Boston Marathon logo
BOSTON MARATHON 2023

Jessica Isaac

Bib: 16110•F

ON

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 41%
Gender (Female)
#0 / 11423
Top 23%
Division (F18-39)
#0 / 4884
Top 39%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
24:14
Rank: #12348
Start → 5K
24:14 | 7:48/mi
10K· 6.21 mi
47:56
Rank: #11951 (+397)
5K → 10K
23:42 | 7:38/mi
15K· 9.32 mi
1:11:41
Rank: #11708 (+243)
10K → 15K
23:45 | 7:39/mi
20K· 12.43 mi
1:36:03
Rank: #11785 (-77)
15K → 20K
24:22 | 7:51/mi
Half· 13.11 mi
1:41:20
Rank: #11803 (-18)
20K → Half
5:17 | 7:45/mi
25K· 15.53 mi
2:00:24
Rank: #11730 (+73)
Half → 25K
19:04 | 7:52/mi
30K· 18.64 mi
2:25:21
Rank: #11589 (+141)
25K → 30K
24:57 | 8:02/mi
20M
2:36:31
Rank: #11591 (-2)
30K → 20M
11:10 | 8:13/mi
21M
2:44:44
Rank: #11371 (+220)
20M → 21M
8:13 | 8:13/mi
35K· 21.75 mi
2:50:29
Rank: #11307 (+64)
21M → 35K
5:45 | 7:41/mi
23M
3:00:27
Rank: #11171 (+136)
35K → 23M
9:58 | 7:58/mi
24M
3:08:23
Rank: #11155 (+16)
23M → 24M
7:56 | 7:56/mi
40K· 24.85 mi
3:15:14
Rank: #11074 (+81)
24M → 40K
6:51 | 8:01/mi
25.2M
3:18:10
Rank: #11037 (+37)
40K → 25.2M
2:56 | 8:30/mi
Finish· 26.22 mi
3:26:01
Rank: #10978 (+59)
25.2M → Finish
7:51 | 7:42/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 HalfFaster
Distance13.11 mi
Time1:41:20
Pace7:44 /mi
2nd Half
Distance13.11 mi
Time1:44:41
Pace7:59 /mi
📊Positive Split: 3.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:14:1724:147:4824:14
7:48
-
10K
6.21 mi11:37:5947:567:4323:42
7:38
-0:10
15K
9.32 mi12:01:441:11:417:4123:45
7:39
+0:01
20K
12.43 mi12:26:061:36:037:4424:22
7:51
+0:12
Half
13.11 mi12:31:231:41:207:445:17
7:45
-0:06
25K
15.53 mi12:50:272:00:247:4519:04
7:52
+0:07
30K
18.64 mi13:15:242:25:217:4824:57
8:02
+0:10
20M
20.00 mi13:26:342:36:317:5011:10
8:13
+0:11
21M
21.00 mi13:34:472:44:447:518:13
8:13
0:00
35K
21.75 mi13:40:322:50:297:505:45
7:41
-0:32
23M
23.00 mi13:50:303:00:277:519:58
7:58
+0:17
24M
24.00 mi13:58:263:08:237:517:56
7:56
-0:02
40K
24.85 mi14:05:173:15:147:516:51
8:01
+0:05
25.2M
25.20 mi14:08:133:18:107:522:56
8:30
+0:29
Finish
26.22 mi14:16:043:26:017:527:51
7:42
-0:48

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

7:38 /mi

Average Pace

7:52 /mi

Slowest Pace

8:30 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:23:05

99% of race

Time at Steady Pace

2:56

1% 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 mi11:14:1724:147:4824:14
7:48
#12348
10K
6.21 mi11:37:5947:567:4323:42
7:38
#11951
15K
9.32 mi12:01:441:11:417:4123:45
7:39
#11708
20K
12.43 mi12:26:061:36:037:4424:22
7:51
#11785
Half
13.11 mi12:31:231:41:207:445:17
7:45
#11803
25K
15.53 mi12:50:272:00:247:4519:04
7:52
#11730
30K
18.64 mi13:15:242:25:217:4824:57
8:02
#11589
20M
20.00 mi13:26:342:36:317:5011:10
8:13
#11591
21M
21.00 mi13:34:472:44:447:518:13
8:13
#11371
35K
21.75 mi13:40:322:50:297:505:45
7:41
#11307
23M
23.00 mi13:50:303:00:277:519:58
7:58
#11171
24M
24.00 mi13:58:263:08:237:517:56
7:56
#11155
40K
24.85 mi14:05:173:15:147:516:51
8:01
#11074
25.2M
25.20 mi14:08:133:18:107:522:56
8:30
#11037
Finish
26.22 mi14:16:043:26:017:527:51
7:42
#10978
Faster pace
Steady pace
Slower pace
Est.Checkpoint not recorded (estimated)
~Segment time uses estimated prior

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi123483067306711380(Top 43%)2556(Top 22%)2556(Top 52%)
10K6.21 mi3.10 mi11951+3972844+2232844+22311596(Top 44%)2651(Top 23%)2651(Top 54%)
15K9.32 mi3.11 mi11708+2432731+1132731+11311380(Top 43%)2556(Top 22%)2556(Top 52%)
20K12.43 mi3.11 mi11785-772791-602791-6012104(Top 45%)3027(Top 26%)3027(Top 62%)
Half13.11 mi0.68 mi11803-182797-62797-612258(Top 46%)3050(Top 27%)3050(Top 62%)
25K15.53 mi2.42 mi11730+732774+232774+2311649(Top 44%)2858(Top 25%)2858(Top 59%)
30K18.64 mi3.11 mi11589+1412741+332741+3311158(Top 42%)2717(Top 24%)2717(Top 56%)
20M20.00 mi1.36 mi11591-22764-232764-2311851(Top 45%)3197(Top 28%)3197(Top 65%)
21M21.00 mi1.00 mi11371+2202658+1062658+1068661(Top 33%)1786(Top 16%)1786(Top 37%)
35K21.75 mi0.75 mi11307+642632+262632+269881(Top 37%)2306(Top 20%)2306(Top 47%)
23M23.00 mi1.25 mi11171+1362587+452587+459511(Top 36%)2276(Top 20%)2276(Top 47%)
24M24.00 mi1.00 mi11155+162606-192606-1910795(Top 41%)2974(Top 26%)2974(Top 61%)
40K24.85 mi0.85 mi11074+812588+182588+1810160(Top 38%)2732(Top 24%)2732(Top 56%)
25.2M25.20 mi0.35 mi11037+372585+32585+39651(Top 36%)2534(Top 22%)2534(Top 52%)
Finish26.22 mi1.02 mi10978+592580+52580+510021(Top 38%)2708(Top 24%)2708(Top 55%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 43%
×21stories
+97ft-345ft

Overall

11380

Females

2556

F18-39

2556

5K→10K

3.1 - 6.2 mi

Top 44%
×5stories
+79ft-138ft

Overall

11596

Females

2651

F18-39

2651

10K→15K

6.2 - 9.3 mi

Top 43%
×3stories
+67ft-78ft

Overall

11380

Females

2556

F18-39

2556

15K→20K

9.3 - 12.4 mi

Top 45%
×5stories
+106ft-86ft

Overall

12104

Females

3027

F18-39

3027

20K→Half

12.4 - 13.1 mi

Top 46%
×2stories
+19ft-37ft

Overall

12258

Females

3050

F18-39

3050

Half→25K

13.1 - 15.5 mi

Top 44%
×4stories
+66ft-88ft

Overall

11649

Females

2858

F18-39

2858

25K→30K

15.5 - 18.6 mi

Top 42%
×9stories
+181ft-148ft

Overall

11158

Females

2717

F18-39

2717

30K→20M

18.6 - 20.0 mi

Top 45%
×5stories
+64ft-50ft

Overall

11851

Females

3197

F18-39

3197

20M→21M

20.0 - 21.0 mi

Top 33%
×8stories
+106ft-24ft

Overall

8661

Females

1786

F18-39

1786

21M→35K

21.0 - 21.8 mi

Top 37%
×7stories
+17ft-86ft

Overall

9881

Females

2306

F18-39

2306

35K→23M

21.8 - 23.0 mi

Top 36%
×5stories
+23ft-63ft

Overall

9511

Females

2276

F18-39

2276

23M→24M

23.0 - 24.0 mi

Top 41%
×6stories
+12ft-82ft

Overall

10795

Females

2974

F18-39

2974

24M→40K

24.0 - 24.9 mi

Top 38%
×1story
+6ft-20ft

Overall

10160

Females

2732

F18-39

2732

40K→25.2M

24.9 - 25.2 mi

Top 36%
×1story
+13ft-16ft

Overall

9651

Females

2534

F18-39

2534

25.2M→Finish

25.2 - 26.2 mi

Top 38%
×2stories
+22ft-21ft

Overall

10021

Females

2708

F18-39

2708

Passing Analysis

Category:
Athletes Passed
2359
Passed By
989
Net Change
+1370
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#12348
5K → 10K555158+397#12348#11951
10K → 15K33188+243#11951#11708
15K → 20K133210-77#11708#11785
20K → Half2341-18#11785#11803
Half → 25K17097+73#11803#11730
25K → 30K245104+141#11730#11589
30K → 20M9799-2#11589#11591
20M → 21M2299+220#11591#11371
21M → 35K8723+64#11371#11307
35K → 23M15721+136#11307#11171
23M → 24M8569+16#11171#11155
24M → 40K10221+81#11155#11074
40K → 25.2M469+37#11074#11037
25.2M → Finish9940+59#11037#10978
TOTALS2359989+1370
📊

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