Boston Marathon logo
BOSTON MARATHON 2025

Shanthi Lackey

Bib: 22639•F

CA

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Top 40%
Division (F45-49)
#0 / 1813
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
27:29
Rank: #21735
Start → 5K
27:29 | 8:51/mi
10K· 6.21 mi
53:22
Rank: #20336 (+1399)
5K → 10K
25:53 | 8:20/mi
15K· 9.32 mi
1:18:51
Rank: #19421 (+915)
10K → 15K
25:29 | 8:12/mi
20K· 12.43 mi
1:44:57
Rank: #18933 (+488)
15K → 20K
26:06 | 8:24/mi
Half· 13.11 mi
1:50:40
Rank: #18903 (+30)
20K → Half
5:43 | 8:23/mi
25K· 15.53 mi
2:11:08
Rank: #18541 (+362)
Half → 25K
20:28 | 8:26/mi
30K· 18.64 mi
2:38:18
Rank: #18056 (+485)
25K → 30K
27:10 | 8:45/mi
20M
2:50:29
Rank: #17930 (+126)
30K → 20M
12:11 | 8:58/mi
21M
2:59:51
Rank: #17781 (+149)
20M → 21M
9:22 | 9:22/mi
35K· 21.75 mi
3:06:17
Rank: #17702 (+79)
21M → 35K
6:26 | 8:36/mi
23M
3:17:19
Rank: #17536 (+166)
35K → 23M
11:02 | 8:49/mi
24M
3:26:06
Rank: #17465 (+71)
23M → 24M
8:47 | 8:47/mi
40K· 24.85 mi
3:33:46
Rank: #17413 (+52)
24M → 40K
7:40 | 8:58/mi
25.2M
3:37:03
Rank: #17369 (+44)
40K → 25.2M
3:17 | 9:31/mi
Finish· 26.22 mi
3:45:44
Rank: #17317 (+52)
25.2M → Finish
8:41 | 8:31/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
Time1:50:40
Pace8:26 /mi
2nd Half
Distance13.11 mi
Time1:55:04
Pace8:47 /mi
📊Positive Split: 4.0% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:23:5427:298:5127:29
8:51
-
10K
6.21 mi11:49:4753:228:3525:53
8:20
-0:31
15K
9.32 mi12:15:161:18:518:2825:29
8:12
-0:08
20K
12.43 mi12:41:221:44:578:2726:06
8:24
+0:12
Half
13.11 mi12:47:051:50:408:265:43
8:23
-0:01
25K
15.53 mi13:07:332:11:088:2620:28
8:26
+0:03
30K
18.64 mi13:34:432:38:188:3027:10
8:45
+0:19
20M
20.00 mi13:46:542:50:298:3112:11
8:58
+0:13
21M
21.00 mi13:56:162:59:518:349:22
9:22
+0:24
35K
21.75 mi14:02:423:06:178:346:26
8:36
-0:46
23M
23.00 mi14:13:443:17:198:3511:02
8:49
+0:13
24M
24.00 mi14:22:313:26:068:358:47
8:47
-0:02
40K
24.85 mi14:30:113:33:468:367:40
8:58
+0:11
25.2M
25.20 mi14:33:283:37:038:373:17
9:31
+0:33
Finish
26.22 mi14:42:093:45:448:378:41
8:31
-1:00

