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BOSTON MARATHON 2023

Alice Nielsen

Bib: 17821•F

OR

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 41%
Gender (Female)
#0 / 11423
Top 22%
Masters (Masters Women)
#0 / 6539
Top 11%
Division (F45-49)
#0 / 1817
Top 11%
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
7:45/mi
24:05
↑ 97↓ 3451.5%
10K· 6.21 mi
7:35/mi
47:39
↑ 79↓ 1380.4%
15K· 9.32 mi
7:40/mi
1:11:27
↑ 67↓ 78
20K· 12.43 mi
7:48/mi
1:35:42
↑ 106↓ 860.1%
Half· 13.11 mi
7:34/mi
1:40:52
↑ 19↓ 370.5%
25K· 15.53 mi
7:59/mi
2:00:13
↑ 66↓ 880.2%
30K· 18.64 mi
8:09/mi
2:25:31
↑ 181↓ 1480.2%
20M
8:04/mi
2:36:29
↑ 64↓ 500.2%
21M
8:36/mi
2:45:05
↑ 106↓ 241.6%
35K· 21.75 mi
7:45/mi
2:50:53
↑ 17↓ 861.7%
23M
8:02/mi
3:00:56
↑ 23↓ 630.6%
24M
7:43/mi
3:08:39
↓ 821.3%
40K· 24.85 mi
7:53/mi
3:15:23
↓ 200.3%
25.2M
8:30/mi
3:18:19
↑ 13↓ 160.2%
Finish· 26.22 mi
7:27/mi
3:25:55
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:40:52
Pace7:42 /mi
2nd Half
Distance13.11 mi
Time1:45:03
Pace8:01 /mi
📊Positive Split: 4.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:14:3324:057:4524:05
7:45
-
10K
6.21 mi11:38:0747:397:4023:34
7:35
-0:10
15K
9.32 mi12:01:551:11:277:4023:48
7:40
+0:05
20K
12.43 mi12:26:101:35:427:4224:15
7:48
+0:08
Half
13.11 mi12:31:201:40:527:425:10
7:34
-0:14
25K
15.53 mi12:50:412:00:137:4419:21
7:59
+0:25
30K
18.64 mi13:15:592:25:317:4825:18
8:09
+0:10
20M
20.00 mi13:26:572:36:297:4910:58
8:04
-0:05
21M
21.00 mi13:35:332:45:057:528:36
8:36
+0:32
35K
21.75 mi13:41:212:50:537:515:48
7:45
-0:51
23M
23.00 mi13:51:243:00:567:5210:03
8:02
+0:17
24M
24.00 mi13:59:073:08:397:527:43
7:43
-0:19
40K
24.85 mi14:05:513:15:237:526:44
7:53
+0:10
25.2M
25.20 mi14:08:473:18:197:522:56
8:30
+0:37
Finish
26.22 mi14:16:233:25:557:527:36
7:27
-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

