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BOSTON MARATHON 2025

Chizuru Naito

Bib: 24170•F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F55-59)
#0 / 994
Top 49%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
27:40
Rank: #22019
Start → 5K
27:40 | 8:54/mi
10K· 6.21 mi
55:10
Rank: #21857 (+162)
5K → 10K
27:30 | 8:51/mi
15K· 9.32 mi
1:22:49
Rank: #21751 (+106)
10K → 15K
27:39 | 8:54/mi
20K· 12.43 mi
1:51:01
Rank: #21629 (+122)
15K → 20K
28:12 | 9:05/mi
Half· 13.11 mi
1:56:55
Rank: #21537 (+92)
20K → Half
5:54 | 8:39/mi
25K· 15.53 mi
2:18:57
Rank: #21318 (+219)
Half → 25K
22:02 | 9:05/mi
30K· 18.64 mi
2:48:53
Rank: #21146 (+172)
25K → 30K
29:56 | 9:38/mi
20M
3:02:14
Rank: #21085 (+61)
30K → 20M
13:21 | 9:49/mi
21M
3:12:32
Rank: #20968 (+117)
20M → 21M
10:18 | 10:18/mi
35K· 21.75 mi
3:19:41
Rank: #20952 (+16)
21M → 35K
7:09 | 9:33/mi
23M
3:31:55
Rank: #20891 (+61)
35K → 23M
12:14 | 9:46/mi
24M
3:41:33
Rank: #20874 (+17)
23M → 24M
9:38 | 9:38/mi
40K· 24.85 mi
3:49:48
Rank: #20800 (+74)
24M → 40K
8:15 | 9:39/mi
25.2M
3:53:27
Rank: #20775 (+25)
40K → 25.2M
3:39 | 10:35/mi
Finish· 26.22 mi
4:02:52
Rank: #20748 (+27)
25.2M → Finish
9:25 | 9:14/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:56:55
Pace8:55 /mi
2nd Half
Distance13.11 mi
Time2:05:57
Pace9:36 /mi
📊Positive Split: 7.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:25:3327:408:5427:40
8:54
-
10K
6.21 mi11:53:0355:108:5327:30
8:51
-0:03
15K
9.32 mi12:20:421:22:498:5327:39
8:54
+0:03
20K
12.43 mi12:48:541:51:018:5628:12
9:05
+0:11
Half
13.11 mi12:54:481:56:558:555:54
8:39
-0:26
25K
15.53 mi13:16:502:18:578:5722:02
9:05
+0:26
30K
18.64 mi13:46:462:48:539:0429:56
9:38
+0:33
20M
20.00 mi14:00:073:02:149:0713:21
9:49
+0:11
21M
21.00 mi14:10:253:12:329:1010:18
10:18
+0:29
35K
21.75 mi14:17:343:19:419:117:09
9:33
-0:45
23M
23.00 mi14:29:483:31:559:1312:14
9:46
+0:13
24M
24.00 mi14:39:263:41:339:149:38
9:38
-0:08
40K
24.85 mi14:47:413:49:489:158:15
9:39
+0:01
25.2M
25.20 mi14:51:203:53:279:163:39
10:35
+0:56
Finish
26.22 mi15:00:454:02:529:169:25
9:14
-1:21

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

8:39 /mi

Average Pace

9:16 /mi

Slowest Pace

10:35 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:28:22

61% of race

Time at Steady Pace

1:20:33

33% of race

Time at Slower Pace

13:57

6% of race

Average Pace: 9:16 /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 mi11:25:3327:408:5427:40
8:54
#22019
10K
6.21 mi11:53:0355:108:5327:30
8:51
#21857
15K
9.32 mi12:20:421:22:498:5327:39
8:54
#21751
20K
12.43 mi12:48:541:51:018:5628:12
9:05
#21629
Half
13.11 mi12:54:481:56:558:555:54
8:39
#21537
25K
15.53 mi13:16:502:18:578:5722:02
9:05
#21318
30K
18.64 mi13:46:462:48:539:0429:56
9:38
#21146
20M
20.00 mi14:00:073:02:149:0713:21
9:49
#21085
21M
21.00 mi14:10:253:12:329:1010:18
10:18
#20968
35K
21.75 mi14:17:343:19:419:117:09
9:33
#20952
23M
23.00 mi14:29:483:31:559:1312:14
9:46
#20891
24M
24.00 mi14:39:263:41:339:149:38
9:38
#20874
40K
24.85 mi14:47:413:49:489:158:15
9:39
#20800
25.2M
25.20 mi14:51:203:53:279:163:39
10:35
#20775
Finish
26.22 mi15:00:454:02:529:169:25
9:14
#20748
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF55-59Seg. OverallSeg. FemalesSeg. F55-59
5K3.11 mi3.11 mi220198634863421575(Top 76%)8317(Top 68%)8317(Top 837%)
10K6.21 mi3.10 mi21857+1628526+1088526+10821653(Top 76%)8399(Top 69%)8399(Top 845%)
15K9.32 mi3.11 mi21751+1068468+588468+5821575(Top 76%)8317(Top 68%)8317(Top 837%)
20K12.43 mi3.11 mi21629+1228397+718397+7121357(Top 75%)8235(Top 67%)8235(Top 828%)
Half13.11 mi0.68 mi21537+928339+588339+5820114(Top 71%)7554(Top 62%)7554(Top 760%)
25K15.53 mi2.42 mi21318+2198224+1158224+11520312(Top 72%)7707(Top 63%)7707(Top 775%)
30K18.64 mi3.11 mi21146+1728167+578167+5720501(Top 72%)7934(Top 65%)7934(Top 798%)
20M20.00 mi1.36 mi21085+618155+128155+1220382(Top 72%)8010(Top 66%)8010(Top 806%)
21M21.00 mi1.00 mi20968+1178103+528103+5219395(Top 68%)7555(Top 62%)7555(Top 760%)
35K21.75 mi0.75 mi20952+168105-28105-220542(Top 72%)8260(Top 68%)8260(Top 831%)
23M23.00 mi1.25 mi20891+618103+28103+219700(Top 69%)7889(Top 65%)7889(Top 794%)
24M24.00 mi1.00 mi20874+178113-108113-1020142(Top 71%)8156(Top 67%)8156(Top 821%)
40K24.85 mi0.85 mi20800+748086+278086+2719290(Top 68%)7781(Top 64%)7781(Top 783%)
25.2M25.20 mi0.35 mi20775+258086808619348(Top 68%)7836(Top 64%)7836(Top 788%)
Finish26.22 mi1.02 mi20748+278084+28084+220152(Top 71%)8230(Top 67%)8230(Top 828%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 76%
×21stories
+97ft-345ft

Overall

21575

Females

8317

F55-59

8317

5K→10K

3.1 - 6.2 mi

Top 76%
×5stories
+79ft-138ft

Overall

21653

Females

8399

F55-59

8399

10K→15K

6.2 - 9.3 mi

Top 76%
×3stories
+67ft-78ft

Overall

21575

Females

8317

F55-59

8317

15K→20K

9.3 - 12.4 mi

Top 75%
×5stories
+106ft-86ft

Overall

21357

Females

8235

F55-59

8235

20K→Half

12.4 - 13.1 mi

Top 71%
×2stories
+19ft-37ft

Overall

20114

Females

7554

F55-59

7554

Half→25K

13.1 - 15.5 mi

Top 72%
×4stories
+66ft-88ft

Overall

20312

Females

7707

F55-59

7707

25K→30K

15.5 - 18.6 mi

Top 72%
×9stories
+181ft-148ft

Overall

20501

Females

7934

F55-59

7934

30K→20M

18.6 - 20.0 mi

Top 72%
×5stories
+64ft-50ft

Overall

20382

Females

8010

F55-59

8010

20M→21M

20.0 - 21.0 mi

Top 68%
×8stories
+106ft-24ft

Overall

19395

Females

7555

F55-59

7555

21M→35K

21.0 - 21.8 mi

Top 72%
×7stories
+17ft-86ft

Overall

20542

Females

8260

F55-59

8260

35K→23M

21.8 - 23.0 mi

Top 69%
×5stories
+23ft-63ft

Overall

19700

Females

7889

F55-59

7889

23M→24M

23.0 - 24.0 mi

Top 71%
×6stories
+12ft-82ft

Overall

20142

Females

8156

F55-59

8156

24M→40K

24.0 - 24.9 mi

Top 68%
×1story
+6ft-20ft

Overall

19290

Females

7781

F55-59

7781

40K→25.2M

24.9 - 25.2 mi

Top 68%
×1story
+13ft-16ft

Overall

19348

Females

7836

F55-59

7836

25.2M→Finish

25.2 - 26.2 mi

Top 71%
×2stories
+22ft-21ft

Overall

20152

Females

8230

F55-59

8230

Passing Analysis

Category:
Athletes Passed
2205
Passed By
934
Net Change
+1271
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22019
5K → 10K349187+162#22019#21857
10K → 15K255149+106#21857#21751
15K → 20K256134+122#21751#21629
20K → Half942+92#21629#21537
Half → 25K26243+219#21537#21318
25K → 30K275103+172#21318#21146
30K → 20M13372+61#21146#21085
20M → 21M14730+117#21085#20968
21M → 35K6751+16#20968#20952
35K → 23M12059+61#20952#20891
23M → 24M6548+17#20891#20874
24M → 40K9016+74#20874#20800
40K → 25.2M4015+25#20800#20775
25.2M → Finish5225+27#20775#20748
TOTALS2205934+1271
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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