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BOSTON MARATHON 2023

Guangjing Chen

Bib: 21051•F

CA

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Masters (Masters Women)
#0 / 6539
Division (F45-49)
#0 / 1817
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
9:24/mi
29:12
↑ 97↓ 3451.5%
10K· 6.21 mi
9:26/mi
58:30
↑ 79↓ 1380.4%
15K· 9.32 mi
9:13/mi
1:27:09
↑ 67↓ 78
20K· 12.43 mi
9:06/mi
1:55:24
↑ 106↓ 860.1%
Half· 13.11 mi
8:39/mi
2:01:18
↑ 19↓ 370.5%
25K· 15.53 mi
8:58/mi
2:23:03
↑ 66↓ 880.2%
30K· 18.64 mi
9:06/mi
2:51:19
↑ 181↓ 1480.2%
20M
9:01/mi
3:03:34
↑ 64↓ 500.2%
21M
9:52/mi
3:13:26
↑ 106↓ 241.6%
35K· 21.75 mi
8:51/mi
3:20:03
↑ 17↓ 861.7%
23M
9:02/mi
3:31:21
↑ 23↓ 630.6%
24M
8:52/mi
3:40:13
↓ 821.3%
40K· 24.85 mi
8:54/mi
3:47:50
↓ 200.3%
25.2M
9:49/mi
3:51:13
↑ 13↓ 160.2%
Finish· 26.22 mi
8:30/mi
3:59:53
↑ 22↓ 21

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time2:01:18
Pace9:15 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:58:35
Pace9:03 /mi
📊Negative Split: 2.2% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:24:3229:129:2429:12
9:24
-
10K
6.21 mi11:53:5058:309:2529:18
9:26
+0:02
15K
9.32 mi12:22:291:27:099:2128:39
9:13
-0:13
20K
12.43 mi12:50:441:55:249:1728:15
9:06
-0:07
Half
13.11 mi12:56:382:01:189:155:54
8:39
-0:27
25K
15.53 mi13:18:232:23:039:1321:45
8:58
+0:19
30K
18.64 mi13:46:392:51:199:1128:16
9:06
+0:08
20M
20.00 mi13:58:543:03:349:1112:15
9:01
-0:05
21M
21.00 mi14:08:463:13:269:139:52
9:52
+0:51
35K
21.75 mi14:15:233:20:039:126:37
8:51
-1:01
23M
23.00 mi14:26:413:31:219:1111:18
9:02
+0:11
24M
24.00 mi14:35:333:40:139:118:52
8:52
-0:10
40K
24.85 mi14:43:103:47:509:107:37
8:54
+0:02
25.2M
25.20 mi14:46:333:51:139:113:23
9:49
+0:55
Finish
26.22 mi14:55:133:59:539:098:40
8:30
-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

9:09 /mi

Slowest Pace

9:52 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:48:08

70% of race

Time at Steady Pace

1:11:45

30% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 9:09 /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

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:24:3229:129:2429:12
9:24
#21814
10K
6.21 mi11:53:5058:309:2529:18
9:26
#22096
15K
9.32 mi12:22:291:27:099:2128:39
9:13
#21841
20K
12.43 mi12:50:441:55:249:1728:15
9:06
#21466
Half
13.11 mi12:56:382:01:189:155:54
8:39
#21359
25K
15.53 mi13:18:232:23:039:1321:45
8:58
#20963
30K
18.64 mi13:46:392:51:199:1128:16
9:06
#20417
20M
20.00 mi13:58:543:03:349:1112:15
9:01
#20174
21M
21.00 mi14:08:463:13:269:139:52
9:52
#19996
35K
21.75 mi14:15:233:20:039:126:37
8:51
#19901
23M
23.00 mi14:26:413:31:219:1111:18
9:02
#19702
24M
24.00 mi14:35:333:40:139:118:52
8:52
#19572
40K
24.85 mi14:43:103:47:509:107:37
8:54
#19449
25.2M
25.20 mi14:46:333:51:139:113:23
9:49
#19413
Finish
26.22 mi14:55:133:59:539:098:40
8:30
#19293
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi218148792879221389(Top 80%)8446(Top 74%)8446(Top 465%)
10K6.21 mi3.10 mi22096-2828903-1118903-11122315(Top 84%)8990(Top 79%)8990(Top 495%)
15K9.32 mi3.11 mi21841+2558749+1548749+15421389(Top 80%)8446(Top 74%)8446(Top 465%)
20K12.43 mi3.11 mi21466+3758537+2128537+21220123(Top 76%)7743(Top 68%)7743(Top 426%)
Half13.11 mi0.68 mi21359+1078467+708467+7018713(Top 70%)6923(Top 61%)6923(Top 381%)
25K15.53 mi2.42 mi20963+3968243+2248243+22418836(Top 71%)7038(Top 62%)7038(Top 387%)
30K18.64 mi3.11 mi20417+5467963+2807963+28017697(Top 66%)6468(Top 57%)6468(Top 356%)
20M20.00 mi1.36 mi20174+2437843+1207843+12016650(Top 63%)5952(Top 52%)5952(Top 328%)
21M21.00 mi1.00 mi19996+1787750+937750+9317539(Top 66%)6505(Top 57%)6505(Top 358%)
35K21.75 mi0.75 mi19901+957698+527698+5217238(Top 65%)6422(Top 56%)6422(Top 353%)
23M23.00 mi1.25 mi19702+1997585+1137585+11316208(Top 61%)5863(Top 51%)5863(Top 323%)
24M24.00 mi1.00 mi19572+1307523+627523+6216644(Top 63%)6174(Top 54%)6174(Top 340%)
40K24.85 mi0.85 mi19449+1237462+617462+6115704(Top 59%)5696(Top 50%)5696(Top 313%)
25.2M25.20 mi0.35 mi19413+367438+247438+2416708(Top 63%)6293(Top 55%)6293(Top 346%)
Finish26.22 mi1.02 mi19293+1207379+597379+5915511(Top 58%)5555(Top 49%)5555(Top 306%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 80%
×21story building
+97ft-345ft

Overall

21389

Females

8446

F45-49

8446

5K→10K

3.1 - 6.2 mi

Top 84%
×5story building
+79ft-138ft

Overall

22315

Females

8990

F45-49

8990

10K→15K

6.2 - 9.3 mi

Top 80%
×3story building
+67ft-78ft

Overall

21389

Females

8446

F45-49

8446

15K→20K

9.3 - 12.4 mi

Top 76%
×5story building
+106ft-86ft

Overall

20123

Females

7743

F45-49

7743

20K→Half

12.4 - 13.1 mi

Top 70%
×2story building
+19ft-37ft

Overall

18713

Females

6923

F45-49

6923

Half→25K

13.1 - 15.5 mi

Top 71%
×4story building
+66ft-88ft

Overall

18836

Females

7038

F45-49

7038

25K→30K

15.5 - 18.6 mi

Top 66%
×9story building
+181ft-148ft

Overall

17697

Females

6468

F45-49

6468

30K→20M

18.6 - 20.0 mi

Top 63%
×5story building
+64ft-50ft

Overall

16650

Females

5952

F45-49

5952

20M→21M

20.0 - 21.0 mi

Top 66%
×8story building
+106ft-24ft

Overall

17539

Females

6505

F45-49

6505

21M→35K

21.0 - 21.8 mi

Top 65%
×7story building
+17ft-86ft

Overall

17238

Females

6422

F45-49

6422

35K→23M

21.8 - 23.0 mi

Top 61%
×5story building
+23ft-63ft

Overall

16208

Females

5863

F45-49

5863

23M→24M

23.0 - 24.0 mi

Top 63%
×6story building
+12ft-82ft

Overall

16644

Females

6174

F45-49

6174

24M→40K

24.0 - 24.9 mi

Top 59%
×1story
+6ft-20ft

Overall

15704

Females

5696

F45-49

5696

40K→25.2M

24.9 - 25.2 mi

Top 63%
×1story
+13ft-16ft

Overall

16708

Females

6293

F45-49

6293

25.2M→Finish

25.2 - 26.2 mi

Top 58%
×2story building
+22ft-21ft

Overall

15511

Females

5555

F45-49

5555

Passing Analysis

Category:
Athletes Passed
3079
Passed By
558
Net Change
+2521
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21814
5K → 10K133415-282#21814#22096
10K → 15K32368+255#22096#21841
15K → 20K39015+375#21841#21466
20K → Half1081+107#21466#21359
Half → 25K3982+396#21359#20963
25K → 30K5471+546#20963#20417
30K → 20M2474+243#20417#20174
20M → 21M19416+178#20174#19996
21M → 35K994+95#19996#19901
35K → 23M2067+199#19901#19702
23M → 24M1366+130#19702#19572
24M → 40K1252+123#19572#19449
40K → 25.2M415+36#19449#19413
25.2M → Finish13212+120#19413#19293
TOTALS3079558+2521
📊

Passing Visuals

Category:
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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