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BOSTON MARATHON 2025

Sandra Heilbron

Bib: 28554•F

FL

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F50-54)
#0 / 1303
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K· 3.11 mi
26:53
Rank: #20775
Start → 5K
26:53 | 8:39/mi
10K· 6.21 mi
53:18
Rank: #20292 (+483)
5K → 10K
26:25 | 8:30/mi
15K· 9.32 mi
1:20:35
Rank: #20460 (-168)
10K → 15K
27:17 | 8:47/mi
20K· 12.43 mi
1:51:13
Rank: #21705 (-1245)
15K → 20K
30:38 | 9:52/mi
Half· 13.11 mi
1:57:59
Rank: #21925 (-220)
20K → Half
6:46 | 9:55/mi
25K· 15.53 mi
2:24:35
Rank: #22814 (-889)
Half → 25K
26:36 | 10:58/mi
30K· 18.64 mi
3:00:34
Rank: #23367 (-553)
25K → 30K
35:59 | 11:35/mi
20M
3:15:59
Rank: #23433 (-66)
30K → 20M
15:25 | 11:21/mi
21M
3:28:32
Rank: #23529 (-96)
20M → 21M
12:33 | 12:33/mi
35K· 21.75 mi
3:37:30
Rank: #23666 (-137)
21M → 35K
8:58 | 11:59/mi
23M
3:52:08
Rank: #23732 (-66)
35K → 23M
14:38 | 11:41/mi
24M
4:03:43
Rank: #23804 (-72)
23M → 24M
11:35 | 11:35/mi
40K· 24.85 mi
4:14:01
Rank: #23865 (-61)
24M → 40K
10:18 | 12:03/mi
25.2M
4:18:21
Rank: #23892 (-27)
40K → 25.2M
4:20 | 12:34/mi
Finish· 26.22 mi
4:29:49
Rank: #23998 (-106)
25.2M → Finish
11:28 | 11:15/mi

Course Map & Elevation

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:57:59
Pace9:00 /mi
2nd Half
Distance13.11 mi
Time2:31:50
Pace11:35 /mi
📊Positive Split: 28.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:43:4726:538:3926:53
8:39
-
10K
6.21 mi12:10:1253:188:3526:25
8:30
-0:09
15K
9.32 mi12:37:291:20:358:3927:17
8:47
+0:17
20K
12.43 mi13:08:071:51:138:5730:38
9:52
+1:05
Half
13.11 mi13:14:531:57:599:006:46
9:55
+0:03
25K
15.53 mi13:41:292:24:359:1826:36
10:58
+1:03
30K
18.64 mi14:17:283:00:349:4135:59
11:35
+0:37
20M
20.00 mi14:32:533:15:599:4815:25
11:21
-0:14
21M
21.00 mi14:45:263:28:329:5612:33
12:33
+1:12
35K
21.75 mi14:54:243:37:3010:008:58
11:59
-0:34
23M
23.00 mi15:09:023:52:0810:0614:38
11:41
-0:18
24M
24.00 mi15:20:374:03:4310:0911:35
11:35
-0:06
40K
24.85 mi15:30:554:14:0110:1310:18
12:03
+0:28
25.2M
25.20 mi15:35:154:18:2110:154:20
12:34
+0:31
Finish
26.22 mi15:46:434:29:4910:1811:28
11:15
-1:19