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

8:12 /mi

Average Pace

8:37 /mi

Slowest Pace

9:31 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:33:05

94% of race

Time at Steady Pace

12:39

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:37 /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 mi11:23:5427:298:5127:29
8:51
#21735
10K
6.21 mi11:49:4753:228:3525:53
8:20
#20336
15K
9.32 mi12:15:161:18:518:2825:29
8:12
#19421
20K
12.43 mi12:41:221:44:578:2726:06
8:24
#18933
Half
13.11 mi12:47:051:50:408:265:43
8:23
#18903
25K
15.53 mi13:07:332:11:088:2620:28
8:26
#18541
30K
18.64 mi13:34:432:38:188:3027:10
8:45
#18056
20M
20.00 mi13:46:542:50:298:3112:11
8:58
#17930
21M
21.00 mi13:56:162:59:518:349:22
9:22
#17781
35K
21.75 mi14:02:423:06:178:346:26
8:36
#17702
23M
23.00 mi14:13:443:17:198:3511:02
8:49
#17536
24M
24.00 mi14:22:313:26:068:358:47
8:47
#17465
40K
24.85 mi14:30:113:33:468:367:40
8:58
#17413
25.2M
25.20 mi14:33:283:37:038:373:17
9:31
#17369
Finish
26.22 mi14:42:093:45:448:378:41
8:31
#17317
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi217358475847517415(Top 61%)5964(Top 49%)5964(Top 329%)
10K6.21 mi3.10 mi20336+13997672+8037672+80318765(Top 66%)6743(Top 55%)6743(Top 372%)
15K9.32 mi3.11 mi19421+9157135+5377135+53717415(Top 61%)5964(Top 49%)5964(Top 329%)
20K12.43 mi3.11 mi18933+4886864+2716864+27117564(Top 62%)6086(Top 50%)6086(Top 336%)
Half13.11 mi0.68 mi18903+306850+146850+1418507(Top 65%)6621(Top 54%)6621(Top 365%)
25K15.53 mi2.42 mi18541+3626663+1876663+18716833(Top 59%)5760(Top 47%)5760(Top 318%)
30K18.64 mi3.11 mi18056+4856428+2356428+23516272(Top 57%)5620(Top 46%)5620(Top 310%)
20M20.00 mi1.36 mi17930+1266383+456383+4516633(Top 59%)5941(Top 49%)5941(Top 328%)
21M21.00 mi1.00 mi17781+1496313+706313+7015501(Top 55%)5459(Top 45%)5459(Top 301%)
35K21.75 mi0.75 mi17702+796288+256288+2516098(Top 57%)5841(Top 48%)5841(Top 322%)
23M23.00 mi1.25 mi17536+1666245+436245+4315203(Top 54%)5443(Top 45%)5443(Top 300%)
24M24.00 mi1.00 mi17465+716227+186227+1816252(Top 57%)6078(Top 50%)6078(Top 335%)
40K24.85 mi0.85 mi17413+526224+36224+316135(Top 57%)6116(Top 50%)6116(Top 337%)
25.2M25.20 mi0.35 mi17369+446209+156209+1514777(Top 52%)5447(Top 45%)5447(Top 300%)
Finish26.22 mi1.02 mi17317+526199+106199+1016378(Top 58%)6238(Top 51%)6238(Top 344%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 61%
×21stories
+97ft-345ft

Overall

17415

Females

5964

F45-49

5964

5K→10K

3.1 - 6.2 mi

Top 66%
×5stories
+79ft-138ft

Overall

18765

Females

6743

F45-49

6743

10K→15K

6.2 - 9.3 mi

Top 61%
×3stories
+67ft-78ft

Overall

17415

Females

5964

F45-49

5964

15K→20K

9.3 - 12.4 mi

Top 62%
×5stories
+106ft-86ft

Overall

17564

Females

6086

F45-49

6086

20K→Half

12.4 - 13.1 mi

Top 65%
×2stories
+19ft-37ft

Overall

18507

Females

6621

F45-49

6621

Half→25K

13.1 - 15.5 mi

Top 59%
×4stories
+66ft-88ft

Overall

16833

Females

5760

F45-49

5760

25K→30K

15.5 - 18.6 mi

Top 57%
×9stories
+181ft-148ft

Overall

16272

Females

5620

F45-49

5620

30K→20M

18.6 - 20.0 mi

Top 59%
×5stories
+64ft-50ft

Overall

16633

Females

5941

F45-49

5941

20M→21M

20.0 - 21.0 mi

Top 55%
×8stories
+106ft-24ft

Overall

15501

Females

5459

F45-49

5459

21M→35K

21.0 - 21.8 mi

Top 57%
×7stories
+17ft-86ft

Overall

16098

Females

5841

F45-49

5841

35K→23M

21.8 - 23.0 mi

Top 54%
×5stories
+23ft-63ft

Overall

15203

Females

5443

F45-49

5443

23M→24M

23.0 - 24.0 mi

Top 57%
×6stories
+12ft-82ft

Overall

16252

Females

6078

F45-49

6078

24M→40K

24.0 - 24.9 mi

Top 57%
×1story
+6ft-20ft

Overall

16135

Females

6116

F45-49

6116

40K→25.2M

24.9 - 25.2 mi

Top 52%
×1story
+13ft-16ft

Overall

14777

Females

5447

F45-49

5447

25.2M→Finish

25.2 - 26.2 mi

Top 58%
×2stories
+22ft-21ft

Overall

16378

Females

6238

F45-49

6238

Passing Analysis

Category:
Athletes Passed
4793
Passed By
375
Net Change
+4418
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21735
5K → 10K141112+1399#21735#20336
10K → 15K9194+915#20336#19421
15K → 20K51022+488#19421#18933
20K → Half4616+30#18933#18903
Half → 25K3708+362#18903#18541
25K → 30K52742+485#18541#18056
30K → 20M17751+126#18056#17930
20M → 21M18132+149#17930#17781
21M → 35K10122+79#17781#17702
35K → 23M20236+166#17702#17536
23M → 24M11140+71#17536#17465
24M → 40K9240+52#17465#17413
40K → 25.2M5511+44#17413#17369
25.2M → Finish9139+52#17369#17317
TOTALS4793375+4418
📊

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