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BOSTON MARATHON 2025

Shaorong Chang

Bib: 20004•F

TX

Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Age Group (F45-49)
#0 / 1813
Race Day Weather
50°/40°F
broken 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· 3.11 mi
25:36
Rank: #18345
Start → 5K
25:36 | 8:14/mi
10K· 6.21 mi
50:59
Rank: #18008 (+337)
5K → 10K
25:23 | 8:10/mi
15K· 9.32 mi
1:37:12
Rank: #26144 (-8136)
10K → 15K
46:13 | 14:53/mi
20K· 12.43 mi
2:30:50
Rank: #27906 (-1762)
15K → 20K
53:38 | 17:16/mi
Half· 13.11 mi
2:38:34
Rank: #27874 (+32)
20K → Half
7:44 | 11:20/mi
25K· 15.53 mi
3:05:53
Rank: #27566 (+308)
Half → 25K
27:19 | 11:16/mi
30K· 18.64 mi
3:39:38
Rank: #27088 (+478)
25K → 30K
33:45 | 10:52/mi
20M
3:53:40
Rank: #26879 (+209)
30K → 20M
14:02 | 10:20/mi
21M
4:04:14
Rank: #26649 (+230)
20M → 21M
10:34 | 10:34/mi
35K· 21.75 mi
4:11:14
Rank: #26496 (+153)
21M → 35K
7:00 | 9:21/mi
23M
4:23:23
Rank: #26263 (+233)
35K → 23M
12:09 | 9:42/mi
24M
4:32:26
Rank: #26075 (+188)
23M → 24M
9:03 | 9:03/mi
40K· 24.85 mi
4:40:08
Rank: #25906 (+169)
24M → 40K
7:42 | 9:00/mi
25.2M
4:43:27
Rank: #25825 (+81)
40K → 25.2M
3:19 | 9:37/mi
Finish· 26.22 mi
4:52:14
Rank: #25667 (+158)
25.2M → Finish
8:47 | 8:37/mi
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Splits & Pacing

Detailed breakdown of your race performance at each timing point

Half Splits

1st Half
via Half
Distance13.11 mi
Time2:38:34
Pace12:06 /mi
2nd Half✓ Faster
Distance13.11 mi
Time2:13:40
Pace10:12 /mi
📊Negative Split: 15.7% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:22:4925:368:1425:36
8:14
-
10K
6.21 mi11:48:1250:598:1225:23
8:10
-0:04
15K
9.32 mi12:34:251:37:1210:2646:13
14:53
+6:43
20K
12.43 mi13:28:032:30:5012:0853:38
17:16
+2:23
Half
13.11 mi13:35:472:38:3412:067:44
11:20
-5:56
25K
15.53 mi14:03:063:05:5311:5827:19
11:16
-0:04
30K
18.64 mi14:36:513:39:3811:4733:45
10:52
-0:24
20M
20.00 mi14:50:533:53:4011:4114:02
10:20
-0:32
21M
21.00 mi15:01:274:04:1411:3810:34
10:34
+0:14
35K
21.75 mi15:08:274:11:1411:337:00
9:21
-1:13
23M
23.00 mi15:20:364:23:2311:2712:09
9:42
+0:21
24M
24.00 mi15:29:394:32:2611:219:03
9:03
-0:39
40K
24.85 mi15:37:214:40:0811:167:42
9:00
-0:03
25.2M
25.20 mi15:40:404:43:2711:153:19
9:37
+0:37
Finish
26.22 mi15:49:274:52:1411:098:47
8:37
-1:00

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

8:10 /mi

Average Pace

11:09 /mi

Slowest Pace

17:16 /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

50:59

17% of race

Time at Steady Pace

1:46:21

36% of race

Time at Slower Pace

2:14:54

46% of race

Average Pace: 11:09 /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 mi11:22:4925:368:1425:36
8:14
#18345
10K
6.21 mi11:48:1250:598:1225:23
8:10
#18008
15K
9.32 mi12:34:251:37:1210:2646:13
14:53
#26144
20K
12.43 mi13:28:032:30:5012:0853:38
17:16
#27906
Half
13.11 mi13:35:472:38:3412:067:44
11:20
#27874
25K
15.53 mi14:03:063:05:5311:5827:19
11:16
#27566
30K
18.64 mi14:36:513:39:3811:4733:45
10:52
#27088
20M
20.00 mi14:50:533:53:4011:4114:02
10:20
#26879
21M
21.00 mi15:01:274:04:1411:3810:34
10:34
#26649
35K
21.75 mi15:08:274:11:1411:337:00
9:21
#26496
23M
23.00 mi15:20:364:23:2311:2712:09
9:42
#26263
24M
24.00 mi15:29:394:32:2611:219:03
9:03
#26075
40K
24.85 mi15:37:214:40:0811:167:42
9:00
#25906
25.2M
25.20 mi15:40:404:43:2711:153:19
9:37
#25825
Finish
26.22 mi15:49:274:52:1411:098:47
8:37
#25667
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 mi183456555655528384(Top 100%)12222(Top 100%)12222(Top 674%)
10K6.21 mi3.10 mi18008+3376335+2206335+22017675(Top 62%)6107(Top 50%)6107(Top 337%)
15K9.32 mi3.11 mi26144-813610860-452510860-452528384(Top 100%)12222(Top 100%)12222(Top 674%)
20K12.43 mi3.11 mi27906-176211915-105511915-105528397(Top 100%)12226(Top 100%)12226(Top 674%)
Half13.11 mi0.68 mi27874+3211894+2111894+2126887(Top 95%)11346(Top 93%)11346(Top 626%)
25K15.53 mi2.42 mi27566+30811716+17811716+17825570(Top 90%)10615(Top 87%)10615(Top 585%)
30K18.64 mi3.11 mi27088+47811449+26711449+26723731(Top 84%)9722(Top 80%)9722(Top 536%)
20M20.00 mi1.36 mi26879+20911337+11211337+11221926(Top 77%)8852(Top 72%)8852(Top 488%)
21M21.00 mi1.00 mi26649+23011210+12711210+12720197(Top 71%)8024(Top 66%)8024(Top 443%)
35K21.75 mi0.75 mi26496+15311134+7611134+7619757(Top 70%)7864(Top 64%)7864(Top 434%)
23M23.00 mi1.25 mi26263+23311017+11711017+11719430(Top 68%)7751(Top 63%)7751(Top 428%)
24M24.00 mi1.00 mi26075+18810912+10510912+10517582(Top 62%)6818(Top 56%)6818(Top 376%)
40K24.85 mi0.85 mi25906+16910828+8410828+8416278(Top 57%)6210(Top 51%)6210(Top 343%)
25.2M25.20 mi0.35 mi25825+8110800+2810800+2815067(Top 53%)5614(Top 46%)5614(Top 310%)
Finish26.22 mi1.02 mi25667+15810730+7010730+7016907(Top 60%)6529(Top 53%)6529(Top 360%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 100%
×21stories
+97ft-345ft

Overall

28384

Females

12222

F45-49

12222

5K→10K

3.1 - 6.2 mi

Top 62%
×5stories
+79ft-138ft

Overall

17675

Females

6107

F45-49

6107

10K→15K

6.2 - 9.3 mi

Top 100%
×3stories
+67ft-78ft

Overall

28384

Females

12222

F45-49

12222

15K→20K

9.3 - 12.4 mi

Top 100%
×5stories
+106ft-86ft

Overall

28397

Females

12226

F45-49

12226

20K→Half

12.4 - 13.1 mi

Top 95%
×2stories
+19ft-37ft

Overall

26887

Females

11346

F45-49

11346

Half→25K

13.1 - 15.5 mi

Top 90%
×4stories
+66ft-88ft

Overall

25570

Females

10615

F45-49

10615

25K→30K

15.5 - 18.6 mi

Top 84%
×9stories
+181ft-148ft

Overall

23731

Females

9722

F45-49

9722

30K→20M

18.6 - 20.0 mi

Top 77%
×5stories
+64ft-50ft

Overall

21926

Females

8852

F45-49

8852

20M→21M

20.0 - 21.0 mi

Top 71%
×8stories
+106ft-24ft

Overall

20197

Females

8024

F45-49

8024

21M→35K

21.0 - 21.8 mi

Top 70%
×7stories
+17ft-86ft

Overall

19757

Females

7864

F45-49

7864

35K→23M

21.8 - 23.0 mi

Top 68%
×5stories
+23ft-63ft

Overall

19430

Females

7751

F45-49

7751

23M→24M

23.0 - 24.0 mi

Top 62%
×6stories
+12ft-82ft

Overall

17582

Females

6818

F45-49

6818

24M→40K

24.0 - 24.9 mi

Top 57%
×1story
+6ft-20ft

Overall

16278

Females

6210

F45-49

6210

40K→25.2M

24.9 - 25.2 mi

Top 53%
×1story
+13ft-16ft

Overall

15067

Females

5614

F45-49

5614

25.2M→Finish

25.2 - 26.2 mi

Top 60%
×2stories
+22ft-21ft

Overall

16907

Females

6529

F45-49

6529

Passing

Athletes you passed and who passed you throughout the race

Passing Analysis

Category:
Athletes Passed
2716
Passed By
10038
Net Change
-7322
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18345
5K → 10K475138+337#18345#18008
10K → 15K08136-8136#18008#26144
15K → 20K01762-1762#26144#27906
20K → Half331+32#27906#27874
Half → 25K3080+308#27874#27566
25K → 30K4791+478#27566#27088
30K → 20M2090+209#27088#26879
20M → 21M2300+230#26879#26649
21M → 35K1530+153#26649#26496
35K → 23M2330+233#26496#26263
23M → 24M1880+188#26263#26075
24M → 40K1690+169#26075#25906
40K → 25.2M810+81#25906#25825
25.2M → Finish1580+158#25825#25667
TOTALS271610038-7322
📊

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