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BOSTON MARATHON 2026

Sandra Chow

Bib: 23008•F

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0:00
0:00
/ mi
Masters
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Overall
#0 / 29021
Gender (Female)
#0 / 12578
Masters (Masters Women)
#0 / 6862
Age Group (F45-49)
#0 / 1786
Race Day Weather
51°/41°F
overcast clouds

Race Timeline and Course Information

Your journey through the course with elevation, pacing, and checkpoint details

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K
27:13
3.11 mi
Rank: #21502
Start → 5K
27:13 | 8:46/mi
10K
54:33
6.21 mi
Rank: #21734 (-232)
5K → 10K
27:20 | 8:48/mi
15K
1:22:07
9.32 mi
Rank: #21828 (-94)
10K → 15K
27:34 | 8:53/mi
20K
1:50:17
12.43 mi
Rank: #21904 (-76)
15K → 20K
28:10 | 9:04/mi
HALF
1:56:15
13.11 mi
Rank: #21880 (+24)
20K → HALF
5:58 | 8:46/mi
25K
2:19:24
15.53 mi
Rank: #22137 (-257)
HALF → 25K
23:09 | 9:33/mi
30K
2:51:59
18.64 mi
Rank: #22740 (-603)
25K → 30K
32:35 | 10:30/mi
20M
3:06:16
20.00 mi
Rank: #22832 (-92)
30K → 20M
14:17 | 10:31/mi
21M
3:17:50
21.00 mi
Rank: #22914 (-82)
20M → 21M
11:34 | 11:34/mi
35K
3:26:12
21.75 mi
Rank: #23050 (-136)
21M → 35K
8:22 | 11:12/mi
23M
3:39:13
23.00 mi
Rank: #23048 (+2)
35K → 23M
13:01 | 10:25/mi
24M
3:49:29
24.00 mi
Rank: #23063 (-15)
23M → 24M
10:16 | 10:16/mi
40K
3:58:53
24.85 mi
Rank: #23098 (-35)
24M → 40K
9:24 | 11:00/mi
25.2M
4:03:31
25.20 mi
Rank: #23178 (-80)
40K → 25.2M
4:38 | 13:27/mi
FINISH
4:14:59
26.22 mi
Rank: #23324 (-146)
25.2M → FINISH
11:28 | 11:16/mi

Splits & Pacing

Detailed breakdown of your race performance at each timing point

Half Splits

1st HalfFaster
via HALF
Distance13.11 mi
Time1:56:15
Pace8:53 /mi
2nd Half
Distance13.11 mi
Time2:18:44
Pace10:35 /mi
📊Positive Split: 19.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:30:4027:138:4627:13
8:46
-
10K
6.21 mi11:58:0054:338:4727:20
8:48
+0:02
15K
9.32 mi12:25:341:22:078:4927:34
8:53
+0:05
20K
12.43 mi12:53:441:50:178:5328:10
9:04
+0:11
HALF
13.11 mi12:59:421:56:158:535:58
8:46
-0:18
25K
15.53 mi13:22:512:19:248:5923:09
9:33
+0:47
30K
18.64 mi13:55:262:51:599:1432:35
10:30
+0:57
20M
20.00 mi14:09:433:06:169:1914:17
10:31
+0:01
21M
21.00 mi14:21:173:17:509:2611:34
11:34
+1:03
35K
21.75 mi14:29:393:26:129:298:22
11:12
-0:22
23M
23.00 mi14:42:403:39:139:3213:01
10:25
-0:47
24M
24.00 mi14:52:563:49:299:3410:16
10:16
-0:09
40K
24.85 mi15:02:203:58:539:379:24
11:00
+0:44
25.2M
25.20 mi15:06:584:03:319:404:38
13:27
+2:27
FINISH
26.22 mi15:18:264:14:599:4411:28
11:16
-2:11

Checkpoint Splits Visualizations

Explore your race data through different visual perspectives. Scroll to discover each visualization.

📈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

8:46 /mi

Average Pace

9:44 /mi

Slowest Pace

13:27 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Bar length shows time spent in each segment. Colors mark your faster to slower segments, relative to your own pace.

Time at Faster Pace

2:19:24

55% of race

Time at Steady Pace

1:19:33

31% of race

Time at Slower Pace

36:02

14% of race

Average Pace: 9:43 /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

Enhanced split table showing pace trends through mini sparkline visualizations.

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:30:4027:138:4627:13
8:46
#21502
10K
6.21 mi11:58:0054:338:4727:20
8:48
#21734
15K
9.32 mi12:25:341:22:078:4927:34
8:53
#21828
20K
12.43 mi12:53:441:50:178:5328:10
9:04
#21904
HALF
13.11 mi12:59:421:56:158:535:58
8:46
#21880
25K
15.53 mi13:22:512:19:248:5923:09
9:33
#22137
30K
18.64 mi13:55:262:51:599:1432:35
10:30
#22740
20M
20.00 mi14:09:433:06:169:1914:17
10:31
#22832
21M
21.00 mi14:21:173:17:509:2611:34
11:34
#22914
35K
21.75 mi14:29:393:26:129:298:22
11:12
#23050
23M
23.00 mi14:42:403:39:139:3213:01
10:25
#23048
24M
24.00 mi14:52:563:49:299:3410:16
10:16
#23063
40K
24.85 mi15:02:203:58:539:379:24
11:00
#23098
25.2M
25.20 mi15:06:584:03:319:404:38
13:27
#23178
FINISH
26.22 mi15:18:264:14:599:4411:28
11:16
#23324
Faster pace
Steady pace
Slower pace

Rankings

Your position at each checkpoint and how you ranked in each segment

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi215028454845422088(Top 76%)8682(Top 69%)8682(Top 486%)
10K6.21 mi3.10 mi21734-2328537-838537-8321913(Top 76%)8607(Top 68%)8607(Top 482%)
15K9.32 mi3.11 mi21828-948577-408577-4022088(Top 76%)8682(Top 69%)8682(Top 486%)
20K12.43 mi3.11 mi21904-768609-328609-3222228(Top 77%)8780(Top 70%)8780(Top 492%)
HALF13.11 mi0.68 mi21880+248596+138596+1321641(Top 75%)8466(Top 67%)8466(Top 474%)
25K15.53 mi2.42 mi22137-2578726-1308726-13023177(Top 80%)9289(Top 74%)9289(Top 520%)
30K18.64 mi3.11 mi22740-6039065-3399065-33924279(Top 84%)9990(Top 79%)9990(Top 559%)
20M20.00 mi1.36 mi22832-929133-689133-6823901(Top 82%)9853(Top 78%)9853(Top 552%)
21M21.00 mi1.00 mi22914-829194-619194-6124311(Top 84%)10150(Top 81%)10150(Top 568%)
35K21.75 mi0.75 mi23050-1369271-779271-7725569(Top 88%)10817(Top 86%)10817(Top 606%)
23M23.00 mi1.25 mi23048+29290-199290-1923154(Top 80%)9591(Top 76%)9591(Top 537%)
24M24.00 mi1.00 mi23063-159302-129302-1223531(Top 81%)9821(Top 78%)9821(Top 550%)
40K24.85 mi0.85 mi23098-359336-349336-3424252(Top 84%)10258(Top 82%)10258(Top 574%)
25.2M25.20 mi0.35 mi23178-809377-419377-4126611(Top 92%)11420(Top 91%)11420(Top 639%)
FINISH26.22 mi1.02 mi23324-1469457-809457-8026524(Top 91%)11403(Top 91%)11403(Top 638%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 76%
×21
+97ft-345ft

Overall

22088

Females

8682

F45-49

8682

5K→10K

3.1 - 6.2 mi

Top 76%
×5
+79ft-138ft

Overall

21913

Females

8607

F45-49

8607

10K→15K

6.2 - 9.3 mi

Top 76%
×3
+67ft-78ft

Overall

22088

Females

8682

F45-49

8682

15K→20K

9.3 - 12.4 mi

Top 77%
×5
+106ft-86ft

Overall

22228

Females

8780

F45-49

8780

20K→HALF

12.4 - 13.1 mi

Top 75%
×2
+19ft-37ft

Overall

21641

Females

8466

F45-49

8466

HALF→25K

13.1 - 15.5 mi

Top 80%
×4
+66ft-88ft

Overall

23177

Females

9289

F45-49

9289

25K→30K

15.5 - 18.6 mi

Top 84%
×9
+181ft-148ft

Overall

24279

Females

9990

F45-49

9990

30K→20M

18.6 - 20.0 mi

Top 82%
×5
+64ft-50ft

Overall

23901

Females

9853

F45-49

9853

20M→21M

20.0 - 21.0 mi

Top 84%
×8
+106ft-24ft

Overall

24311

Females

10150

F45-49

10150

21M→35K

21.0 - 21.8 mi

Top 88%
×7
+17ft-86ft

Overall

25569

Females

10817

F45-49

10817

35K→23M

21.8 - 23.0 mi

Top 80%
×5
+23ft-63ft

Overall

23154

Females

9591

F45-49

9591

23M→24M

23.0 - 24.0 mi

Top 81%
×6
+12ft-82ft

Overall

23531

Females

9821

F45-49

9821

24M→40K

24.0 - 24.9 mi

Top 84%
×1
+6ft-20ft

Overall

24252

Females

10258

F45-49

10258

40K→25.2M

24.9 - 25.2 mi

Top 92%
×1
+13ft-16ft

Overall

26611

Females

11420

F45-49

11420

25.2M→FINISH

25.2 - 26.2 mi

Top 91%
×2
+22ft-21ft

Overall

26524

Females

11403

F45-49

11403

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Passing

Athletes you passed and who passed you throughout the race

Passing Analysis

Category:
Athletes Passed
899
Passed By
2721
Net Change
-1822
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21502
5K → 10K189421-232#21502#21734
10K → 15K118212-94#21734#21828
15K → 20K147223-76#21828#21904
20K → HALF4420+24#21904#21880
HALF → 25K69326-257#21880#22137
25K → 30K57660-603#22137#22740
30K → 20M45137-92#22740#22832
20M → 21M54136-82#22832#22914
21M → 35K16152-136#22914#23050
35K → 23M6462+2#23050#23048
23M → 24M3853-15#23048#23063
24M → 40K4176-35#23063#23098
40K → 25.2M585-80#23098#23178
25.2M → FINISH12158-146#23178#23324
TOTALS8992721-1822

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📊

Passing Analysis Visualizations

Explore your passing analysis through 5 different visualizations. Scroll to discover each one.

Time:
Category:

📈Position Graph

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🎨Heatmap Timeline

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Activity Data

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing