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BOSTON MARATHON 2023

Jennifer Blazer

Bib: 21911•F

OH

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Masters (Masters Women)
#0 / 6539
Division (F50-54)
#0 / 1207
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
8:56/mi
27:45
↑ 97↓ 3451.5%
10K· 6.21 mi
8:55/mi
55:27
↑ 79↓ 1380.4%
15K· 9.32 mi
8:51/mi
1:22:56
↑ 67↓ 78
20K· 12.43 mi
8:58/mi
1:50:47
↑ 106↓ 860.1%
Half· 13.11 mi
8:55/mi
1:56:52
↑ 19↓ 370.5%
25K· 15.53 mi
9:05/mi
2:18:53
↑ 66↓ 880.2%
30K· 18.64 mi
9:23/mi
2:48:01
↑ 181↓ 1480.2%
20M
9:31/mi
3:00:57
↑ 64↓ 500.2%
21M
11:37/mi
3:12:34
↑ 106↓ 241.6%
35K· 21.75 mi
9:16/mi
3:19:30
↑ 17↓ 861.7%
23M
9:15/mi
3:31:05
↑ 23↓ 630.6%
24M
9:08/mi
3:40:13
↓ 821.3%
40K· 24.85 mi
9:18/mi
3:48:10
↓ 200.3%
25.2M
10:00/mi
3:51:37
↑ 13↓ 160.2%
Finish· 26.22 mi
9:02/mi
4:00:49
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:56:52
Pace8:55 /mi
2nd Half
Distance13.11 mi
Time2:03:57
Pace9:27 /mi
📊Positive Split: 6.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:24:4027:458:5627:45
8:56
-
10K
6.21 mi11:52:2255:278:5527:42
8:55
-0:01
15K
9.32 mi12:19:511:22:568:5427:29
8:51
-0:04
20K
12.43 mi12:47:421:50:478:5527:51
8:58
+0:07
Half
13.11 mi12:53:471:56:528:556:05
8:55
-0:03
25K
15.53 mi13:15:482:18:538:5622:01
9:05
+0:10
30K
18.64 mi13:44:562:48:019:0129:08
9:23
+0:18
20M
20.00 mi13:57:523:00:579:0312:56
9:31
+0:08
21M
21.00 mi14:09:293:12:349:1011:37
11:37
+2:06
35K
21.75 mi14:16:253:19:309:106:56
9:16
-2:21
23M
23.00 mi14:28:003:31:059:1111:35
9:15
-0:01
24M
24.00 mi14:37:083:40:139:119:08
9:08
-0:07
40K
24.85 mi14:45:053:48:109:117:57
9:18
+0:10
25.2M
25.20 mi14:48:323:51:379:113:27
10:00
+0:42
Finish
26.22 mi14:57:444:00:499:119:12
9:02
-0:58

