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BOSTON MARATHON 2025

Stacy Ndiwa

Bib: 122 F KE

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 0.3%
Gender (Female)
#0 / 12228
Top 0.1%
Division (F18-39)
#0 / 5469
Top 0.2%
Race Day Weather
50°/40°F
broken clouds

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
5:25/mi
16:51
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
5:09/mi
32:52
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
5:15/mi
49:11
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
5:23/mi
1:05:53
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
5:28/mi
1:09:37
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
5:29/mi
1:22:55
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
5:36/mi
1:40:18
↑ 181↓ 1480.2%
138 ft elev
20M
5:41/mi
1:48:02
↑ 64↓ 500.2%
148 ft elev
21M
6:01/mi
1:54:03
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
5:30/mi
1:58:10
↑ 17↓ 861.7%
156 ft elev
23M
5:40/mi
2:05:16
↑ 23↓ 630.6%
116 ft elev
24M
5:34/mi
2:10:50
↓ 821.3%
34 ft elev
40K· 24.85 mi
5:39/mi
2:15:40
↓ 200.3%
20 ft elev
25.2M
6:14/mi
2:17:49
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
5:34/mi
2:23:29
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:09:375:19 /mi⚡ faster
2nd Half
1:13:525:38 /mi+6.1%
Positive split — 6.1% slower in the second half
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Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointTimeAvg PaceSegment LengthSegment TimeSegment PaceTrendDiff
5K
16:515:253.11 mi16:51
5:25
-
10K
32:525:173.10 mi16:01
5:09
-0:16
15K
49:115:173.11 mi16:19
5:15
+0:06
20K
1:05:535:183.11 mi16:42
5:23
+0:08
Half(13.11 mi)
1:09:375:190.68 mi3:44
5:28
+0:05
25K
1:22:555:202.42 mi13:18
5:29
+0:01
30K
1:40:185:233.11 mi17:23
5:36
+0:07
20M
1:48:025:241.36 mi7:44
5:41
+0:05
21M
1:54:035:261.00 mi6:01
6:01
+0:20
35K
1:58:105:260.75 mi4:07
5:30
-0:31
23M
2:05:165:271.25 mi7:06
5:40
+0:10
24M
2:10:505:271.00 mi5:34
5:34
-0:06
40K
2:15:405:280.85 mi4:50
5:39
+0:05
25.2M
2:17:495:280.35 mi2:09
6:14
+0:35
Finish(26.22 mi)
2:23:295:291.02 mi5:40
5:34
-0:40
Trend:
Faster pace
Steady pace
Slower pace

Checkpoints & Pacing

Pace Line

Fastest Pace

5:09 /mi

Average Pace

5:29 /mi

Slowest Pace

6:14 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Time at Faster Pace

1:05:53

46% of race

Time at Steady Pace

1:09:26

48% of race

Time at Slower Pace

8:10

6% of race

Average Pace: 5:28 /mi

Loading chart...
Faster pace (< avg)
Steady pace (≈ avg)
Slower pace (> avg)

Heatmap

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0mi6.6mi13.1mi19.7mi26.2mi
Pace:
Faster
Steady
Slower

Checkpoint and Segment Rankings

CheckpointSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi15517175299
10K3.10 mi74+8112+512+55188
15K3.11 mi71+313-113-15299
20K3.11 mi67+48+58+57866
Half(13.11 mi)0.68 mi75-813-513-51791919
25K2.42 mi81-614-114-11181212
30K3.11 mi79+210+410+411199
20M1.36 mi79101012299
21M1.00 mi77+27+37+314199
35K0.75 mi779-29-21211212
23M1.25 mi76+18+18+110677
24M1.00 mi77-19-19-111377
40K0.85 mi779911477
25.2M0.35 mi79-2991981010
Finish(26.22 mi)1.02 mi78+1991981111

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 0.2%
×21story building
+97ft-345ft

Overall

52

Females

9

F18-39

9

5K→10K

3.1 - 6.2 mi

Top 0.2%
×5story building
+79ft-138ft

Overall

51

Females

8

F18-39

8

10K→15K

6.2 - 9.3 mi

Top 0.2%
×3story building
+67ft-78ft

Overall

52

Females

9

F18-39

9

15K→20K

9.3 - 12.4 mi

Top 0.3%
×5story building
+106ft-86ft

Overall

78

Females

6

F18-39

6

20K→Half

12.4 - 13.1 mi

Top 0.6%
×2story building
+19ft-37ft

Overall

179

Females

19

F18-39

19

Half→25K

13.1 - 15.5 mi

Top 0.4%
×4story building
+66ft-88ft

Overall

118

Females

12

F18-39

12

25K→30K

15.5 - 18.6 mi

Top 0.4%
×9story building
+181ft-148ft

Overall

111

Females

9

F18-39

9

30K→20M

18.6 - 20.0 mi

Top 0.4%
×5story building
+64ft-50ft

Overall

122

Females

9

F18-39

9

20M→21M

20.0 - 21.0 mi

Top 0.5%
×8story building
+106ft-24ft

Overall

141

Females

9

F18-39

9

21M→35K

21.0 - 21.8 mi

Top 0.4%
×7story building
+17ft-86ft

Overall

121

Females

12

F18-39

12

35K→23M

21.8 - 23.0 mi

Top 0.4%
×5story building
+23ft-63ft

Overall

106

Females

7

F18-39

7

23M→24M

23.0 - 24.0 mi

Top 0.4%
×6story building
+12ft-82ft

Overall

113

Females

7

F18-39

7

24M→40K

24.0 - 24.9 mi

Top 0.4%
×1story
+6ft-20ft

Overall

114

Females

7

F18-39

7

40K→25.2M

24.9 - 25.2 mi

Top 0.7%
×1story
+13ft-16ft

Overall

198

Females

10

F18-39

10

25.2M→Finish

25.2 - 26.2 mi

Top 0.7%
×2story building
+22ft-21ft

Overall

198

Females

11

F18-39

11

Passing Analysis

Category:
Passed
110
Passed By
33
Net Change
+77
SegmentPassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#155
5K → 10K810+81#155#74
10K → 15K41+3#74#71
15K → 20K84+4#71#67
20K → Half08-8#67#75
Half → 25K06-6#75#81
25K → 30K53+2#81#79
30K → 20M000#79#79
20M → 21M42+2#79#77
21M → 35K220#77#77
35K → 23M21+1#77#76
23M → 24M23-1#76#77
24M → 40K110#77#77
40K → 25.2M02-2#77#79
25.2M → Finish10+1#79#78
TOTALS11033+77

Passing Charts

Category:
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Passing Circle

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Position Flow

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Race Lanes

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