Boston Marathon logo
BOSTON MARATHON 2023

Lena Josifi

Bib: 8760•F

IL

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 29%
Gender (Female)
#0 / 11423
Top 10%
Division (F18-39)
#0 / 4884
Top 19%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:15
Rank: #9512
Start → 5K
23:15 | 7:29/mi
10K· 6.21 mi
46:26
Rank: #9782 (-270)
5K → 10K
23:11 | 7:28/mi
15K· 9.32 mi
1:09:33
Rank: #9706 (+76)
10K → 15K
23:07 | 7:26/mi
20K· 12.43 mi
1:32:45
Rank: #9527 (+179)
15K → 20K
23:12 | 7:28/mi
Half· 13.11 mi
1:37:48
Rank: #9519 (+8)
20K → Half
5:03 | 7:24/mi
25K· 15.53 mi
1:55:54
Rank: #9322 (+197)
Half → 25K
18:06 | 7:28/mi
30K· 18.64 mi
2:19:35
Rank: #9071 (+251)
25K → 30K
23:41 | 7:37/mi
20M
2:29:58
Rank: #8940 (+131)
30K → 20M
10:23 | 7:38/mi
21M
2:37:53
Rank: #8799 (+141)
20M → 21M
7:55 | 7:55/mi
35K· 21.75 mi
2:43:16
Rank: #8691 (+108)
21M → 35K
5:23 | 7:12/mi
23M
2:52:20
Rank: #8407 (+284)
35K → 23M
9:04 | 7:14/mi
24M
2:59:20
Rank: #8182 (+225)
23M → 24M
7:00 | 7:00/mi
40K· 24.85 mi
3:05:25
Rank: #7983 (+199)
24M → 40K
6:05 | 7:07/mi
25.2M
3:07:58
Rank: #7898 (+85)
40K → 25.2M
2:33 | 7:24/mi
Finish· 26.22 mi
3:14:51
Rank: #7699 (+199)
25.2M → Finish
6:53 | 6:45/mi

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 Half⚖️ Balanced
Distance13.11 mi
Time1:37:48
Pace7:28 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:37:03
Pace7:24 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:48:4623:157:2923:15
7:29
-
10K
6.21 mi11:11:5746:267:2823:11
7:28
-0:01
15K
9.32 mi11:35:041:09:337:2823:07
7:26
-0:02
20K
12.43 mi11:58:161:32:457:2823:12
7:28
+0:02
Half
13.11 mi12:03:191:37:487:285:03
7:24
-0:04
25K
15.53 mi12:21:251:55:547:2818:06
7:28
+0:04
30K
18.64 mi12:45:062:19:357:2923:41
7:37
+0:09
20M
20.00 mi12:55:292:29:587:3010:23
7:38
+0:01
21M
21.00 mi13:03:242:37:537:317:55
7:55
+0:17
35K
21.75 mi13:08:472:43:167:305:23
7:12
-0:43
23M
23.00 mi13:17:512:52:207:309:04
7:14
+0:02
24M
24.00 mi13:24:512:59:207:287:00
7:00
-0:14
40K
24.85 mi13:30:563:05:257:286:05
7:07
+0:07
25.2M
25.20 mi13:33:293:07:587:282:33
7:24
+0:17
Finish
26.22 mi13:40:223:14:517:266:53
6:45
-0:39

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

6:45 /mi

Average Pace

7:26 /mi

Slowest Pace

7:55 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

42:01

22% of race

Time at Steady Pace

2:32:50

78% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:26 /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 mi10:48:4623:157:2923:15
7:29
#9512
10K
6.21 mi11:11:5746:267:2823:11
7:28
#9782
15K
9.32 mi11:35:041:09:337:2823:07
7:26
#9706
20K
12.43 mi11:58:161:32:457:2823:12
7:28
#9527
Half
13.11 mi12:03:191:37:487:285:03
7:24
#9519
25K
15.53 mi12:21:251:55:547:2818:06
7:28
#9322
30K
18.64 mi12:45:062:19:357:2923:41
7:37
#9071
20M
20.00 mi12:55:292:29:587:3010:23
7:38
#8940
21M
21.00 mi13:03:242:37:537:317:55
7:55
#8799
35K
21.75 mi13:08:472:43:167:305:23
7:12
#8691
23M
23.00 mi13:17:512:52:207:309:04
7:14
#8407
24M
24.00 mi13:24:512:59:207:287:00
7:00
#8182
40K
24.85 mi13:30:563:05:257:286:05
7:07
#7983
25.2M
25.20 mi13:33:293:07:587:282:33
7:24
#7898
Finish
26.22 mi13:40:223:14:517:266:53
6:45
#7699
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi9512162716279709(Top 36%)1715(Top 15%)1715(Top 35%)
10K6.21 mi3.10 mi9782-2701739-1121739-11210181(Top 38%)1908(Top 17%)1908(Top 39%)
15K9.32 mi3.11 mi9706+761713+261713+269709(Top 36%)1715(Top 15%)1715(Top 35%)
20K12.43 mi3.11 mi9527+1791642+711642+719079(Top 34%)1528(Top 13%)1528(Top 31%)
Half13.11 mi0.68 mi9519+81640+21640+29523(Top 36%)1701(Top 15%)1701(Top 35%)
25K15.53 mi2.42 mi9322+1971572+681572+688544(Top 32%)1373(Top 12%)1373(Top 28%)
30K18.64 mi3.11 mi9071+2511515+571515+578134(Top 31%)1364(Top 12%)1364(Top 28%)
20M20.00 mi1.36 mi8940+1311481+341481+347796(Top 29%)1332(Top 12%)1332(Top 27%)
21M21.00 mi1.00 mi8799+1411442+391442+396879(Top 26%)1097(Top 10%)1097(Top 22%)
35K21.75 mi0.75 mi8691+1081421+211421+216565(Top 25%)955(Top 8%)955(Top 20%)
23M23.00 mi1.25 mi8407+2841332+891332+895033(Top 19%)547(Top 5%)547(Top 11%)
24M24.00 mi1.00 mi8182+2251273+591273+594717(Top 18%)505(Top 4%)505(Top 10%)
40K24.85 mi0.85 mi7983+1991215+581215+584490(Top 17%)515(Top 5%)515(Top 11%)
25.2M25.20 mi0.35 mi7898+851191+241191+243509(Top 13%)367(Top 3%)367(Top 8%)
Finish26.22 mi1.02 mi7699+1991143+481143+483851(Top 14%)441(Top 4%)441(Top 9%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 36%
×21stories
+97ft-345ft

Overall

9709

Females

1715

F18-39

1715

5K→10K

3.1 - 6.2 mi

Top 38%
×5stories
+79ft-138ft

Overall

10181

Females

1908

F18-39

1908

10K→15K

6.2 - 9.3 mi

Top 36%
×3stories
+67ft-78ft

Overall

9709

Females

1715

F18-39

1715

15K→20K

9.3 - 12.4 mi

Top 34%
×5stories
+106ft-86ft

Overall

9079

Females

1528

F18-39

1528

20K→Half

12.4 - 13.1 mi

Top 36%
×2stories
+19ft-37ft

Overall

9523

Females

1701

F18-39

1701

Half→25K

13.1 - 15.5 mi

Top 32%
×4stories
+66ft-88ft

Overall

8544

Females

1373

F18-39

1373

25K→30K

15.5 - 18.6 mi

Top 31%
×9stories
+181ft-148ft

Overall

8134

Females

1364

F18-39

1364

30K→20M

18.6 - 20.0 mi

Top 29%
×5stories
+64ft-50ft

Overall

7796

Females

1332

F18-39

1332

20M→21M

20.0 - 21.0 mi

Top 26%
×8stories
+106ft-24ft

Overall

6879

Females

1097

F18-39

1097

21M→35K

21.0 - 21.8 mi

Top 25%
×7stories
+17ft-86ft

Overall

6565

Females

955

F18-39

955

35K→23M

21.8 - 23.0 mi

Top 19%
×5stories
+23ft-63ft

Overall

5033

Females

547

F18-39

547

23M→24M

23.0 - 24.0 mi

Top 18%
×6stories
+12ft-82ft

Overall

4717

Females

505

F18-39

505

24M→40K

24.0 - 24.9 mi

Top 17%
×1story
+6ft-20ft

Overall

4490

Females

515

F18-39

515

40K→25.2M

24.9 - 25.2 mi

Top 13%
×1story
+13ft-16ft

Overall

3509

Females

367

F18-39

367

25.2M→Finish

25.2 - 26.2 mi

Top 14%
×2stories
+22ft-21ft

Overall

3851

Females

441

F18-39

441

Passing Analysis

Category:
Athletes Passed
2617*
Passed By
804
Net Change
+1813
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#9512
5K → 10K192462-270#9512#9782
10K → 15K210134+76#9782#9706
15K → 20K23859+179#9706#9527
20K → Half2921+8#9527#9519
Half → 25K22528+197#9519#9322
25K → 30K295*44+251#9322#9071
30K → 20M15928+131#9071#8940
20M → 21M15918+141#8940#8799
21M → 35K1102+108#8799#8691
35K → 23M2840+284#8691#8407
23M → 24M2261+225#8407#8182
24M → 40K2012+199#8182#7983
40K → 25.2M861+85#7983#7898
25.2M → Finish2034+199#7898#7699
TOTALS2617*804+1813

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

📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

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
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing