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BOSTON MARATHON 2023

Brian Callow

Bib: 29868•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 (M50-54)
#0 / 2052
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
10:05/mi
31:19
↑ 97↓ 3451.5%
10K· 6.21 mi
9:37/mi
1:01:12
↑ 79↓ 1380.4%
15K· 9.32 mi
9:36/mi
1:31:03
↑ 67↓ 78
20K· 12.43 mi
10:02/mi
2:02:13
↑ 106↓ 860.1%
Half· 13.11 mi
10:23/mi
2:09:18
↑ 19↓ 370.5%
25K· 15.53 mi
10:40/mi
2:35:09
↑ 66↓ 880.2%
30K· 18.64 mi
11:13/mi
3:10:00
↑ 181↓ 1480.2%
20M
11:27/mi
3:25:33
↑ 64↓ 500.2%
21M
11:55/mi
3:37:28
↑ 106↓ 241.6%
35K· 21.75 mi
10:27/mi
3:45:17
↑ 17↓ 861.7%
23M
10:46/mi
3:58:46
↑ 23↓ 630.6%
24M
11:09/mi
4:09:55
↓ 821.3%
40K· 24.85 mi
10:48/mi
4:19:09
↓ 200.3%
25.2M
10:38/mi
4:22:49
↑ 13↓ 160.2%
Finish· 26.22 mi
9:29/mi
4:32:29
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time2:09:18
Pace9:52 /mi
2nd Half
Distance13.11 mi
Time2:23:11
Pace10:55 /mi
📊Positive Split: 10.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:51:3931:1910:0531:19
10:05
-
10K
6.21 mi12:21:321:01:129:5129:53
9:37
-0:28
15K
9.32 mi12:51:231:31:039:4629:51
9:36
-0:01
20K
12.43 mi13:22:332:02:139:5031:10
10:02
+0:26
Half
13.11 mi13:29:382:09:189:527:05
10:23
+0:21
25K
15.53 mi13:55:292:35:099:5925:51
10:40
+0:17
30K
18.64 mi14:30:203:10:0010:1234:51
11:13
+0:33
20M
20.00 mi14:45:533:25:3310:1715:33
11:27
+0:14
21M
21.00 mi14:57:483:37:2810:2111:55
11:55
+0:28
35K
21.75 mi15:05:373:45:1710:227:49
10:27
-1:28
23M
23.00 mi15:19:063:58:4610:2313:29
10:46
+0:19
24M
24.00 mi15:30:154:09:5510:2511:09
11:09
+0:23
40K
24.85 mi15:39:294:19:0910:269:14
10:48
-0:21
25.2M
25.20 mi15:43:094:22:4910:263:40
10:38
-0:10
Finish
26.22 mi15:52:494:32:2910:249:40
9:29
-1:09

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

9:29 /mi

Average Pace

10:24 /mi

Slowest Pace

11:55 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:11:53

48% of race

Time at Steady Pace

1:07:08

25% of race

Time at Slower Pace

1:13:28

27% of race

Average Pace: 10:24 /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 mi11:51:3931:1910:0531:19
10:05
#23627
10K
6.21 mi12:21:321:01:129:5129:53
9:37
#23276
15K
9.32 mi12:51:231:31:039:4629:51
9:36
#23065
20K
12.43 mi13:22:332:02:139:5031:10
10:02
#23017
Half
13.11 mi13:29:382:09:189:527:05
10:23
#23081
25K
15.53 mi13:55:292:35:099:5925:51
10:40
#23174
30K
18.64 mi14:30:203:10:0010:1234:51
11:13
#23231
20M
20.00 mi14:45:533:25:3310:1715:33
11:27
#23239
21M
21.00 mi14:57:483:37:2810:2111:55
11:55
#23213
35K
21.75 mi15:05:373:45:1710:227:49
10:27
#23163
23M
23.00 mi15:19:063:58:4610:2313:29
10:46
#23096
24M
24.00 mi15:30:154:09:5510:2511:09
11:09
#23106
40K
24.85 mi15:39:294:19:0910:269:14
10:48
#23047
25.2M
25.20 mi15:43:094:22:4910:263:40
10:38
#22996
Finish
26.22 mi15:52:494:32:2910:249:40
9:29
#22919
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM50-54Seg. OverallSeg. MalesSeg. M50-54
5K3.11 mi3.11 mi23627138901389022536(Top 85%)13427(Top 88%)13427(Top 654%)
10K6.21 mi3.10 mi23276+35113738+15213738+15222847(Top 86%)13571(Top 89%)13571(Top 661%)
15K9.32 mi3.11 mi23065+21113657+8113657+8122536(Top 85%)13427(Top 88%)13427(Top 654%)
20K12.43 mi3.11 mi23017+4813639+1813639+1822979(Top 86%)13615(Top 90%)13615(Top 663%)
Half13.11 mi0.68 mi23081-6413665-2613665-2623974(Top 90%)14046(Top 93%)14046(Top 685%)
25K15.53 mi2.42 mi23174-9313704-3913704-3923451(Top 88%)13785(Top 91%)13785(Top 672%)
30K18.64 mi3.11 mi23231-5713708-413708-423441(Top 88%)13715(Top 90%)13715(Top 668%)
20M20.00 mi1.36 mi23239-813697+1113697+1123430(Top 88%)13656(Top 90%)13656(Top 665%)
21M21.00 mi1.00 mi23213+2613677+2013677+2022617(Top 85%)13250(Top 87%)13250(Top 646%)
35K21.75 mi0.75 mi23163+5013639+3813639+3822275(Top 84%)13052(Top 86%)13052(Top 636%)
23M23.00 mi1.25 mi23096+6713600+3913600+3921910(Top 82%)12868(Top 85%)12868(Top 627%)
24M24.00 mi1.00 mi23106-1013599+113599+123310(Top 88%)13485(Top 89%)13485(Top 657%)
40K24.85 mi0.85 mi23047+5913556+4313556+4321932(Top 82%)12795(Top 84%)12795(Top 624%)
25.2M25.20 mi0.35 mi22996+5113534+2213534+2219501(Top 73%)11709(Top 77%)11709(Top 571%)
Finish26.22 mi1.02 mi22919+7713490+4413490+4420062(Top 75%)12009(Top 79%)12009(Top 585%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 85%
×21story building
+97ft-345ft

Overall

22536

Males

13427

M50-54

13427

5K→10K

3.1 - 6.2 mi

Top 86%
×5story building
+79ft-138ft

Overall

22847

Males

13571

M50-54

13571

10K→15K

6.2 - 9.3 mi

Top 85%
×3story building
+67ft-78ft

Overall

22536

Males

13427

M50-54

13427

15K→20K

9.3 - 12.4 mi

Top 86%
×5story building
+106ft-86ft

Overall

22979

Males

13615

M50-54

13615

20K→Half

12.4 - 13.1 mi

Top 90%
×2story building
+19ft-37ft

Overall

23974

Males

14046

M50-54

14046

Half→25K

13.1 - 15.5 mi

Top 88%
×4story building
+66ft-88ft

Overall

23451

Males

13785

M50-54

13785

25K→30K

15.5 - 18.6 mi

Top 88%
×9story building
+181ft-148ft

Overall

23441

Males

13715

M50-54

13715

30K→20M

18.6 - 20.0 mi

Top 88%
×5story building
+64ft-50ft

Overall

23430

Males

13656

M50-54

13656

20M→21M

20.0 - 21.0 mi

Top 85%
×8story building
+106ft-24ft

Overall

22617

Males

13250

M50-54

13250

21M→35K

21.0 - 21.8 mi

Top 84%
×7story building
+17ft-86ft

Overall

22275

Males

13052

M50-54

13052

35K→23M

21.8 - 23.0 mi

Top 82%
×5story building
+23ft-63ft

Overall

21910

Males

12868

M50-54

12868

23M→24M

23.0 - 24.0 mi

Top 88%
×6story building
+12ft-82ft

Overall

23310

Males

13485

M50-54

13485

24M→40K

24.0 - 24.9 mi

Top 82%
×1story
+6ft-20ft

Overall

21932

Males

12795

M50-54

12795

40K→25.2M

24.9 - 25.2 mi

Top 73%
×1story
+13ft-16ft

Overall

19501

Males

11709

M50-54

11709

25.2M→Finish

25.2 - 26.2 mi

Top 75%
×2story building
+22ft-21ft

Overall

20062

Males

12009

M50-54

12009

Passing Analysis

Category:
Athletes Passed
1535
Passed By
827
Net Change
+708
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#23627
5K → 10K43685+351#23627#23276
10K → 15K26958+211#23276#23065
15K → 20K157109+48#23065#23017
20K → Half872-64#23017#23081
Half → 25K69162-93#23081#23174
25K → 30K100157-57#23174#23231
30K → 20M5462-8#23231#23239
20M → 21M5428+26#23239#23213
21M → 35K599+50#23213#23163
35K → 23M8922+67#23163#23096
23M → 24M3343-10#23096#23106
24M → 40K6910+59#23106#23047
40K → 25.2M510+51#23047#22996
25.2M → Finish8710+77#22996#22919
TOTALS1535827+708
📊

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