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BOSTON MARATHON 2025

Chunzi Zhao

Bib: 19031•F

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

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
24:46
Rank: #16377
Start → 5K
24:46 | 7:58/mi
10K· 6.21 mi
50:11
Rank: #17095 (-718)
5K → 10K
25:25 | 8:11/mi
15K· 9.32 mi
1:16:15
Rank: #17643 (-548)
10K → 15K
26:04 | 8:23/mi
20K· 12.43 mi
1:43:21
Rank: #18103 (-460)
15K → 20K
27:06 | 8:43/mi
Half· 13.11 mi
1:49:15
Rank: #18197 (-94)
20K → Half
5:54 | 8:39/mi
25K· 15.53 mi
2:11:02
Rank: #18505 (-308)
Half → 25K
21:47 | 8:59/mi
30K· 18.64 mi
2:40:16
Rank: #18740 (-235)
25K → 30K
29:14 | 9:25/mi
20M
2:52:58
Rank: #18709 (+31)
30K → 20M
12:42 | 9:21/mi
21M
3:02:50
Rank: #18654 (+55)
20M → 21M
9:52 | 9:52/mi
35K· 21.75 mi
3:09:29
Rank: #18621 (+33)
21M → 35K
6:39 | 8:53/mi
23M
3:20:43
Rank: #18438 (+183)
35K → 23M
11:14 | 8:58/mi
24M
3:29:24
Rank: #18287 (+151)
23M → 24M
8:41 | 8:41/mi
40K· 24.85 mi
3:36:53
Rank: #18166 (+121)
24M → 40K
7:29 | 8:45/mi
25.2M
3:40:04
Rank: #18092 (+74)
40K → 25.2M
3:11 | 9:14/mi
Finish· 26.22 mi
3:48:34
Rank: #17975 (+117)
25.2M → Finish
8:30 | 8:20/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:49:15
Pace8:20 /mi
2nd Half
Distance13.11 mi
Time1:59:19
Pace9:06 /mi
📊Positive Split: 9.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:25:5124:467:5824:46
7:58
-
10K
6.21 mi11:51:1650:118:0525:25
8:11
+0:13
15K
9.32 mi12:17:201:16:158:1126:04
8:23
+0:12
20K
12.43 mi12:44:261:43:218:1927:06
8:43
+0:20
Half
13.11 mi12:50:201:49:158:205:54
8:39
-0:04
25K
15.53 mi13:12:072:11:028:2621:47
8:59
+0:20
30K
18.64 mi13:41:212:40:168:3629:14
9:25
+0:26
20M
20.00 mi13:54:032:52:588:3912:42
9:21
-0:04
21M
21.00 mi14:03:553:02:508:429:52
9:52
+0:31
35K
21.75 mi14:10:343:09:298:436:39
8:53
-0:59
23M
23.00 mi14:21:483:20:438:4411:14
8:58
+0:05
24M
24.00 mi14:30:293:29:248:448:41
8:41
-0:17
40K
24.85 mi14:37:583:36:538:447:29
8:45
+0:04
25.2M
25.20 mi14:41:093:40:048:443:11
9:14
+0:29
Finish
26.22 mi14:49:393:48:348:438:30
8:20
-0:54

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

7:58 /mi

Average Pace

8:43 /mi

Slowest Pace

9:52 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:24:45

37% of race

Time at Steady Pace

1:28:50

39% of race

Time at Slower Pace

54:59

24% of race

Average Pace: 8:43 /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

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:25:5124:467:5824:46
7:58
#16377
10K
6.21 mi11:51:1650:118:0525:25
8:11
#17095
15K
9.32 mi12:17:201:16:158:1126:04
8:23
#17643
20K
12.43 mi12:44:261:43:218:1927:06
8:43
#18103
Half
13.11 mi12:50:201:49:158:205:54
8:39
#18197
25K
15.53 mi13:12:072:11:028:2621:47
8:59
#18505
30K
18.64 mi13:41:212:40:168:3629:14
9:25
#18740
20M
20.00 mi13:54:032:52:588:3912:42
9:21
#18709
21M
21.00 mi14:03:553:02:508:429:52
9:52
#18654
35K
21.75 mi14:10:343:09:298:436:39
8:53
#18621
23M
23.00 mi14:21:483:20:438:4411:14
8:58
#18438
24M
24.00 mi14:30:293:29:248:448:41
8:41
#18287
40K
24.85 mi14:37:583:36:538:447:29
8:45
#18166
25.2M
25.20 mi14:41:093:40:048:443:11
9:14
#18092
Finish
26.22 mi14:49:393:48:348:438:30
8:20
#17975
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi163775379537918646(Top 66%)6692(Top 55%)6692(Top 122%)
10K6.21 mi3.10 mi17095-7185784-4055784-40517770(Top 63%)6163(Top 50%)6163(Top 113%)
15K9.32 mi3.11 mi17643-5486108-3246108-32418646(Top 66%)6692(Top 55%)6692(Top 122%)
20K12.43 mi3.11 mi18103-4606399-2916399-29119531(Top 69%)7217(Top 59%)7217(Top 132%)
Half13.11 mi0.68 mi18197-946458-596458-5920066(Top 71%)7506(Top 61%)7506(Top 137%)
25K15.53 mi2.42 mi18505-3086644-1866644-18619825(Top 70%)7427(Top 61%)7427(Top 136%)
30K18.64 mi3.11 mi18740-2356794-1506794-15019574(Top 69%)7433(Top 61%)7433(Top 136%)
20M20.00 mi1.36 mi18709+316807-136807-1318515(Top 65%)7008(Top 57%)7008(Top 128%)
21M21.00 mi1.00 mi18654+556806+16806+117787(Top 63%)6684(Top 55%)6684(Top 122%)
35K21.75 mi0.75 mi18621+336803+36803+317726(Top 62%)6750(Top 55%)6750(Top 123%)
23M23.00 mi1.25 mi18438+1836725+786725+7816126(Top 57%)5960(Top 49%)5960(Top 109%)
24M24.00 mi1.00 mi18287+1516674+516674+5115675(Top 55%)5741(Top 47%)5741(Top 105%)
40K24.85 mi0.85 mi18166+1216637+376637+3714959(Top 53%)5504(Top 45%)5504(Top 101%)
25.2M25.20 mi0.35 mi18092+746604+336604+3313221(Top 47%)4640(Top 38%)4640(Top 85%)
Finish26.22 mi1.02 mi17975+1176557+476557+4715230(Top 54%)5615(Top 46%)5615(Top 103%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 66%
×21stories
+97ft-345ft

Overall

18646

Females

6692

F18-39

6692

5K→10K

3.1 - 6.2 mi

Top 63%
×5stories
+79ft-138ft

Overall

17770

Females

6163

F18-39

6163

10K→15K

6.2 - 9.3 mi

Top 66%
×3stories
+67ft-78ft

Overall

18646

Females

6692

F18-39

6692

15K→20K

9.3 - 12.4 mi

Top 69%
×5stories
+106ft-86ft

Overall

19531

Females

7217

F18-39

7217

20K→Half

12.4 - 13.1 mi

Top 71%
×2stories
+19ft-37ft

Overall

20066

Females

7506

F18-39

7506

Half→25K

13.1 - 15.5 mi

Top 70%
×4stories
+66ft-88ft

Overall

19825

Females

7427

F18-39

7427

25K→30K

15.5 - 18.6 mi

Top 69%
×9stories
+181ft-148ft

Overall

19574

Females

7433

F18-39

7433

30K→20M

18.6 - 20.0 mi

Top 65%
×5stories
+64ft-50ft

Overall

18515

Females

7008

F18-39

7008

20M→21M

20.0 - 21.0 mi

Top 63%
×8stories
+106ft-24ft

Overall

17787

Females

6684

F18-39

6684

21M→35K

21.0 - 21.8 mi

Top 62%
×7stories
+17ft-86ft

Overall

17726

Females

6750

F18-39

6750

35K→23M

21.8 - 23.0 mi

Top 57%
×5stories
+23ft-63ft

Overall

16126

Females

5960

F18-39

5960

23M→24M

23.0 - 24.0 mi

Top 55%
×6stories
+12ft-82ft

Overall

15675

Females

5741

F18-39

5741

24M→40K

24.0 - 24.9 mi

Top 53%
×1story
+6ft-20ft

Overall

14959

Females

5504

F18-39

5504

40K→25.2M

24.9 - 25.2 mi

Top 47%
×1story
+13ft-16ft

Overall

13221

Females

4640

F18-39

4640

25.2M→Finish

25.2 - 26.2 mi

Top 54%
×2stories
+22ft-21ft

Overall

15230

Females

5615

F18-39

5615

Passing Analysis

Category:
Athletes Passed
1536
Passed By
3134
Net Change
-1598
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#16377
5K → 10K99817-718#16377#17095
10K → 15K67615-548#17095#17643
15K → 20K74534-460#17643#18103
20K → Half19113-94#18103#18197
Half → 25K82390-308#18197#18505
25K → 30K172407-235#18505#18740
30K → 20M11180+31#18740#18709
20M → 21M13075+55#18709#18654
21M → 35K7340+33#18654#18621
35K → 23M20017+183#18621#18438
23M → 24M16211+151#18438#18287
24M → 40K13110+121#18287#18166
40K → 25.2M773+74#18166#18092
25.2M → Finish13922+117#18092#17975
TOTALS15363134-1598
📊

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