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BOSTON MARATHON 2023

Jennifer Balcom

Bib: 17837•F

WA

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 49%
Gender (Female)
#0 / 11423
Top 33%
Masters (Masters Women)
#0 / 6539
Top 19%
Division (F40-44)
#0 / 1878
Top 36%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
25:14
Rank: #14879
Start → 5K
25:14 | 8:07/mi
10K· 6.21 mi
49:44
Rank: #14422 (+457)
5K → 10K
24:30 | 7:53/mi
15K· 9.32 mi
1:14:02
Rank: #13932 (+490)
10K → 15K
24:18 | 7:49/mi
20K· 12.43 mi
1:38:47
Rank: #13693 (+239)
15K → 20K
24:45 | 7:58/mi
Half· 13.11 mi
1:44:07
Rank: #13650 (+43)
20K → Half
5:20 | 7:49/mi
25K· 15.53 mi
2:03:29
Rank: #13465 (+185)
Half → 25K
19:22 | 7:59/mi
30K· 18.64 mi
2:29:23
Rank: #13398 (+67)
25K → 30K
25:54 | 8:20/mi
20M
2:40:49
Rank: #13350 (+48)
30K → 20M
11:26 | 8:25/mi
21M
2:49:54
Rank: #13375 (-25)
20M → 21M
9:05 | 9:05/mi
35K· 21.75 mi
2:55:48
Rank: #13280 (+95)
21M → 35K
5:54 | 7:53/mi
23M
3:06:17
Rank: #13189 (+91)
35K → 23M
10:29 | 8:22/mi
24M
3:14:18
Rank: #13084 (+105)
23M → 24M
8:01 | 8:01/mi
40K· 24.85 mi
3:21:27
Rank: #13046 (+38)
24M → 40K
7:09 | 8:22/mi
25.2M
3:24:39
Rank: #13055 (-9)
40K → 25.2M
3:12 | 9:17/mi
Finish· 26.22 mi
3:32:54
Rank: #13032 (+23)
25.2M → Finish
8:15 | 8:06/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:44:07
Pace7:57 /mi
2nd Half
Distance13.11 mi
Time1:48:47
Pace8:18 /mi
📊Positive Split: 4.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:20:3725:148:0725:14
8:07
-
10K
6.21 mi11:45:0749:448:0024:30
7:53
-0:14
15K
9.32 mi12:09:251:14:027:5724:18
7:49
-0:04
20K
12.43 mi12:34:101:38:477:5724:45
7:58
+0:09
Half
13.11 mi12:39:301:44:077:575:20
7:49
-0:09
25K
15.53 mi12:58:522:03:297:5719:22
7:59
+0:10
30K
18.64 mi13:24:462:29:238:0125:54
8:20
+0:21
20M
20.00 mi13:36:122:40:498:0211:26
8:25
+0:05
21M
21.00 mi13:45:172:49:548:059:05
9:05
+0:40
35K
21.75 mi13:51:112:55:488:055:54
7:53
-1:12
23M
23.00 mi14:01:403:06:178:0610:29
8:22
+0:29
24M
24.00 mi14:09:413:14:188:068:01
8:01
-0:21
40K
24.85 mi14:16:503:21:278:067:09
8:22
+0:21
25.2M
25.20 mi14:20:023:24:398:073:12
9:17
+0:55
Finish
26.22 mi14:28:173:32:548:088:15
8:06
-1:11

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

7:49 /mi

Average Pace

8:08 /mi

Slowest Pace

9:17 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:20:37

94% of race

Time at Steady Pace

9:05

4% of race

Time at Slower Pace

3:12

2% of race

Average Pace: 8:07 /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 mi11:20:3725:148:0725:14
8:07
#14879
10K
6.21 mi11:45:0749:448:0024:30
7:53
#14422
15K
9.32 mi12:09:251:14:027:5724:18
7:49
#13932
20K
12.43 mi12:34:101:38:477:5724:45
7:58
#13693
Half
13.11 mi12:39:301:44:077:575:20
7:49
#13650
25K
15.53 mi12:58:522:03:297:5719:22
7:59
#13465
30K
18.64 mi13:24:462:29:238:0125:54
8:20
#13398
20M
20.00 mi13:36:122:40:498:0211:26
8:25
#13350
21M
21.00 mi13:45:172:49:548:059:05
9:05
#13375
35K
21.75 mi13:51:112:55:488:055:54
7:53
#13280
23M
23.00 mi14:01:403:06:178:0610:29
8:22
#13189
24M
24.00 mi14:09:413:14:188:068:01
8:01
#13084
40K
24.85 mi14:16:503:21:278:067:09
8:22
#13046
25.2M
25.20 mi14:20:023:24:398:073:12
9:17
#13055
Finish
26.22 mi14:28:173:32:548:088:15
8:06
#13032
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi148794565456512919(Top 49%)3426(Top 30%)3426(Top 182%)
10K6.21 mi3.10 mi14422+4574295+2704295+27013874(Top 52%)3966(Top 35%)3966(Top 211%)
15K9.32 mi3.11 mi13932+4904020+2754020+27512919(Top 49%)3426(Top 30%)3426(Top 182%)
20K12.43 mi3.11 mi13693+2393904+1163904+11613166(Top 49%)3636(Top 32%)3636(Top 194%)
Half13.11 mi0.68 mi13650+433879+253879+2512940(Top 49%)3469(Top 30%)3469(Top 185%)
25K15.53 mi2.42 mi13465+1853784+953784+9512664(Top 48%)3456(Top 30%)3456(Top 184%)
30K18.64 mi3.11 mi13398+673778+63778+613279(Top 50%)3905(Top 34%)3905(Top 208%)
20M20.00 mi1.36 mi13350+483767+113767+1113111(Top 49%)3918(Top 34%)3918(Top 209%)
21M21.00 mi1.00 mi13375-253798-313798-3113900(Top 52%)4433(Top 39%)4433(Top 236%)
35K21.75 mi0.75 mi13280+953759+393759+3911359(Top 43%)3066(Top 27%)3066(Top 163%)
23M23.00 mi1.25 mi13189+913728+313728+3112418(Top 47%)3748(Top 33%)3748(Top 200%)
24M24.00 mi1.00 mi13084+1053698+303698+3011396(Top 43%)3291(Top 29%)3291(Top 175%)
40K24.85 mi0.85 mi13046+383703-53703-512493(Top 47%)3934(Top 34%)3934(Top 209%)
25.2M25.20 mi0.35 mi13055-93718-153718-1514114(Top 53%)4798(Top 42%)4798(Top 255%)
Finish26.22 mi1.02 mi13032+233719-13719-112769(Top 48%)4093(Top 36%)4093(Top 218%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 49%
×21stories
+97ft-345ft

Overall

12919

Females

3426

F40-44

3426

5K→10K

3.1 - 6.2 mi

Top 52%
×5stories
+79ft-138ft

Overall

13874

Females

3966

F40-44

3966

10K→15K

6.2 - 9.3 mi

Top 49%
×3stories
+67ft-78ft

Overall

12919

Females

3426

F40-44

3426

15K→20K

9.3 - 12.4 mi

Top 49%
×5stories
+106ft-86ft

Overall

13166

Females

3636

F40-44

3636

20K→Half

12.4 - 13.1 mi

Top 49%
×2stories
+19ft-37ft

Overall

12940

Females

3469

F40-44

3469

Half→25K

13.1 - 15.5 mi

Top 48%
×4stories
+66ft-88ft

Overall

12664

Females

3456

F40-44

3456

25K→30K

15.5 - 18.6 mi

Top 50%
×9stories
+181ft-148ft

Overall

13279

Females

3905

F40-44

3905

30K→20M

18.6 - 20.0 mi

Top 49%
×5stories
+64ft-50ft

Overall

13111

Females

3918

F40-44

3918

20M→21M

20.0 - 21.0 mi

Top 52%
×8stories
+106ft-24ft

Overall

13900

Females

4433

F40-44

4433

21M→35K

21.0 - 21.8 mi

Top 43%
×7stories
+17ft-86ft

Overall

11359

Females

3066

F40-44

3066

35K→23M

21.8 - 23.0 mi

Top 47%
×5stories
+23ft-63ft

Overall

12418

Females

3748

F40-44

3748

23M→24M

23.0 - 24.0 mi

Top 43%
×6stories
+12ft-82ft

Overall

11396

Females

3291

F40-44

3291

24M→40K

24.0 - 24.9 mi

Top 47%
×1story
+6ft-20ft

Overall

12493

Females

3934

F40-44

3934

40K→25.2M

24.9 - 25.2 mi

Top 53%
×1story
+13ft-16ft

Overall

14114

Females

4798

F40-44

4798

25.2M→Finish

25.2 - 26.2 mi

Top 48%
×2stories
+22ft-21ft

Overall

12769

Females

4093

F40-44

4093

Passing Analysis

Category:
Athletes Passed
2643
Passed By
796
Net Change
+1847
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#14879
5K → 10K575118+457#14879#14422
10K → 15K53141+490#14422#13932
15K → 20K30162+239#13932#13693
20K → Half518+43#13693#13650
Half → 25K22742+185#13650#13465
25K → 30K223156+67#13465#13398
30K → 20M10456+48#13398#13350
20M → 21M80105-25#13350#13375
21M → 35K10813+95#13375#13280
35K → 23M13443+91#13280#13189
23M → 24M12621+105#13189#13084
24M → 40K8345+38#13084#13046
40K → 25.2M2332-9#13046#13055
25.2M → Finish7754+23#13055#13032
TOTALS2643796+1847
📊

Passing Visuals

Category:

📈Position Graph

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🎨Heatmap Timeline

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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