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

8:30 /mi

Average Pace

10:18 /mi

Slowest Pace

12:34 /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

1:57:59

44% of race

Time at Steady Pace

2:04:39

46% of race

Time at Slower Pace

27:11

10% of race

Average Pace: 10:17 /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 mi11:43:4726:538:3926:53
8:39
#20775
10K
6.21 mi12:10:1253:188:3526:25
8:30
#20292
15K
9.32 mi12:37:291:20:358:3927:17
8:47
#20460
20K
12.43 mi13:08:071:51:138:5730:38
9:52
#21705
Half
13.11 mi13:14:531:57:599:006:46
9:55
#21925
25K
15.53 mi13:41:292:24:359:1826:36
10:58
#22814
30K
18.64 mi14:17:283:00:349:4135:59
11:35
#23367
20M
20.00 mi14:32:533:15:599:4815:25
11:21
#23433
21M
21.00 mi14:45:263:28:329:5612:33
12:33
#23529
35K
21.75 mi14:54:243:37:3010:008:58
11:59
#23666
23M
23.00 mi15:09:023:52:0810:0614:38
11:41
#23732
24M
24.00 mi15:20:374:03:4310:0911:35
11:35
#23804
40K
24.85 mi15:30:554:14:0110:1310:18
12:03
#23865
25.2M
25.20 mi15:35:154:18:2110:154:20
12:34
#23892
Finish
26.22 mi15:46:434:29:4910:1811:28
11:15
#23998
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF50-54Seg. OverallSeg. FemalesSeg. F50-54
5K3.11 mi3.11 mi207757960796020950(Top 74%)7977(Top 65%)7977(Top 612%)
10K6.21 mi3.10 mi20292+4837646+3147646+31419831(Top 70%)7380(Top 60%)7380(Top 566%)
15K9.32 mi3.11 mi20460-1687732-867732-8620950(Top 74%)7977(Top 65%)7977(Top 612%)
20K12.43 mi3.11 mi21705-12458441-7098441-70923914(Top 84%)9659(Top 79%)9659(Top 741%)
Half13.11 mi0.68 mi21925-2208560-1198560-11924670(Top 87%)10092(Top 83%)10092(Top 775%)
25K15.53 mi2.42 mi22814-8899043-4839043-48325170(Top 89%)10387(Top 85%)10387(Top 797%)
30K18.64 mi3.11 mi23367-5539386-3439386-34324971(Top 88%)10394(Top 85%)10394(Top 798%)
20M20.00 mi1.36 mi23433-669436-509436-5024274(Top 85%)10096(Top 83%)10096(Top 775%)
21M21.00 mi1.00 mi23529-969515-799515-7924462(Top 86%)10272(Top 84%)10272(Top 788%)
35K21.75 mi0.75 mi23666-1379598-839598-8325846(Top 91%)11024(Top 90%)11024(Top 846%)
23M23.00 mi1.25 mi23732-669651-539651-5324586(Top 87%)10389(Top 85%)10389(Top 797%)
24M24.00 mi1.00 mi23804-729708-579708-5725043(Top 88%)10649(Top 87%)10649(Top 817%)
40K24.85 mi0.85 mi23865-619750-429750-4225010(Top 88%)10675(Top 87%)10675(Top 819%)
25.2M25.20 mi0.35 mi23892-279770-209770-2024354(Top 86%)10349(Top 85%)10349(Top 794%)
Finish26.22 mi1.02 mi23998-1069840-709840-7025805(Top 91%)11047(Top 90%)11047(Top 848%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 74%
×21stories
+97ft-345ft

Overall

20950

Females

7977

F50-54

7977

5K→10K

3.1 - 6.2 mi

Top 70%
×5stories
+79ft-138ft

Overall

19831

Females

7380

F50-54

7380

10K→15K

6.2 - 9.3 mi

Top 74%
×3stories
+67ft-78ft

Overall

20950

Females

7977

F50-54

7977

15K→20K

9.3 - 12.4 mi

Top 84%
×5stories
+106ft-86ft

Overall

23914

Females

9659

F50-54

9659

20K→Half

12.4 - 13.1 mi

Top 87%
×2stories
+19ft-37ft

Overall

24670

Females

10092

F50-54

10092

Half→25K

13.1 - 15.5 mi

Top 89%
×4stories
+66ft-88ft

Overall

25170

Females

10387

F50-54

10387

25K→30K

15.5 - 18.6 mi

Top 88%
×9stories
+181ft-148ft

Overall

24971

Females

10394

F50-54

10394

30K→20M

18.6 - 20.0 mi

Top 85%
×5stories
+64ft-50ft

Overall

24274

Females

10096

F50-54

10096

20M→21M

20.0 - 21.0 mi

Top 86%
×8stories
+106ft-24ft

Overall

24462

Females

10272

F50-54

10272

21M→35K

21.0 - 21.8 mi

Top 91%
×7stories
+17ft-86ft

Overall

25846

Females

11024

F50-54

11024

35K→23M

21.8 - 23.0 mi

Top 87%
×5stories
+23ft-63ft

Overall

24586

Females

10389

F50-54

10389

23M→24M

23.0 - 24.0 mi

Top 88%
×6stories
+12ft-82ft

Overall

25043

Females

10649

F50-54

10649

24M→40K

24.0 - 24.9 mi

Top 88%
×1story
+6ft-20ft

Overall

25010

Females

10675

F50-54

10675

40K→25.2M

24.9 - 25.2 mi

Top 86%
×1story
+13ft-16ft

Overall

24354

Females

10349

F50-54

10349

25.2M→Finish

25.2 - 26.2 mi

Top 91%
×2stories
+22ft-21ft

Overall

25805

Females

11047

F50-54

11047

Passing Analysis

Category:
Athletes Passed
1066
Passed By
4289
Net Change
-3223
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#20775
5K → 10K604121+483#20775#20292
10K → 15K130298-168#20292#20460
15K → 20K271272-1245#20460#21705
20K → Half8228-220#21705#21925
Half → 25K11900-889#21925#22814
25K → 30K44597-553#22814#23367
30K → 20M56122-66#23367#23433
20M → 21M51147-96#23433#23529
21M → 35K13150-137#23529#23666
35K → 23M48114-66#23666#23732
23M → 24M2092-72#23732#23804
24M → 40K2788-61#23804#23865
40K → 25.2M1239-27#23865#23892
25.2M → Finish15121-106#23892#23998
TOTALS10664289-3223
📊

Passing Visuals

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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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing