Boston Marathon logo
BOSTON MARATHON 2023

Natasha Henderson

Bib: 19420•F

TX

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Female)
#0 / 11423
Masters (Masters Women)
#0 / 6539
Division (F40-44)
#0 / 1878
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
8:27/mi
26:14
↑ 97↓ 3451.5%
10K· 6.21 mi
8:20/mi
52:06
↑ 79↓ 1380.4%
15K· 9.32 mi
8:28/mi
1:18:24
↑ 67↓ 78
20K· 12.43 mi
8:38/mi
1:45:14
↑ 106↓ 860.1%
Half· 13.11 mi
8:46/mi
1:51:13
↑ 19↓ 370.5%
25K· 15.53 mi
9:00/mi
2:13:02
↑ 66↓ 880.2%
30K· 18.64 mi
10:00/mi
2:44:05
↑ 181↓ 1480.2%
20M
10:09/mi
2:57:53
↑ 64↓ 500.2%
21M
10:46/mi
3:08:39
↑ 106↓ 241.6%
35K· 21.75 mi
9:05/mi
3:15:27
↑ 17↓ 861.7%
23M
10:02/mi
3:28:01
↑ 23↓ 630.6%
24M
9:48/mi
3:37:49
↓ 821.3%
40K· 24.85 mi
9:53/mi
3:46:16
↓ 200.3%
25.2M
10:15/mi
3:49:48
↑ 13↓ 160.2%
Finish· 26.22 mi
8:52/mi
3:58:50
↑ 22↓ 21

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:51:13
Pace8:29 /mi
2nd Half
Distance13.11 mi
Time2:07:37
Pace9:44 /mi
📊Positive Split: 14.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:17:5226:148:2726:14
8:27
-
10K
6.21 mi11:43:4452:068:2325:52
8:20
-0:07
15K
9.32 mi12:10:021:18:248:2526:18
8:28
+0:08
20K
12.43 mi12:36:521:45:148:2826:50
8:38
+0:10
Half
13.11 mi12:42:511:51:138:295:59
8:46
+0:08
25K
15.53 mi13:04:402:13:028:3421:49
9:00
+0:14
30K
18.64 mi13:35:432:44:058:4831:03
10:00
+1:00
20M
20.00 mi13:49:312:57:538:5413:48
10:09
+0:09
21M
21.00 mi14:00:173:08:398:5910:46
10:46
+0:37
35K
21.75 mi14:07:053:15:278:596:48
9:05
-1:41
23M
23.00 mi14:19:393:28:019:0312:34
10:02
+0:57
24M
24.00 mi14:29:273:37:499:059:48
9:48
-0:14
40K
24.85 mi14:37:543:46:169:068:27
9:53
+0:05
25.2M
25.20 mi14:41:263:49:489:073:32
10:15
+0:22
Finish
26.22 mi14:50:283:58:509:079:02
8:52
-1:23

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

8:20 /mi

Average Pace

9:07 /mi

Slowest Pace

10:46 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:45:14

44% of race

Time at Steady Pace

43:38

18% of race

Time at Slower Pace

1:29:58

38% of race

Average Pace: 9:07 /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 mi11:17:5226:148:2726:14
8:27
#17193
10K
6.21 mi11:43:4452:068:2325:52
8:20
#17116
15K
9.32 mi12:10:021:18:248:2526:18
8:28
#17277
20K
12.43 mi12:36:521:45:148:2826:50
8:38
#17365
Half
13.11 mi12:42:511:51:138:295:59
8:46
#17447
25K
15.53 mi13:04:402:13:028:3421:49
9:00
#17706
30K
18.64 mi13:35:432:44:058:4831:03
10:00
#18601
20M
20.00 mi13:49:312:57:538:5413:48
10:09
#18848
21M
21.00 mi14:00:173:08:398:5910:46
10:46
#18977
35K
21.75 mi14:07:053:15:278:596:48
9:05
#18952
23M
23.00 mi14:19:393:28:019:0312:34
10:02
#19055
24M
24.00 mi14:29:273:37:499:059:48
9:48
#19111
40K
24.85 mi14:37:543:46:169:068:27
9:53
#19162
25.2M
25.20 mi14:41:263:49:489:073:32
10:15
#19139
Finish
26.22 mi14:50:283:58:509:079:02
8:52
#19102
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi171936063606317584(Top 66%)6265(Top 55%)6265(Top 334%)
10K6.21 mi3.10 mi17116+775999+645999+6417114(Top 64%)5946(Top 52%)5946(Top 317%)
15K9.32 mi3.11 mi17277-1616081-826081-8217584(Top 66%)6265(Top 55%)6265(Top 334%)
20K12.43 mi3.11 mi17365-886138-576138-5717738(Top 67%)6368(Top 56%)6368(Top 339%)
Half13.11 mi0.68 mi17447-826186-486186-4819378(Top 73%)7311(Top 64%)7311(Top 389%)
25K15.53 mi2.42 mi17706-2596356-1706356-17018954(Top 71%)7106(Top 62%)7106(Top 378%)
30K18.64 mi3.11 mi18601-8956924-5686924-56821017(Top 79%)8353(Top 73%)8353(Top 445%)
20M20.00 mi1.36 mi18848-2477069-1457069-14520895(Top 78%)8349(Top 73%)8349(Top 445%)
21M21.00 mi1.00 mi18977-1297154-857154-8520303(Top 76%)8091(Top 71%)8091(Top 431%)
35K21.75 mi0.75 mi18952+257149+57149+518304(Top 69%)7005(Top 61%)7005(Top 373%)
23M23.00 mi1.25 mi19055-1037217-687217-6820095(Top 75%)8008(Top 70%)8008(Top 426%)
24M24.00 mi1.00 mi19111-567260-437260-4320229(Top 76%)8103(Top 71%)8103(Top 431%)
40K24.85 mi0.85 mi19162-517293-337293-3319653(Top 74%)7862(Top 69%)7862(Top 419%)
25.2M25.20 mi0.35 mi19139+237283+107283+1018323(Top 69%)7132(Top 62%)7132(Top 380%)
Finish26.22 mi1.02 mi19102+377268+157268+1517366(Top 65%)6574(Top 58%)6574(Top 350%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 66%
×21story building
+97ft-345ft

Overall

17584

Females

6265

F40-44

6265

5K→10K

3.1 - 6.2 mi

Top 64%
×5story building
+79ft-138ft

Overall

17114

Females

5946

F40-44

5946

10K→15K

6.2 - 9.3 mi

Top 66%
×3story building
+67ft-78ft

Overall

17584

Females

6265

F40-44

6265

15K→20K

9.3 - 12.4 mi

Top 67%
×5story building
+106ft-86ft

Overall

17738

Females

6368

F40-44

6368

20K→Half

12.4 - 13.1 mi

Top 73%
×2story building
+19ft-37ft

Overall

19378

Females

7311

F40-44

7311

Half→25K

13.1 - 15.5 mi

Top 71%
×4story building
+66ft-88ft

Overall

18954

Females

7106

F40-44

7106

25K→30K

15.5 - 18.6 mi

Top 79%
×9story building
+181ft-148ft

Overall

21017

Females

8353

F40-44

8353

30K→20M

18.6 - 20.0 mi

Top 78%
×5story building
+64ft-50ft

Overall

20895

Females

8349

F40-44

8349

20M→21M

20.0 - 21.0 mi

Top 76%
×8story building
+106ft-24ft

Overall

20303

Females

8091

F40-44

8091

21M→35K

21.0 - 21.8 mi

Top 69%
×7story building
+17ft-86ft

Overall

18304

Females

7005

F40-44

7005

35K→23M

21.8 - 23.0 mi

Top 75%
×5story building
+23ft-63ft

Overall

20095

Females

8008

F40-44

8008

23M→24M

23.0 - 24.0 mi

Top 76%
×6story building
+12ft-82ft

Overall

20229

Females

8103

F40-44

8103

24M→40K

24.0 - 24.9 mi

Top 74%
×1story
+6ft-20ft

Overall

19653

Females

7862

F40-44

7862

40K→25.2M

24.9 - 25.2 mi

Top 69%
×1story
+13ft-16ft

Overall

18323

Females

7132

F40-44

7132

25.2M→Finish

25.2 - 26.2 mi

Top 65%
×2story building
+22ft-21ft

Overall

17366

Females

6574

F40-44

6574

Passing Analysis

Category:
Athletes Passed
1070
Passed By
2979
Net Change
-1909
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17193
5K → 10K355278+77#17193#17116
10K → 15K128289-161#17116#17277
15K → 20K135223-88#17277#17365
20K → Half1193-82#17365#17447
Half → 25K55314-259#17447#17706
25K → 30K33928-895#17706#18601
30K → 20M30277-247#18601#18848
20M → 21M38167-129#18848#18977
21M → 35K5732+25#18977#18952
35K → 23M52155-103#18952#19055
23M → 24M3995-56#19055#19111
24M → 40K3788-51#19111#19162
40K → 25.2M3613+23#19162#19139
25.2M → Finish6427+37#19139#19102
TOTALS10702979-1909
📊

Passing Visuals

Category:
Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing