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BOSTON MARATHON 2023

Joon Ki Lee

Bib: 23781•M

MD

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M65-69)
#0 / 549
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
9:12/mi
28:35
↑ 97↓ 3451.5%
10K· 6.21 mi
9:38/mi
58:31
↑ 79↓ 1380.4%
15K· 9.32 mi
9:29/mi
1:28:00
↑ 67↓ 78
20K· 12.43 mi
9:55/mi
1:58:50
↑ 106↓ 860.1%
Half· 13.11 mi
9:04/mi
2:05:01
↑ 19↓ 370.5%
25K· 15.53 mi
9:43/mi
2:28:35
↑ 66↓ 880.2%
30K· 18.64 mi
10:16/mi
3:00:28
↑ 181↓ 1480.2%
20M
10:12/mi
3:14:20
↑ 64↓ 500.2%
21M
10:53/mi
3:25:13
↑ 106↓ 241.6%
35K· 21.75 mi
9:35/mi
3:32:23
↑ 17↓ 861.7%
23M
10:00/mi
3:44:54
↑ 23↓ 630.6%
24M
9:53/mi
3:54:47
↓ 821.3%
40K· 24.85 mi
10:23/mi
4:03:40
↓ 200.3%
25.2M
10:50/mi
4:07:24
↑ 13↓ 160.2%
Finish· 26.22 mi
9:31/mi
4:17:06
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:05:01
Pace9:32 /mi
2nd Half
Distance13.11 mi
Time2:12:05
Pace10:05 /mi
📊Positive Split: 5.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:28:5128:359:1228:35
9:12
-
10K
6.21 mi11:58:4758:319:2529:56
9:38
+0:26
15K
9.32 mi12:28:161:28:009:2629:29
9:29
-0:09
20K
12.43 mi12:59:061:58:509:3430:50
9:55
+0:26
Half
13.11 mi13:05:172:05:019:326:11
9:04
-0:51
25K
15.53 mi13:28:512:28:359:3423:34
9:43
+0:39
30K
18.64 mi14:00:443:00:289:4131:53
10:16
+0:33
20M
20.00 mi14:14:363:14:209:4313:52
10:12
-0:04
21M
21.00 mi14:25:293:25:139:4610:53
10:53
+0:41
35K
21.75 mi14:32:393:32:239:467:10
9:35
-1:18
23M
23.00 mi14:45:103:44:549:4712:31
10:00
+0:25
24M
24.00 mi14:55:033:54:479:479:53
9:53
-0:07
40K
24.85 mi15:03:564:03:409:488:53
10:23
+0:30
25.2M
25.20 mi15:07:404:07:249:493:44
10:50
+0:27
Finish
26.22 mi15:17:224:17:069:499:42
9:31
-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

9:04 /mi

Average Pace

9:49 /mi

Slowest Pace

10:53 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:21:07

32% of race

Time at Steady Pace

1:46:44

42% of race

Time at Slower Pace

1:09:15

27% of race

Average Pace: 9:48 /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 mi11:28:5128:359:1228:35
9:12
#21206
10K
6.21 mi11:58:4758:319:2529:56
9:38
#22097
15K
9.32 mi12:28:161:28:009:2629:29
9:29
#22122
20K
12.43 mi12:59:061:58:509:3430:50
9:55
#22290
Half
13.11 mi13:05:172:05:019:326:11
9:04
#22212
25K
15.53 mi13:28:512:28:359:3423:34
9:43
#22068
30K
18.64 mi14:00:443:00:289:4131:53
10:16
#22001
20M
20.00 mi14:14:363:14:209:4313:52
10:12
#21922
21M
21.00 mi14:25:293:25:139:4610:53
10:53
#21854
35K
21.75 mi14:32:393:32:239:467:10
9:35
#21799
23M
23.00 mi14:45:103:44:549:4712:31
10:00
#21677
24M
24.00 mi14:55:033:54:479:479:53
9:53
#21632
40K
24.85 mi15:03:564:03:409:488:53
10:23
#21622
25.2M
25.20 mi15:07:404:07:249:493:44
10:50
#21580
Finish
26.22 mi15:17:224:17:069:499:42
9:31
#21531
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM65-69Seg. OverallSeg. MalesSeg. M65-69
5K3.11 mi3.11 mi21206127071270722226(Top 83%)13285(Top 88%)13285(Top 2420%)
10K6.21 mi3.10 mi22097-89113172-46513172-46522887(Top 86%)13588(Top 90%)13588(Top 2475%)
15K9.32 mi3.11 mi22122-2513199-2713199-2722226(Top 83%)13285(Top 88%)13285(Top 2420%)
20K12.43 mi3.11 mi22290-16813290-9113290-9122715(Top 85%)13495(Top 89%)13495(Top 2458%)
Half13.11 mi0.68 mi22212+7813246+4413246+4420686(Top 78%)12606(Top 83%)12606(Top 2296%)
25K15.53 mi2.42 mi22068+14413185+6113185+6121521(Top 81%)12933(Top 85%)12933(Top 2356%)
30K18.64 mi3.11 mi22001+6713145+4013145+4021690(Top 81%)12933(Top 85%)12933(Top 2356%)
20M20.00 mi1.36 mi21922+7913096+4913096+4921012(Top 79%)12572(Top 83%)12572(Top 2290%)
21M21.00 mi1.00 mi21854+6813061+3513061+3520557(Top 77%)12319(Top 81%)12319(Top 2244%)
35K21.75 mi0.75 mi21799+5513024+3713024+3720086(Top 75%)12087(Top 80%)12087(Top 2202%)
23M23.00 mi1.25 mi21677+12212953+7112953+7119979(Top 75%)12014(Top 79%)12014(Top 2188%)
24M24.00 mi1.00 mi21632+4512921+3212921+3220459(Top 77%)12200(Top 80%)12200(Top 2222%)
40K24.85 mi0.85 mi21622+1012911+1012911+1020944(Top 79%)12353(Top 81%)12353(Top 2250%)
25.2M25.20 mi0.35 mi21580+4212885+2612885+2620028(Top 75%)11936(Top 79%)11936(Top 2174%)
Finish26.22 mi1.02 mi21531+4912854+3112854+3120190(Top 76%)12059(Top 79%)12059(Top 2197%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 83%
×21story building
+97ft-345ft

Overall

22226

Males

13285

M65-69

13285

5K→10K

3.1 - 6.2 mi

Top 86%
×5story building
+79ft-138ft

Overall

22887

Males

13588

M65-69

13588

10K→15K

6.2 - 9.3 mi

Top 83%
×3story building
+67ft-78ft

Overall

22226

Males

13285

M65-69

13285

15K→20K

9.3 - 12.4 mi

Top 85%
×5story building
+106ft-86ft

Overall

22715

Males

13495

M65-69

13495

20K→Half

12.4 - 13.1 mi

Top 78%
×2story building
+19ft-37ft

Overall

20686

Males

12606

M65-69

12606

Half→25K

13.1 - 15.5 mi

Top 81%
×4story building
+66ft-88ft

Overall

21521

Males

12933

M65-69

12933

25K→30K

15.5 - 18.6 mi

Top 81%
×9story building
+181ft-148ft

Overall

21690

Males

12933

M65-69

12933

30K→20M

18.6 - 20.0 mi

Top 79%
×5story building
+64ft-50ft

Overall

21012

Males

12572

M65-69

12572

20M→21M

20.0 - 21.0 mi

Top 77%
×8story building
+106ft-24ft

Overall

20557

Males

12319

M65-69

12319

21M→35K

21.0 - 21.8 mi

Top 75%
×7story building
+17ft-86ft

Overall

20086

Males

12087

M65-69

12087

35K→23M

21.8 - 23.0 mi

Top 75%
×5story building
+23ft-63ft

Overall

19979

Males

12014

M65-69

12014

23M→24M

23.0 - 24.0 mi

Top 77%
×6story building
+12ft-82ft

Overall

20459

Males

12200

M65-69

12200

24M→40K

24.0 - 24.9 mi

Top 79%
×1story
+6ft-20ft

Overall

20944

Males

12353

M65-69

12353

40K→25.2M

24.9 - 25.2 mi

Top 75%
×1story
+13ft-16ft

Overall

20028

Males

11936

M65-69

11936

25.2M→Finish

25.2 - 26.2 mi

Top 76%
×2story building
+22ft-21ft

Overall

20190

Males

12059

M65-69

12059

Passing Analysis

Category:
Athletes Passed
1329
Passed By
1654
Net Change
-325
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21206
5K → 10K35926-891#21206#22097
10K → 15K171196-25#22097#22122
15K → 20K81249-168#22122#22290
20K → Half780+78#22290#22212
Half → 25K18339+144#22212#22068
25K → 30K167100+67#22068#22001
30K → 20M10930+79#22001#21922
20M → 21M9123+68#21922#21854
21M → 35K616+55#21854#21799
35K → 23M1319+122#21799#21677
23M → 24M6924+45#21677#21632
24M → 40K3727+10#21632#21622
40K → 25.2M475+42#21622#21580
25.2M → Finish6920+49#21580#21531
TOTALS13291654-325
📊

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