Boston Marathon logo
BOSTON MARATHON 2023

Jim Bronson

Bib: 22457•M

MI

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Gender (Male)
#0 / 15176
Masters (Masters Men)
#0 / 9891
Division (M60-64)
#0 / 1110
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
8:51/mi
27:29
↑ 97↓ 3451.5%
10K· 6.21 mi
9:00/mi
55:26
↑ 79↓ 1380.4%
15K· 9.32 mi
9:01/mi
1:23:27
↑ 67↓ 78
20K· 12.43 mi
8:53/mi
1:51:04
↑ 106↓ 860.1%
Half· 13.11 mi
8:43/mi
1:57:01
↑ 19↓ 370.5%
25K· 15.53 mi
9:05/mi
2:19:03
↑ 66↓ 880.2%
30K· 18.64 mi
9:21/mi
2:48:05
↑ 181↓ 1480.2%
20M
9:37/mi
3:01:09
↑ 64↓ 500.2%
21M
10:13/mi
3:11:22
↑ 106↓ 241.6%
35K· 21.75 mi
9:24/mi
3:18:24
↑ 17↓ 861.7%
23M
9:57/mi
3:30:51
↑ 23↓ 630.6%
24M
9:42/mi
3:40:33
↓ 821.3%
40K· 24.85 mi
10:06/mi
3:49:11
↓ 200.3%
25.2M
10:41/mi
3:52:52
↑ 13↓ 160.2%
Finish· 26.22 mi
10:05/mi
4:03:09
↑ 22↓ 21

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:57:01
Pace8:56 /mi
2nd Half
Distance13.11 mi
Time2:06:08
Pace9:37 /mi
📊Positive Split: 7.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:21:5827:298:5127:29
8:51
-
10K
6.21 mi11:49:5555:268:5527:57
9:00
+0:09
15K
9.32 mi12:17:561:23:278:5728:01
9:01
+0:01
20K
12.43 mi12:45:331:51:048:5627:37
8:53
-0:08
Half
13.11 mi12:51:301:57:018:565:57
8:43
-0:10
25K
15.53 mi13:13:322:19:038:5722:02
9:05
+0:22
30K
18.64 mi13:42:342:48:059:0129:02
9:21
+0:16
20M
20.00 mi13:55:383:01:099:0313:04
9:37
+0:16
21M
21.00 mi14:05:513:11:229:0710:13
10:13
+0:36
35K
21.75 mi14:12:533:18:249:077:02
9:24
-0:49
23M
23.00 mi14:25:203:30:519:1012:27
9:57
+0:33
24M
24.00 mi14:35:023:40:339:119:42
9:42
-0:15
40K
24.85 mi14:43:403:49:119:138:38
10:06
+0:24
25.2M
25.20 mi14:47:213:52:529:143:41
10:41
+0:35
Finish
26.22 mi14:57:384:03:099:1710:17
10:05
-0:36