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

8:51 /mi

Average Pace

9:11 /mi

Slowest Pace

11:37 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

0:00

0% of race

Time at Steady Pace

3:32:49

88% of race

Time at Slower Pace

28:00

12% of race

Average Pace: 9:11 /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 mi11:24:4027:458:5627:45
8:56
#20131
10K
6.21 mi11:52:2255:278:5527:42
8:55
#20322
15K
9.32 mi12:19:511:22:568:5427:29
8:51
#20116
20K
12.43 mi12:47:421:50:478:5527:51
8:58
#19931
Half
13.11 mi12:53:471:56:528:556:05
8:55
#19931
25K
15.53 mi13:15:482:18:538:5622:01
9:05
#19842
30K
18.64 mi13:44:562:48:019:0129:08
9:23
#19650
20M
20.00 mi13:57:523:00:579:0312:56
9:31
#19593
21M
21.00 mi14:09:293:12:349:1011:37
11:37
#19805
35K
21.75 mi14:16:253:19:309:106:56
9:16
#19779
23M
23.00 mi14:28:003:31:059:1111:35
9:15
#19646
24M
24.00 mi14:37:083:40:139:119:08
9:08
#19571
40K
24.85 mi14:45:053:48:109:117:57
9:18
#19502
25.2M
25.20 mi14:48:323:51:379:113:27
10:00
#19475
Finish
26.22 mi14:57:444:00:499:119:12
9:02
#19448
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF50-54Seg. OverallSeg. FemalesSeg. F50-54
5K3.11 mi3.11 mi201317896789619783(Top 74%)7556(Top 66%)7556(Top 626%)
10K6.21 mi3.10 mi20322-1917931-357931-3520497(Top 77%)7976(Top 70%)7976(Top 661%)
15K9.32 mi3.11 mi20116+2067803+1287803+12819783(Top 74%)7556(Top 66%)7556(Top 626%)
20K12.43 mi3.11 mi19931+1857686+1177686+11719539(Top 73%)7403(Top 65%)7403(Top 613%)
Half13.11 mi0.68 mi199317684+27684+220082(Top 75%)7709(Top 67%)7709(Top 639%)
25K15.53 mi2.42 mi19842+897630+547630+5419338(Top 73%)7329(Top 64%)7329(Top 607%)
30K18.64 mi3.11 mi19650+1927517+1137517+11318946(Top 71%)7168(Top 63%)7168(Top 594%)
20M20.00 mi1.36 mi19593+577499+187499+1818944(Top 71%)7270(Top 64%)7270(Top 602%)
21M21.00 mi1.00 mi19805-2127627-1287627-12822088(Top 83%)9043(Top 79%)9043(Top 749%)
35K21.75 mi0.75 mi19779+267618+97618+919040(Top 72%)7410(Top 65%)7410(Top 614%)
23M23.00 mi1.25 mi19646+1337550+687550+6817327(Top 65%)6470(Top 57%)6470(Top 536%)
24M24.00 mi1.00 mi19571+757522+287522+2817824(Top 67%)6817(Top 60%)6817(Top 565%)
40K24.85 mi0.85 mi19502+697491+317491+3117548(Top 66%)6713(Top 59%)6713(Top 556%)
25.2M25.20 mi0.35 mi19475+277480+117480+1117470(Top 66%)6703(Top 59%)6703(Top 555%)
Finish26.22 mi1.02 mi19448+277469+117469+1118136(Top 68%)6974(Top 61%)6974(Top 578%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 74%
×21story building
+97ft-345ft

Overall

19783

Females

7556

F50-54

7556

5K→10K

3.1 - 6.2 mi

Top 77%
×5story building
+79ft-138ft

Overall

20497

Females

7976

F50-54

7976

10K→15K

6.2 - 9.3 mi

Top 74%
×3story building
+67ft-78ft

Overall

19783

Females

7556

F50-54

7556

15K→20K

9.3 - 12.4 mi

Top 73%
×5story building
+106ft-86ft

Overall

19539

Females

7403

F50-54

7403

20K→Half

12.4 - 13.1 mi

Top 75%
×2story building
+19ft-37ft

Overall

20082

Females

7709

F50-54

7709

Half→25K

13.1 - 15.5 mi

Top 73%
×4story building
+66ft-88ft

Overall

19338

Females

7329

F50-54

7329

25K→30K

15.5 - 18.6 mi

Top 71%
×9story building
+181ft-148ft

Overall

18946

Females

7168

F50-54

7168

30K→20M

18.6 - 20.0 mi

Top 71%
×5story building
+64ft-50ft

Overall

18944

Females

7270

F50-54

7270

20M→21M

20.0 - 21.0 mi

Top 83%
×8story building
+106ft-24ft

Overall

22088

Females

9043

F50-54

9043

21M→35K

21.0 - 21.8 mi

Top 72%
×7story building
+17ft-86ft

Overall

19040

Females

7410

F50-54

7410

35K→23M

21.8 - 23.0 mi

Top 65%
×5story building
+23ft-63ft

Overall

17327

Females

6470

F50-54

6470

23M→24M

23.0 - 24.0 mi

Top 67%
×6story building
+12ft-82ft

Overall

17824

Females

6817

F50-54

6817

24M→40K

24.0 - 24.9 mi

Top 66%
×1story
+6ft-20ft

Overall

17548

Females

6713

F50-54

6713

40K→25.2M

24.9 - 25.2 mi

Top 66%
×1story
+13ft-16ft

Overall

17470

Females

6703

F50-54

6703

25.2M→Finish

25.2 - 26.2 mi

Top 68%
×2story building
+22ft-21ft

Overall

18136

Females

6974

F50-54

6974

Passing Analysis

Category:
Athletes Passed
1854
Passed By
1171
Net Change
+683
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20131
5K → 10K205396-191#20131#20322
10K → 15K308102+206#20322#20116
15K → 20K26479+185#20116#19931
20K → Half33330#19931#19931
Half → 25K16677+89#19931#19842
25K → 30K26674+192#19842#19650
30K → 20M10649+57#19650#19593
20M → 21M32244-212#19593#19805
21M → 35K5731+26#19805#19779
35K → 23M14310+133#19779#19646
23M → 24M9621+75#19646#19571
24M → 40K8617+69#19571#19502
40K → 25.2M325+27#19502#19475
25.2M → Finish6033+27#19475#19448
TOTALS18541171+683
📊

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