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BOSTON MARATHON 2023

Hiroshi Iizuka

Bib: 29498•M

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
10:54/mi
33:53
↑ 97↓ 3451.5%
10K· 6.21 mi
11:56/mi
1:10:59
↑ 79↓ 1380.4%
15K· 9.32 mi
11:47/mi
1:47:36
↑ 67↓ 78
20K· 12.43 mi
12:26/mi
2:26:14
↑ 106↓ 860.1%
Half· 13.11 mi
11:01/mi
2:33:45
↑ 19↓ 370.5%
25K· 15.53 mi
13:21/mi
3:06:07
↑ 66↓ 880.2%
30K· 18.64 mi
13:46/mi
3:48:53
↑ 181↓ 1480.2%
20M
12:47/mi
4:06:15
↑ 64↓ 500.2%
21M
14:14/mi
4:20:29
↑ 106↓ 241.6%
35K· 21.75 mi
13:02/mi
4:30:14
↑ 17↓ 861.7%
23M
12:20/mi
4:45:40
↑ 23↓ 630.6%
24M
11:52/mi
4:57:32
↓ 821.3%
40K· 24.85 mi
11:25/mi
5:07:18
↓ 200.3%
25.2M
12:31/mi
5:11:37
↑ 13↓ 160.2%
Finish· 26.22 mi
10:37/mi
5:22:26
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:33:45
Pace11:44 /mi
2nd Half
Distance13.11 mi
Time2:48:41
Pace12:52 /mi
📊Positive Split: 9.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:54:3233:5310:5433:53
10:54
-
10K
6.21 mi12:31:381:10:5911:2537:06
11:56
+1:02
15K
9.32 mi13:08:151:47:3611:3336:37
11:47
-0:09
20K
12.43 mi13:46:532:26:1411:4638:38
12:26
+0:39
Half
13.11 mi13:54:242:33:4511:447:31
11:01
-1:25
25K
15.53 mi14:26:463:06:0711:5932:22
13:21
+2:20
30K
18.64 mi15:09:323:48:5312:1742:46
13:46
+0:25
20M
20.00 mi15:26:544:06:1512:1917:22
12:47
-0:59
21M
21.00 mi15:41:084:20:2912:2414:14
14:14
+1:27
35K
21.75 mi15:50:534:30:1412:269:45
13:02
-1:12
23M
23.00 mi16:06:194:45:4012:2515:26
12:20
-0:42
24M
24.00 mi16:18:114:57:3212:2411:52
11:52
-0:28
40K
24.85 mi16:27:575:07:1812:229:46
11:25
-0:27
25.2M
25.20 mi16:32:165:11:3712:224:19
12:31
+1:06
Finish
26.22 mi16:43:055:22:2612:1810:49
10:37
-1:54

