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BOSTON MARATHON 2023

Jon Klein

MA

Bib: 11135 M

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 9%
Gender (Male)
#0 / 15176
Top 15%
Masters (Masters Men)
#0 / 9891
Top 5%
Division (M45-49)
#0 / 2252
Top 6%
Race Day Weather
49°/39°F
light intensity drizzle

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
6:47/mi
21:05
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
6:21/mi
40:48
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
6:22/mi
1:00:34
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
6:28/mi
1:20:38
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
6:20/mi
1:24:57
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
6:29/mi
1:40:40
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
6:48/mi
2:01:47
↑ 181↓ 1480.2%
138 ft elev
20M
6:51/mi
2:11:05
↑ 64↓ 500.2%
148 ft elev
21M
7:15/mi
2:18:20
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
6:38/mi
2:23:18
↑ 17↓ 861.7%
156 ft elev
23M
7:00/mi
2:32:04
↑ 23↓ 630.6%
116 ft elev
24M
6:42/mi
2:38:46
↓ 821.3%
34 ft elev
40K· 24.85 mi
6:49/mi
2:44:36
↓ 200.3%
20 ft elev
25.2M
7:21/mi
2:47:08
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
6:36/mi
2:53:52
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:24:576:29 /mi⚡ faster
2nd Half
1:28:556:47 /mi+4.7%
Positive split — 4.7% slower in the second half
Is this your race?

Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:47:5521:056:4721:05
6:47
-
10K
6.21 mi11:07:3840:486:3419:43
6:21
-0:26
15K
9.32 mi11:27:241:00:346:3019:46
6:22
+0:01
20K
12.43 mi11:47:281:20:386:2920:04
6:28
+0:06
Half
13.11 mi11:51:471:24:576:294:19
6:20
-0:08
25K
15.53 mi12:07:301:40:406:2915:43
6:29
+0:09
30K
18.64 mi12:28:372:01:476:3221:07
6:48
+0:19
20M
20.00 mi12:37:552:11:056:339:18
6:51
+0:03
21M
21.00 mi12:45:102:18:206:357:15
7:15
+0:24
35K
21.75 mi12:50:082:23:186:354:58
6:38
-0:37
23M
23.00 mi12:58:542:32:046:378:46
7:00
+0:22
24M
24.00 mi13:05:362:38:466:376:42
6:42
-0:18
40K
24.85 mi13:11:262:44:366:375:50
6:49
+0:07
25.2M
25.20 mi13:13:582:47:086:382:32
7:21
+0:32
Finish
26.22 mi13:20:422:53:526:386:44
6:36
-0:45

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

6:20 /mi

Average Pace

6:38 /mi

Slowest Pace

7:21 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Segment Time Comparison

Time at Faster Pace

2:35:19

89% of race

Time at Steady Pace

18:33

11% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 6:38 /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 mi10:47:5521:056:4721:05
6:47
#4529
10K
6.21 mi11:07:3840:486:3419:43
6:21
#2895
15K
9.32 mi11:27:241:00:346:3019:46
6:22
#2516
20K
12.43 mi11:47:281:20:386:2920:04
6:28
#2383
Half
13.11 mi11:51:471:24:576:294:19
6:20
#2366
25K
15.53 mi12:07:301:40:406:2915:43
6:29
#2312
30K
18.64 mi12:28:372:01:476:3221:07
6:48
#2388
20M
20.00 mi12:37:552:11:056:339:18
6:51
#2404
21M
21.00 mi12:45:102:18:206:357:15
7:15
#2418
35K
21.75 mi12:50:082:23:186:354:58
6:38
#2424
23M
23.00 mi12:58:542:32:046:378:46
7:00
#2447
24M
24.00 mi13:05:362:38:466:376:42
6:42
#2441
40K
24.85 mi13:11:262:44:366:375:50
6:49
#2435
25.2M
25.20 mi13:13:582:47:086:382:32
7:21
#2427
Finish
26.22 mi13:20:422:53:526:386:44
6:36
#2442
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi452942234223193018481848
10K6.21 mi3.10 mi2895+16342761+14622761+1462196718841884
15K9.32 mi3.11 mi2516+3792403+3582403+358193018481848
20K12.43 mi3.11 mi2383+1332283+1202283+120208119981998
Half13.11 mi0.68 mi2366+172268+152268+15191518401840
25K15.53 mi2.42 mi2312+542217+512217+51208820022002
30K18.64 mi3.11 mi2388-762289-722289-72294827902790
20M20.00 mi1.36 mi2404-162302-132302-13306028742874
21M21.00 mi1.00 mi2418-142317-152317-15332930993099
35K21.75 mi0.75 mi2424-62321-42321-4319029752975
23M23.00 mi1.25 mi2447-232341-202341-20377434813481
24M24.00 mi1.00 mi2441+62335+62335+6308528602860
40K24.85 mi0.85 mi2435+62328+72328+7291726842684
25.2M25.20 mi0.35 mi2427+82319+92319+9309728202820
Finish26.22 mi1.02 mi2442-152333-142333-14300127102710

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 7%
×21story building
+97ft-345ft

Overall

1930

Males

1848

M45-49

1848

5K→10K

3.1 - 6.2 mi

Top 7%
×5story building
+79ft-138ft

Overall

1967

Males

1884

M45-49

1884

10K→15K

6.2 - 9.3 mi

Top 7%
×3story building
+67ft-78ft

Overall

1930

Males

1848

M45-49

1848

15K→20K

9.3 - 12.4 mi

Top 8%
×5story building
+106ft-86ft

Overall

2081

Males

1998

M45-49

1998

20K→Half

12.4 - 13.1 mi

Top 7%
×2story building
+19ft-37ft

Overall

1915

Males

1840

M45-49

1840

Half→25K

13.1 - 15.5 mi

Top 8%
×4story building
+66ft-88ft

Overall

2088

Males

2002

M45-49

2002

25K→30K

15.5 - 18.6 mi

Top 11%
×9story building
+181ft-148ft

Overall

2948

Males

2790

M45-49

2790

30K→20M

18.6 - 20.0 mi

Top 11%
×5story building
+64ft-50ft

Overall

3060

Males

2874

M45-49

2874

20M→21M

20.0 - 21.0 mi

Top 13%
×8story building
+106ft-24ft

Overall

3329

Males

3099

M45-49

3099

21M→35K

21.0 - 21.8 mi

Top 12%
×7story building
+17ft-86ft

Overall

3190

Males

2975

M45-49

2975

35K→23M

21.8 - 23.0 mi

Top 14%
×5story building
+23ft-63ft

Overall

3774

Males

3481

M45-49

3481

23M→24M

23.0 - 24.0 mi

Top 12%
×6story building
+12ft-82ft

Overall

3085

Males

2860

M45-49

2860

24M→40K

24.0 - 24.9 mi

Top 11%
×1story
+6ft-20ft

Overall

2917

Males

2684

M45-49

2684

40K→25.2M

24.9 - 25.2 mi

Top 12%
×1story
+13ft-16ft

Overall

3097

Males

2820

M45-49

2820

25.2M→Finish

25.2 - 26.2 mi

Top 11%
×2story building
+22ft-21ft

Overall

3001

Males

2710

M45-49

2710

Passing Analysis

Category:
Athletes Passed
2526
Passed By
439
Net Change
+2087
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#4529
5K → 10K16362+1634#4529#2895
10K → 15K3845+379#2895#2516
15K → 20K1429+133#2516#2383
20K → Half236+17#2383#2366
Half → 25K8026+54#2366#2312
25K → 30K42118-76#2312#2388
30K → 20M2945-16#2388#2404
20M → 21M2943-14#2404#2418
21M → 35K2329-6#2418#2424
35K → 23M3053-23#2424#2447
23M → 24M3024+6#2447#2441
24M → 40K2418+6#2441#2435
40K → 25.2M2113+8#2435#2427
25.2M → Finish3348-15#2427#2442
TOTALS2526439+2087

Passing Charts

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