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BOSTON MARATHON 2025

Sandra Do

Bib: 20493•F

ON

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Top 47%
Division (F40-44)
#0 / 1718
Race Day Weather
50°/40°F
broken clouds

⏱️ 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
8:35/mi
26:40
↑ 97↓ 3451.5%
10K· 6.21 mi
8:28/mi
52:58
↑ 79↓ 1380.4%
15K· 9.32 mi
8:25/mi
1:19:06
↑ 67↓ 78
20K· 12.43 mi
8:26/mi
1:45:19
↑ 106↓ 860.1%
Half· 13.11 mi
8:18/mi
1:50:59
↑ 19↓ 370.5%
25K· 15.53 mi
8:32/mi
2:11:41
↑ 66↓ 880.2%
30K· 18.64 mi
9:02/mi
2:39:45
↑ 181↓ 1480.2%
20M
9:16/mi
2:52:20
↑ 64↓ 500.2%
21M
10:01/mi
3:02:21
↑ 106↓ 241.6%
35K· 21.75 mi
8:59/mi
3:09:04
↑ 17↓ 861.7%
23M
9:12/mi
3:20:35
↑ 23↓ 630.6%
24M
9:00/mi
3:29:35
↓ 821.3%
40K· 24.85 mi
9:10/mi
3:37:25
↓ 200.3%
25.2M
10:26/mi
3:41:01
↑ 13↓ 160.2%
Finish· 26.22 mi
9:13/mi
3:50:25
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:50:59
Pace8:28 /mi
2nd Half
Distance13.11 mi
Time1:59:26
Pace9:07 /mi
📊Positive Split: 7.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:19:4726:408:3526:40
8:35
-
10K
6.21 mi11:46:0552:588:3126:18
8:28
-0:07
15K
9.32 mi12:12:131:19:068:2926:08
8:25
-0:03
20K
12.43 mi12:38:261:45:198:2826:13
8:26
+0:01
Half
13.11 mi12:44:061:50:598:285:40
8:18
-0:08
25K
15.53 mi13:04:482:11:418:2920:42
8:32
+0:14
30K
18.64 mi13:32:522:39:458:3428:04
9:02
+0:30
20M
20.00 mi13:45:272:52:208:3712:35
9:16
+0:14
21M
21.00 mi13:55:283:02:218:4110:01
10:01
+0:45
35K
21.75 mi14:02:113:09:048:426:43
8:59
-1:02
23M
23.00 mi14:13:423:20:358:4311:31
9:12
+0:13
24M
24.00 mi14:22:423:29:358:449:00
9:00
-0:12
40K
24.85 mi14:30:323:37:258:457:50
9:10
+0:10
25.2M
25.20 mi14:34:083:41:018:463:36
10:26
+1:16
Finish
26.22 mi14:43:323:50:258:489:24
9:13
-1:13

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

8:18 /mi

Average Pace

8:48 /mi

Slowest Pace

10:26 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:11:41

57% of race

Time at Steady Pace

1:25:07

37% of race

Time at Slower Pace

13:37

6% of race

Average Pace: 8:47 /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 mi11:19:4726:408:3526:40
8:35
#20367
10K
6.21 mi11:46:0552:588:3126:18
8:28
#19979
15K
9.32 mi12:12:131:19:068:2926:08
8:25
#19577
20K
12.43 mi12:38:261:45:198:2826:13
8:26
#19112
Half
13.11 mi12:44:061:50:598:285:40
8:18
#19038
25K
15.53 mi13:04:482:11:418:2920:42
8:32
#18776
30K
18.64 mi13:32:522:39:458:3428:04
9:02
#18575
20M
20.00 mi13:45:272:52:208:3712:35
9:16
#18532
21M
21.00 mi13:55:283:02:218:4110:01
10:01
#18516
35K
21.75 mi14:02:113:09:048:426:43
8:59
#18502
23M
23.00 mi14:13:423:20:358:4311:31
9:12
#18407
24M
24.00 mi14:22:423:29:358:449:00
9:00
#18346
40K
24.85 mi14:30:323:37:258:457:50
9:10
#18304
25.2M
25.20 mi14:34:083:41:018:463:36
10:26
#18322
Finish
26.22 mi14:43:323:50:258:489:24
9:13
#18414
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi203677725772518787(Top 66%)6777(Top 55%)6777(Top 394%)
10K6.21 mi3.10 mi19979+3887457+2687457+26819607(Top 69%)7240(Top 59%)7240(Top 421%)
15K9.32 mi3.11 mi19577+4027219+2387219+23818787(Top 66%)6777(Top 55%)6777(Top 394%)
20K12.43 mi3.11 mi19112+4656964+2556964+25517808(Top 63%)6232(Top 51%)6232(Top 363%)
Half13.11 mi0.68 mi19038+746928+366928+3618012(Top 63%)6329(Top 52%)6329(Top 368%)
25K15.53 mi2.42 mi18776+2626786+1426786+14217429(Top 61%)6104(Top 50%)6104(Top 355%)
30K18.64 mi3.11 mi18575+2016701+856701+8517863(Top 63%)6512(Top 53%)6512(Top 379%)
20M20.00 mi1.36 mi18532+436706-56706-518106(Top 64%)6775(Top 55%)6775(Top 394%)
21M21.00 mi1.00 mi18516+166732-266732-2618372(Top 65%)6990(Top 57%)6990(Top 407%)
35K21.75 mi0.75 mi18502+146738-66738-618146(Top 64%)6982(Top 57%)6982(Top 406%)
23M23.00 mi1.25 mi18407+956710+286710+2817334(Top 61%)6626(Top 54%)6626(Top 386%)
24M24.00 mi1.00 mi18346+616709+16709+117393(Top 61%)6706(Top 55%)6706(Top 390%)
40K24.85 mi0.85 mi18304+426713-46713-417193(Top 61%)6688(Top 55%)6688(Top 389%)
25.2M25.20 mi0.35 mi18322-186741-286741-2818821(Top 66%)7532(Top 62%)7532(Top 438%)
Finish26.22 mi1.02 mi18414-926815-746815-7420068(Top 71%)8183(Top 67%)8183(Top 476%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 66%
×21story building
+97ft-345ft

Overall

18787

Females

6777

F40-44

6777

5K→10K

3.1 - 6.2 mi

Top 69%
×5story building
+79ft-138ft

Overall

19607

Females

7240

F40-44

7240

10K→15K

6.2 - 9.3 mi

Top 66%
×3story building
+67ft-78ft

Overall

18787

Females

6777

F40-44

6777

15K→20K

9.3 - 12.4 mi

Top 63%
×5story building
+106ft-86ft

Overall

17808

Females

6232

F40-44

6232

20K→Half

12.4 - 13.1 mi

Top 63%
×2story building
+19ft-37ft

Overall

18012

Females

6329

F40-44

6329

Half→25K

13.1 - 15.5 mi

Top 61%
×4story building
+66ft-88ft

Overall

17429

Females

6104

F40-44

6104

25K→30K

15.5 - 18.6 mi

Top 63%
×9story building
+181ft-148ft

Overall

17863

Females

6512

F40-44

6512

30K→20M

18.6 - 20.0 mi

Top 64%
×5story building
+64ft-50ft

Overall

18106

Females

6775

F40-44

6775

20M→21M

20.0 - 21.0 mi

Top 65%
×8story building
+106ft-24ft

Overall

18372

Females

6990

F40-44

6990

21M→35K

21.0 - 21.8 mi

Top 64%
×7story building
+17ft-86ft

Overall

18146

Females

6982

F40-44

6982

35K→23M

21.8 - 23.0 mi

Top 61%
×5story building
+23ft-63ft

Overall

17334

Females

6626

F40-44

6626

23M→24M

23.0 - 24.0 mi

Top 61%
×6story building
+12ft-82ft

Overall

17393

Females

6706

F40-44

6706

24M→40K

24.0 - 24.9 mi

Top 61%
×1story
+6ft-20ft

Overall

17193

Females

6688

F40-44

6688

40K→25.2M

24.9 - 25.2 mi

Top 66%
×1story
+13ft-16ft

Overall

18821

Females

7532

F40-44

7532

25.2M→Finish

25.2 - 26.2 mi

Top 71%
×2story building
+22ft-21ft

Overall

20068

Females

8183

F40-44

8183

Passing Analysis

Category:
Athletes Passed
2875
Passed By
922
Net Change
+1953
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20367
5K → 10K535147+388#20367#19979
10K → 15K44947+402#19979#19577
15K → 20K48419+465#19577#19112
20K → Half8410+74#19112#19038
Half → 25K28927+262#19038#18776
25K → 30K340139+201#18776#18575
30K → 20M12986+43#18575#18532
20M → 21M11397+16#18532#18516
21M → 35K5844+14#18516#18502
35K → 23M15358+95#18502#18407
23M → 24M10342+61#18407#18346
24M → 40K8947+42#18346#18304
40K → 25.2M2442-18#18304#18322
25.2M → Finish25117-92#18322#18414
TOTALS2875922+1953
📊

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