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

8:43 /mi

Average Pace

9:17 /mi

Slowest Pace

10:41 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:19:03

57% of race

Time at Steady Pace

49:08

20% of race

Time at Slower Pace

54:58

23% of race

Average Pace: 9:16 /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 mi11:21:5827:298:5127:29
8:51
#19708
10K
6.21 mi11:49:5555:268:5527:57
9:00
#20309
15K
9.32 mi12:17:561:23:278:5728:01
9:01
#20355
20K
12.43 mi12:45:331:51:048:5627:37
8:53
#20047
Half
13.11 mi12:51:301:57:018:565:57
8:43
#20001
25K
15.53 mi13:13:322:19:038:5722:02
9:05
#19892
30K
18.64 mi13:42:342:48:059:0129:02
9:21
#19667
20M
20.00 mi13:55:383:01:099:0313:04
9:37
#19633
21M
21.00 mi14:05:513:11:229:0710:13
10:13
#19555
35K
21.75 mi14:12:533:18:249:077:02
9:24
#19576
23M
23.00 mi14:25:203:30:519:1012:27
9:57
#19592
24M
24.00 mi14:35:023:40:339:119:42
9:42
#19619
40K
24.85 mi14:43:403:49:119:138:38
10:06
#19666
25.2M
25.20 mi14:47:213:52:529:143:41
10:41
#19671
Finish
26.22 mi14:57:384:03:099:1710:17
10:05
#19774
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM60-64Seg. OverallSeg. MalesSeg. M60-64
5K3.11 mi3.11 mi19708120461204620575(Top 77%)12557(Top 83%)12557(Top 1131%)
10K6.21 mi3.10 mi20309-60112364-31812364-31820856(Top 78%)12648(Top 83%)12648(Top 1139%)
15K9.32 mi3.11 mi20355-4612400-3612400-3620575(Top 77%)12557(Top 83%)12557(Top 1131%)
20K12.43 mi3.11 mi20047+30812280+12012280+12019154(Top 72%)11951(Top 79%)11951(Top 1077%)
Half13.11 mi0.68 mi20001+4612257+2312257+2319040(Top 72%)11916(Top 79%)11916(Top 1074%)
25K15.53 mi2.42 mi19892+10912219+3812219+3819353(Top 73%)11996(Top 79%)11996(Top 1081%)
30K18.64 mi3.11 mi19667+22512116+10312116+10318798(Top 71%)11696(Top 77%)11696(Top 1054%)
20M20.00 mi1.36 mi19633+3412093+2312093+2319278(Top 72%)11813(Top 78%)11813(Top 1064%)
21M21.00 mi1.00 mi19555+7812047+4612047+4618761(Top 70%)11542(Top 76%)11542(Top 1040%)
35K21.75 mi0.75 mi19576-2112049-212049-219529(Top 73%)11835(Top 78%)11835(Top 1066%)
23M23.00 mi1.25 mi19592-1612053-412053-419812(Top 74%)11939(Top 79%)11939(Top 1076%)
24M24.00 mi1.00 mi19619-2712050+312050+319885(Top 75%)11955(Top 79%)11955(Top 1077%)
40K24.85 mi0.85 mi19666-4712060-1012060-1020224(Top 76%)12024(Top 79%)12024(Top 1083%)
25.2M25.20 mi0.35 mi19671-512055+512055+519625(Top 74%)11749(Top 77%)11749(Top 1058%)
Finish26.22 mi1.02 mi19774-10312099-4412099-4421994(Top 83%)12856(Top 85%)12856(Top 1158%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 77%
×21story building
+97ft-345ft

Overall

20575

Males

12557

M60-64

12557

5K→10K

3.1 - 6.2 mi

Top 78%
×5story building
+79ft-138ft

Overall

20856

Males

12648

M60-64

12648

10K→15K

6.2 - 9.3 mi

Top 77%
×3story building
+67ft-78ft

Overall

20575

Males

12557

M60-64

12557

15K→20K

9.3 - 12.4 mi

Top 72%
×5story building
+106ft-86ft

Overall

19154

Males

11951

M60-64

11951

20K→Half

12.4 - 13.1 mi

Top 72%
×2story building
+19ft-37ft

Overall

19040

Males

11916

M60-64

11916

Half→25K

13.1 - 15.5 mi

Top 73%
×4story building
+66ft-88ft

Overall

19353

Males

11996

M60-64

11996

25K→30K

15.5 - 18.6 mi

Top 71%
×9story building
+181ft-148ft

Overall

18798

Males

11696

M60-64

11696

30K→20M

18.6 - 20.0 mi

Top 72%
×5story building
+64ft-50ft

Overall

19278

Males

11813

M60-64

11813

20M→21M

20.0 - 21.0 mi

Top 70%
×8story building
+106ft-24ft

Overall

18761

Males

11542

M60-64

11542

21M→35K

21.0 - 21.8 mi

Top 73%
×7story building
+17ft-86ft

Overall

19529

Males

11835

M60-64

11835

35K→23M

21.8 - 23.0 mi

Top 74%
×5story building
+23ft-63ft

Overall

19812

Males

11939

M60-64

11939

23M→24M

23.0 - 24.0 mi

Top 75%
×6story building
+12ft-82ft

Overall

19885

Males

11955

M60-64

11955

24M→40K

24.0 - 24.9 mi

Top 76%
×1story
+6ft-20ft

Overall

20224

Males

12024

M60-64

12024

40K→25.2M

24.9 - 25.2 mi

Top 74%
×1story
+13ft-16ft

Overall

19625

Males

11749

M60-64

11749

25.2M→Finish

25.2 - 26.2 mi

Top 83%
×2story building
+22ft-21ft

Overall

21994

Males

12856

M60-64

12856

Passing Analysis

Category:
Athletes Passed
1575
Passed By
1641
Net Change
-66
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19708
5K → 10K103704-601#19708#20309
10K → 15K164210-46#20309#20355
15K → 20K35446+308#20355#20047
20K → Half5610+46#20047#20001
Half → 25K18273+109#20001#19892
25K → 30K28762+225#19892#19667
30K → 20M9258+34#19667#19633
20M → 21M11638+78#19633#19555
21M → 35K3556-21#19555#19576
35K → 23M7086-16#19576#19592
23M → 24M4370-27#19592#19619
24M → 40K3582-47#19619#19666
40K → 25.2M2126-5#19666#19671
25.2M → Finish17120-103#19671#19774
TOTALS15751641-66
📊

Passing Visuals

Category:
Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing