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BOSTON MARATHON 2023

Kuei Lo

Bib: 27718•M

MA

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M45-49)
#0 / 2252
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
29:11
↑ 97↓ 3451.5%
10K· 6.21 mi
8:46/mi
56:25
↑ 79↓ 1380.4%
15K· 9.32 mi
8:20/mi
1:22:17
↑ 67↓ 78
20K· 12.43 mi
9:16/mi
1:51:05
↑ 106↓ 860.1%
Half· 13.11 mi
8:26/mi
1:56:50
↑ 19↓ 370.5%
25K· 15.53 mi
8:52/mi
2:18:21
↑ 66↓ 880.2%
30K· 18.64 mi
8:49/mi
2:45:46
↑ 181↓ 1480.2%
20M
9:18/mi
2:58:25
↑ 64↓ 500.2%
21M
9:18/mi
3:07:43
↑ 106↓ 241.6%
35K· 21.75 mi
8:43/mi
3:14:14
↑ 17↓ 861.7%
23M
10:41/mi
3:27:37
↑ 23↓ 630.6%
24M
10:28/mi
3:38:05
↓ 821.3%
40K· 24.85 mi
10:14/mi
3:46:50
↓ 200.3%
25.2M
10:21/mi
3:50:24
↑ 13↓ 160.2%
Finish· 26.22 mi
9:31/mi
4:00:06
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:56:50
Pace8:55 /mi
2nd Half
Distance13.11 mi
Time2:03:16
Pace9:24 /mi
📊Positive Split: 5.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:51:2429:119:2429:11
9:24
-
10K
6.21 mi12:18:3856:259:0527:14
8:46
-0:38
15K
9.32 mi12:44:301:22:178:5025:52
8:20
-0:26
20K
12.43 mi13:13:181:51:058:5628:48
9:16
+0:56
Half
13.11 mi13:19:031:56:508:555:45
8:26
-0:50
25K
15.53 mi13:40:342:18:218:5421:31
8:52
+0:26
30K
18.64 mi14:07:592:45:468:5427:25
8:49
-0:03
20M
20.00 mi14:20:382:58:258:5512:39
9:18
+0:29
21M
21.00 mi14:29:563:07:438:569:18
9:18
0:00
35K
21.75 mi14:36:273:14:148:566:31
8:43
-0:35
23M
23.00 mi14:49:503:27:379:0213:23
10:41
+1:58
24M
24.00 mi15:00:183:38:059:0510:28
10:28
-0:13
40K
24.85 mi15:09:033:46:509:088:45
10:14
-0:14
25.2M
25.20 mi15:12:373:50:249:093:34
10:21
+0:07
Finish
26.22 mi15:22:194:00:069:109:42
9:31
-0:50

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

8:20 /mi

Average Pace

9:10 /mi

Slowest Pace

10:41 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:54:18

48% of race

Time at Steady Pace

1:29:38

37% of race

Time at Slower Pace

36:10

15% 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 mi11:51:2429:119:2429:11
9:24
#21790
10K
6.21 mi12:18:3856:259:0527:14
8:46
#20977
15K
9.32 mi12:44:301:22:178:5025:52
8:20
#19747
20K
12.43 mi13:13:181:51:058:5628:48
9:16
#20054
Half
13.11 mi13:19:031:56:508:555:45
8:26
#19907
25K
15.53 mi13:40:342:18:218:5421:31
8:52
#19653
30K
18.64 mi14:07:592:45:468:5427:25
8:49
#19066
20M
20.00 mi14:20:382:58:258:5512:39
9:18
#18975
21M
21.00 mi14:29:563:07:438:569:18
9:18
#18738
35K
21.75 mi14:36:273:14:148:566:31
8:43
#18647
23M
23.00 mi14:49:503:27:379:0213:23
10:41
#18965
24M
24.00 mi15:00:183:38:059:0510:28
10:28
#19162
40K
24.85 mi15:09:033:46:509:088:45
10:14
#19253
25.2M
25.20 mi15:12:373:50:249:093:34
10:21
#19266
Finish
26.22 mi15:22:194:00:069:109:42
9:31
#19333
Faster pace
Steady pace
Slower pace
Est.Checkpoint not recorded (estimated)
~Segment time uses estimated prior

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi21790129851298516695(Top 63%)10951(Top 72%)10951(Top 486%)
10K6.21 mi3.10 mi20977+81312644+34112644+34119753(Top 74%)12184(Top 80%)12184(Top 541%)
15K9.32 mi3.11 mi19747+123012137+50712137+50716695(Top 63%)10951(Top 72%)10951(Top 486%)
20K12.43 mi3.11 mi20054-30712283-14612283-14620852(Top 78%)12690(Top 84%)12690(Top 563%)
Half13.11 mi0.68 mi19907+14712216+6712216+6717292(Top 65%)11223(Top 74%)11223(Top 498%)
25K15.53 mi2.42 mi19653+25412120+9612120+9618329(Top 69%)11564(Top 76%)11564(Top 513%)
30K18.64 mi3.11 mi19066+58711868+25211868+25216212(Top 61%)10574(Top 70%)10574(Top 470%)
20M20.00 mi1.36 mi18975+9111807+6111807+6118037(Top 68%)11249(Top 74%)11249(Top 500%)
21M21.00 mi1.00 mi18738+23711706+10111706+10115033(Top 56%)9930(Top 65%)9930(Top 441%)
35K21.75 mi0.75 mi18647+9111669+3711669+3716461(Top 62%)10478(Top 69%)10478(Top 465%)
23M23.00 mi1.25 mi18965-31811780-11111780-11121723(Top 82%)12780(Top 84%)12780(Top 567%)
24M24.00 mi1.00 mi19162-19711859-7911859-7921948(Top 82%)12848(Top 85%)12848(Top 571%)
40K24.85 mi0.85 mi19253-9111891-3211891-3220557(Top 77%)12174(Top 80%)12174(Top 541%)
25.2M25.20 mi0.35 mi19266-1311890+111890+118589(Top 70%)11298(Top 74%)11298(Top 502%)
Finish26.22 mi1.02 mi19333-6711913-2311913-2320182(Top 76%)12051(Top 79%)12051(Top 535%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 63%
×21story building
+97ft-345ft

Overall

16695

Males

10951

M45-49

10951

5K→10K

3.1 - 6.2 mi

Top 74%
×5story building
+79ft-138ft

Overall

19753

Males

12184

M45-49

12184

10K→15K

6.2 - 9.3 mi

Top 63%
×3story building
+67ft-78ft

Overall

16695

Males

10951

M45-49

10951

15K→20K

9.3 - 12.4 mi

Top 78%
×5story building
+106ft-86ft

Overall

20852

Males

12690

M45-49

12690

20K→Half

12.4 - 13.1 mi

Top 65%
×2story building
+19ft-37ft

Overall

17292

Males

11223

M45-49

11223

Half→25K

13.1 - 15.5 mi

Top 69%
×4story building
+66ft-88ft

Overall

18329

Males

11564

M45-49

11564

25K→30K

15.5 - 18.6 mi

Top 61%
×9story building
+181ft-148ft

Overall

16212

Males

10574

M45-49

10574

30K→20M

18.6 - 20.0 mi

Top 68%
×5story building
+64ft-50ft

Overall

18037

Males

11249

M45-49

11249

20M→21M

20.0 - 21.0 mi

Top 56%
×8story building
+106ft-24ft

Overall

15033

Males

9930

M45-49

9930

21M→35K

21.0 - 21.8 mi

Top 62%
×7story building
+17ft-86ft

Overall

16461

Males

10478

M45-49

10478

35K→23M

21.8 - 23.0 mi

Top 82%
×5story building
+23ft-63ft

Overall

21723

Males

12780

M45-49

12780

23M→24M

23.0 - 24.0 mi

Top 82%
×6story building
+12ft-82ft

Overall

21948

Males

12848

M45-49

12848

24M→40K

24.0 - 24.9 mi

Top 77%
×1story
+6ft-20ft

Overall

20557

Males

12174

M45-49

12174

40K→25.2M

24.9 - 25.2 mi

Top 70%
×1story
+13ft-16ft

Overall

18589

Males

11298

M45-49

11298

25.2M→Finish

25.2 - 26.2 mi

Top 76%
×2story building
+22ft-21ft

Overall

20182

Males

12051

M45-49

12051

Passing Analysis

Category:
Athletes Passed
3782
Passed By
1325
Net Change
+2457
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21790
5K → 10K85845+813#21790#20977
10K → 15K12333+1230#20977#19747
15K → 20K94401-307#19747#20054
20K → Half1470+147#20054#19907
Half → 25K27925+254#19907#19653
25K → 30K5947+587#19653#19066
30K → 20M12534+91#19066#18975
20M → 21M2414+237#18975#18738
21M → 35K954+91#18738#18647
35K → 23M14332-318#18647#18965
23M → 24M20217-197#18965#19162
24M → 40K29120-91#19162#19253
40K → 25.2M2134-13#19253#19266
25.2M → Finish3299-67#19266#19333
TOTALS37821325+2457
📊

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