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

10:37 /mi

Average Pace

12:18 /mi

Slowest Pace

14:14 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:38:36

31% of race

Time at Steady Pace

2:04:43

39% of race

Time at Slower Pace

1:39:07

31% of race

Average Pace: 12:18 /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 mi11:54:3233:5310:5433:53
10:54
#25545
10K
6.21 mi12:31:381:10:5911:2537:06
11:56
#26040
15K
9.32 mi13:08:151:47:3611:3336:37
11:47
#26009
20K
12.43 mi13:46:532:26:1411:4638:38
12:26
#26008
Half
13.11 mi13:54:242:33:4511:447:31
11:01
#25954
25K
15.53 mi14:26:463:06:0711:5932:22
13:21
#25991
30K
18.64 mi15:09:323:48:5312:1742:46
13:46
#26000
20M
20.00 mi15:26:544:06:1512:1917:22
12:47
#25950
21M
21.00 mi15:41:084:20:2912:2414:14
14:14
#25915
35K
21.75 mi15:50:534:30:1412:269:45
13:02
#25909
23M
23.00 mi16:06:194:45:4012:2515:26
12:20
#25850
24M
24.00 mi16:18:114:57:3212:2411:52
11:52
#25803
40K
24.85 mi16:27:575:07:1812:229:46
11:25
#25739
25.2M
25.20 mi16:32:165:11:3712:224:19
12:31
#25726
Finish
26.22 mi16:43:055:22:2612:1810:49
10:37
#25678
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi25545147711477125911(Top 97%)14902(Top 98%)14902(Top 662%)
10K6.21 mi3.10 mi26040-49514950-17914950-17926249(Top 99%)15027(Top 99%)15027(Top 667%)
15K9.32 mi3.11 mi26009+3114945+514945+525911(Top 97%)14902(Top 98%)14902(Top 662%)
20K12.43 mi3.11 mi26008+114940+514940+525930(Top 97%)14894(Top 98%)14894(Top 661%)
Half13.11 mi0.68 mi25954+5414925+1514925+1524965(Top 94%)14466(Top 95%)14466(Top 642%)
25K15.53 mi2.42 mi25991-3714926-114926-126059(Top 98%)14925(Top 98%)14925(Top 663%)
30K18.64 mi3.11 mi26000-9149261492625895(Top 97%)14825(Top 98%)14825(Top 658%)
20M20.00 mi1.36 mi25950+5014902+2414902+2424984(Top 94%)14370(Top 95%)14370(Top 638%)
21M21.00 mi1.00 mi25915+3514881+2114881+2125237(Top 95%)14488(Top 95%)14488(Top 643%)
35K21.75 mi0.75 mi25909+614876+514876+525577(Top 96%)14623(Top 96%)14623(Top 649%)
23M23.00 mi1.25 mi25850+5914848+2814848+2824396(Top 92%)14037(Top 92%)14037(Top 623%)
24M24.00 mi1.00 mi25803+4714823+2514823+2524358(Top 91%)13981(Top 92%)13981(Top 621%)
40K24.85 mi0.85 mi25739+6414787+3614787+3623090(Top 87%)13360(Top 88%)13360(Top 593%)
25.2M25.20 mi0.35 mi25726+1314783+414783+423310(Top 88%)13464(Top 89%)13464(Top 598%)
Finish26.22 mi1.02 mi25678+4814759+2414759+2423241(Top 87%)13455(Top 89%)13455(Top 597%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 97%
×21story building
+97ft-345ft

Overall

25911

Males

14902

M45-49

14902

5K→10K

3.1 - 6.2 mi

Top 99%
×5story building
+79ft-138ft

Overall

26249

Males

15027

M45-49

15027

10K→15K

6.2 - 9.3 mi

Top 97%
×3story building
+67ft-78ft

Overall

25911

Males

14902

M45-49

14902

15K→20K

9.3 - 12.4 mi

Top 97%
×5story building
+106ft-86ft

Overall

25930

Males

14894

M45-49

14894

20K→Half

12.4 - 13.1 mi

Top 94%
×2story building
+19ft-37ft

Overall

24965

Males

14466

M45-49

14466

Half→25K

13.1 - 15.5 mi

Top 98%
×4story building
+66ft-88ft

Overall

26059

Males

14925

M45-49

14925

25K→30K

15.5 - 18.6 mi

Top 97%
×9story building
+181ft-148ft

Overall

25895

Males

14825

M45-49

14825

30K→20M

18.6 - 20.0 mi

Top 94%
×5story building
+64ft-50ft

Overall

24984

Males

14370

M45-49

14370

20M→21M

20.0 - 21.0 mi

Top 95%
×8story building
+106ft-24ft

Overall

25237

Males

14488

M45-49

14488

21M→35K

21.0 - 21.8 mi

Top 96%
×7story building
+17ft-86ft

Overall

25577

Males

14623

M45-49

14623

35K→23M

21.8 - 23.0 mi

Top 92%
×5story building
+23ft-63ft

Overall

24396

Males

14037

M45-49

14037

23M→24M

23.0 - 24.0 mi

Top 91%
×6story building
+12ft-82ft

Overall

24358

Males

13981

M45-49

13981

24M→40K

24.0 - 24.9 mi

Top 87%
×1story
+6ft-20ft

Overall

23090

Males

13360

M45-49

13360

40K→25.2M

24.9 - 25.2 mi

Top 88%
×1story
+13ft-16ft

Overall

23310

Males

13464

M45-49

13464

25.2M→Finish

25.2 - 26.2 mi

Top 87%
×2story building
+22ft-21ft

Overall

23241

Males

13455

M45-49

13455

Passing Analysis

Category:
Athletes Passed
611
Passed By
744
Net Change
-133
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#25545
5K → 10K14509-495#25545#26040
10K → 15K7645+31#26040#26009
15K → 20K5453+1#26009#26008
20K → Half551+54#26008#25954
Half → 25K2663-37#25954#25991
25K → 30K4453-9#25991#26000
30K → 20M522+50#26000#25950
20M → 21M394+35#25950#25915
21M → 35K1711+6#25915#25909
35K → 23M590+59#25909#25850
23M → 24M470+47#25850#25803
24M → 40K640+64#25803#25739
40K → 25.2M130+13#25739#25726
25.2M → Finish513+48#25726#25678
TOTALS611744-133
📊

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