7:27 /mi

Average Pace

7:52 /mi

Slowest Pace

8:36 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:14:23

94% of race

Time at Steady Pace

11:32

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:51 /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 mi11:14:3324:057:4524:05
7:45
#11941
10K
6.21 mi11:38:0747:397:4023:34
7:35
#11512
15K
9.32 mi12:01:551:11:277:4023:48
7:40
#11501
20K
12.43 mi12:26:101:35:427:4224:15
7:48
#11542
Half
13.11 mi12:31:201:40:527:425:10
7:34
#11491
25K
15.53 mi12:50:412:00:137:4419:21
7:59
#11610
30K
18.64 mi13:15:592:25:317:4825:18
8:09
#11663
20M
20.00 mi13:26:572:36:297:4910:58
8:04
#11574
21M
21.00 mi13:35:332:45:057:528:36
8:36
#11524
35K
21.75 mi13:41:212:50:537:515:48
7:45
#11464
23M
23.00 mi13:51:243:00:567:5210:03
8:02
#11354
24M
24.00 mi13:59:073:08:397:527:43
7:43
#11247
40K
24.85 mi14:05:513:15:237:526:44
7:53
#11128
25.2M
25.20 mi14:08:473:18:197:522:56
8:30
#11087
Finish
26.22 mi14:16:233:25:557:527:36
7:27
#10948
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi119412834283411520(Top 43%)2642(Top 23%)2642(Top 145%)
10K6.21 mi3.10 mi11512+4292610+2242610+22411198(Top 42%)2430(Top 21%)2430(Top 134%)
15K9.32 mi3.11 mi11501+112604+62604+611520(Top 43%)2642(Top 23%)2642(Top 145%)
20K12.43 mi3.11 mi11542-412650-462650-4611794(Top 44%)2843(Top 25%)2843(Top 156%)
Half13.11 mi0.68 mi11491+512619+312619+3110883(Top 41%)2312(Top 20%)2312(Top 127%)
25K15.53 mi2.42 mi11610-1192704-852704-8512588(Top 47%)3405(Top 30%)3405(Top 187%)
30K18.64 mi3.11 mi11663-532784-802784-8011944(Top 45%)3150(Top 28%)3150(Top 173%)
20M20.00 mi1.36 mi11574+892753+312753+3110817(Top 41%)2645(Top 23%)2645(Top 146%)
21M21.00 mi1.00 mi11524+502745+82745+811068(Top 42%)2903(Top 25%)2903(Top 160%)
35K21.75 mi0.75 mi11464+602727+182727+1810338(Top 39%)2527(Top 22%)2527(Top 139%)
23M23.00 mi1.25 mi11354+1102692+352692+359962(Top 37%)2494(Top 22%)2494(Top 137%)
24M24.00 mi1.00 mi11247+1072649+432649+439226(Top 35%)2214(Top 19%)2214(Top 122%)
40K24.85 mi0.85 mi11128+1192613+362613+369204(Top 35%)2266(Top 20%)2266(Top 125%)
25.2M25.20 mi0.35 mi11087+412608+52608+59650(Top 36%)2533(Top 22%)2533(Top 139%)
Finish26.22 mi1.02 mi10948+1392565+432565+438274(Top 31%)1949(Top 17%)1949(Top 107%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 43%
×21story building
+97ft-345ft

Overall

11520

Females

2642

F45-49

2642

5K→10K

3.1 - 6.2 mi

Top 42%
×5story building
+79ft-138ft

Overall

11198

Females

2430

F45-49

2430

10K→15K

6.2 - 9.3 mi

Top 43%
×3story building
+67ft-78ft

Overall

11520

Females

2642

F45-49

2642

15K→20K

9.3 - 12.4 mi

Top 44%
×5story building
+106ft-86ft

Overall

11794

Females

2843

F45-49

2843

20K→Half

12.4 - 13.1 mi

Top 41%
×2story building
+19ft-37ft

Overall

10883

Females

2312

F45-49

2312

Half→25K

13.1 - 15.5 mi

Top 47%
×4story building
+66ft-88ft

Overall

12588

Females

3405

F45-49

3405

25K→30K

15.5 - 18.6 mi

Top 45%
×9story building
+181ft-148ft

Overall

11944

Females

3150

F45-49

3150

30K→20M

18.6 - 20.0 mi

Top 41%
×5story building
+64ft-50ft

Overall

10817

Females

2645

F45-49

2645

20M→21M

20.0 - 21.0 mi

Top 42%
×8story building
+106ft-24ft

Overall

11068

Females

2903

F45-49

2903

21M→35K

21.0 - 21.8 mi

Top 39%
×7story building
+17ft-86ft

Overall

10338

Females

2527

F45-49

2527

35K→23M

21.8 - 23.0 mi

Top 37%
×5story building
+23ft-63ft

Overall

9962

Females

2494

F45-49

2494

23M→24M

23.0 - 24.0 mi

Top 35%
×6story building
+12ft-82ft

Overall

9226

Females

2214

F45-49

2214

24M→40K

24.0 - 24.9 mi

Top 35%
×1story
+6ft-20ft

Overall

9204

Females

2266

F45-49

2266

40K→25.2M

24.9 - 25.2 mi

Top 36%
×1story
+13ft-16ft

Overall

9650

Females

2533

F45-49

2533

25.2M→Finish

25.2 - 26.2 mi

Top 31%
×2story building
+22ft-21ft

Overall

8274

Females

1949

F45-49

1949

Passing Analysis

Category:
Athletes Passed
2160
Passed By
1167
Net Change
+993
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11941
5K → 10K569140+429#11941#11512
10K → 15K198187+11#11512#11501
15K → 20K135176-41#11501#11542
20K → Half6211+51#11542#11491
Half → 25K93212-119#11491#11610
25K → 30K157210-53#11610#11663
30K → 20M13950+89#11663#11574
20M → 21M11262+50#11574#11524
21M → 35K8121+60#11524#11464
35K → 23M15545+110#11464#11354
23M → 24M12518+107#11354#11247
24M → 40K13011+119#11247#11128
40K → 25.2M5413+41#11128#11087
25.2M → Finish15011+139#11087#10948
TOTALS21601167+993
📊

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