%
40K· 24.85 mi
7:38/mi
3:10:25
↓ 200.3%
25.2M
8:07/mi
3:13:13
↑ 13↓ 160.2%
Finish· 26.22 mi
7:27/mi
3:20:49
↑ 22↓ 21

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time1:41:09
Pace7:43 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:39:40
Pace7:36 /mi
📊Negative Split: 1.5% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:51:1724:127:4724:12
7:47
-
10K
6.21 mi11:15:1048:057:4423:53
7:41
-0:06
15K
9.32 mi11:38:561:11:517:4323:46
7:39
-0:02
20K
12.43 mi12:03:001:35:557:4324:04
7:45
+0:06
Half
13.11 mi12:08:141:41:097:435:14
7:40
-0:05
25K
15.53 mi12:26:581:59:537:4318:44
7:44
+0:04
30K
18.64 mi12:50:132:23:087:4123:15
7:29
-0:15
20M
20.00 mi13:00:372:33:327:4110:24
7:39
+0:10
21M
21.00 mi13:08:282:41:237:417:51
7:51
+0:12
35K
21.75 mi13:14:012:46:567:415:33
7:25
-0:26
23M
23.00 mi13:23:272:56:227:409:26
7:32
+0:07
24M
24.00 mi13:30:583:03:537:407:31
7:31
-0:01
40K
24.85 mi13:37:303:10:257:406:32
7:38
+0:07
25.2M
25.20 mi13:40:183:13:137:402:48
8:07
+0:29
Finish
26.22 mi13:47:543:20:497:407:36
7:27
-0:40

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

7:25 /mi

Average Pace

7:40 /mi

Slowest Pace

8:07 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:10:10

95% of race

Time at Steady Pace

10:39

5% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:40 /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 mi10:51:1724:127:4724:12
7:47
#12255
10K
6.21 mi11:15:1048:057:4423:53
7:41
#12170
15K
9.32 mi11:38:561:11:517:4323:46
7:39
#11864
20K
12.43 mi12:03:001:35:557:4324:04
7:45
#11671
Half
13.11 mi12:08:141:41:097:435:14
7:40
#11671
25K
15.53 mi12:26:581:59:537:4318:44
7:44
#11440
30K
18.64 mi12:50:132:23:087:4123:15
7:29
#10594
20M
20.00 mi13:00:372:33:327:4110:24
7:39
#10371
21M
21.00 mi13:08:282:41:237:417:51
7:51
#10097
35K
21.75 mi13:14:012:46:567:415:33
7:25
#9989
23M
23.00 mi13:23:272:56:227:409:26
7:32
#9756
24M
24.00 mi13:30:583:03:537:407:31
7:31
#9626
40K
24.85 mi13:37:303:10:257:406:32
7:38
#9520
25.2M
25.20 mi13:40:183:13:137:402:48
8:07
#9468
Finish
26.22 mi13:47:543:20:497:407:36
7:27
#9408
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi122553006300611416(Top 43%)2573(Top 23%)2573(Top 53%)
10K6.21 mi3.10 mi12170+852956+502956+5012119(Top 46%)2932(Top 26%)2932(Top 60%)
15K9.32 mi3.11 mi11864+3062813+1432813+14311416(Top 43%)2573(Top 23%)2573(Top 53%)
20K12.43 mi3.11 mi11671+1932724+892724+8911271(Top 42%)2551(Top 22%)2551(Top 52%)
Half13.11 mi0.68 mi116712725-12725-111631(Top 44%)2675(Top 23%)2675(Top 55%)
25K15.53 mi2.42 mi11440+2312610+1152610+11510501(Top 39%)2224(Top 19%)2224(Top 46%)
30K18.64 mi3.11 mi10594+8462202+4082202+4087131(Top 27%)978(Top 9%)978(Top 20%)
20M20.00 mi1.36 mi10371+2232105+972105+977872(Top 30%)1360(Top 12%)1360(Top 28%)
21M21.00 mi1.00 mi10097+2741987+1181987+1186487(Top 24%)951(Top 8%)951(Top 19%)
35K21.75 mi0.75 mi9989+1081963+241963+247994(Top 30%)1501(Top 13%)1501(Top 31%)
23M23.00 mi1.25 mi9756+2331889+741889+746664(Top 25%)1055(Top 9%)1055(Top 22%)
24M24.00 mi1.00 mi9626+1301853+361853+367850(Top 29%)1625(Top 14%)1625(Top 33%)
40K24.85 mi0.85 mi9520+1061836+171836+177599(Top 29%)1606(Top 14%)1606(Top 33%)
25.2M25.20 mi0.35 mi9468+521826+101826+107302(Top 27%)1546(Top 14%)1546(Top 32%)
Finish26.22 mi1.02 mi9408+601823+31823+38265(Top 31%)1940(Top 17%)1940(Top 40%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 43%
×21story building
+97ft-345ft

Overall

11416

Females

2573

F18-39

2573

5K→10K

3.1 - 6.2 mi

Top 46%
×5story building
+79ft-138ft

Overall

12119

Females

2932

F18-39

2932

10K→15K

6.2 - 9.3 mi

Top 43%
×3story building
+67ft-78ft

Overall

11416

Females

2573

F18-39

2573

15K→20K

9.3 - 12.4 mi

Top 42%
×5story building
+106ft-86ft

Overall

11271

Females

2551

F18-39

2551

20K→Half

12.4 - 13.1 mi

Top 44%
×2story building
+19ft-37ft

Overall

11631

Females

2675

F18-39

2675

Half→25K

13.1 - 15.5 mi

Top 39%
×4story building
+66ft-88ft

Overall

10501

Females

2224

F18-39

2224

25K→30K

15.5 - 18.6 mi

Top 27%
×9story building
+181ft-148ft

Overall

7131

Females

978

F18-39

978

30K→20M

18.6 - 20.0 mi

Top 30%
×5story building
+64ft-50ft

Overall

7872

Females

1360

F18-39

1360

20M→21M

20.0 - 21.0 mi

Top 24%
×8story building
+106ft-24ft

Overall

6487

Females

951

F18-39

951

21M→35K

21.0 - 21.8 mi

Top 30%
×7story building
+17ft-86ft

Overall

7994

Females

1501

F18-39

1501

35K→23M

21.8 - 23.0 mi

Top 25%
×5story building
+23ft-63ft

Overall

6664

Females

1055

F18-39

1055

23M→24M

23.0 - 24.0 mi

Top 29%
×6story building
+12ft-82ft

Overall

7850

Females

1625

F18-39

1625

24M→40K

24.0 - 24.9 mi

Top 29%
×1story
+6ft-20ft

Overall

7599

Females

1606

F18-39

1606

40K→25.2M

24.9 - 25.2 mi

Top 27%
×1story
+13ft-16ft

Overall

7302

Females

1546

F18-39

1546

25.2M→Finish

25.2 - 26.2 mi

Top 31%
×2story building
+22ft-21ft

Overall

8265

Females

1940

F18-39

1940

Passing Analysis

Category:
Athletes Passed
3421*
Passed By
574
Net Change
+2847
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12255
5K → 10K358273+85#12255#12170
10K → 15K38579+306#12170#11864
15K → 20K27683+193#11864#11671
20K → Half26260#11671#11671
Half → 25K25524+231#11671#11440
25K → 30K8460+846#11440#10594
30K → 20M228*5+223#10594#10371
20M → 21M2762+274#10371#10097
21M → 35K122*14+108#10097#9989
35K → 23M2374+233#9989#9756
23M → 24M14212+130#9756#9626
24M → 40K115*9+106#9626#9520
40K → 25.2M575+52#9520#9468
25.2M → Finish9838+60#9468#9408
TOTALS3421*574+2847

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

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