Boston Marathon logo
BOSTON MARATHON 2023

John Larosa

Bib: 1378•M

CT

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 6%
Gender (Male)
#0 / 15176
Top 10%
Masters (Masters Men)
#0 / 9891
Top 3%
Division (M40-44)
#0 / 2241
Top 8%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
18:56
Rank: #885
Start → 5K
18:56 | 6:06/mi
10K· 6.21 mi
37:39
Rank: #862 (+23)
5K → 10K
18:43 | 6:01/mi
15K· 9.32 mi
56:37
Rank: #880 (-18)
10K → 15K
18:58 | 6:06/mi
20K· 12.43 mi
1:16:03
Rank: #962 (-82)
15K → 20K
19:26 | 6:15/mi
Half· 13.11 mi
1:20:17
Rank: #978 (-16)
20K → Half
4:14 | 6:12/mi
25K· 15.53 mi
1:35:45
Rank: #1028 (-50)
Half → 25K
15:28 | 6:23/mi
30K· 18.64 mi
1:56:03
Rank: #1098 (-70)
25K → 30K
20:18 | 6:32/mi
20M
2:05:12
Rank: #1157 (-59)
30K → 20M
9:09 | 6:44/mi
21M
2:12:52
Rank: #1299 (-142)
20M → 21M
7:40 | 7:40/mi
35K· 21.75 mi
2:17:46
Rank: #1324 (-25)
21M → 35K
4:54 | 6:33/mi
23M
2:26:31
Rank: #1415 (-91)
35K → 23M
8:45 | 6:59/mi
24M
2:33:16
Rank: #1453 (-38)
23M → 24M
6:45 | 6:45/mi
40K· 24.85 mi
2:39:04
Rank: #1480 (-27)
24M → 40K
5:48 | 6:47/mi
25.2M
2:41:34
Rank: #1494 (-14)
40K → 25.2M
2:30 | 7:15/mi
Finish· 26.22 mi
2:48:19
Rank: #1520 (-26)
25.2M → Finish
6:45 | 6:37/mi

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
Time1:20:17
Pace6:07 /mi
2nd Half
Distance13.11 mi
Time1:28:02
Pace6:43 /mi
📊Positive Split: 9.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:19:3418:566:0618:56
6:06
-
10K
6.21 mi10:38:1737:396:0418:43
6:01
-0:05
15K
9.32 mi10:57:1556:376:0418:58
6:06
+0:05
20K
12.43 mi11:16:411:16:036:0719:26
6:15
+0:09
Half
13.11 mi11:20:551:20:176:074:14
6:12
-0:03
25K
15.53 mi11:36:231:35:456:1015:28
6:23
+0:11
30K
18.64 mi11:56:411:56:036:1420:18
6:32
+0:09
20M
20.00 mi12:05:502:05:126:169:09
6:44
+0:12
21M
21.00 mi12:13:302:12:526:207:40
7:40
+0:56
35K
21.75 mi12:18:242:17:466:204:54
6:33
-1:07
23M
23.00 mi12:27:092:26:316:228:45
6:59
+0:26
24M
24.00 mi12:33:542:33:166:236:45
6:45
-0:14
40K
24.85 mi12:39:422:39:046:245:48
6:47
+0:02
25.2M
25.20 mi12:42:122:41:346:252:30
7:15
+0:28
Finish
26.22 mi12:48:572:48:196:256:45
6:37
-0:38

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

6:01 /mi

Average Pace

6:25 /mi

Slowest Pace

7:40 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:20:17

48% of race

Time at Steady Pace

1:03:19

38% of race

Time at Slower Pace

24:43

15% of race

Average Pace: 6:25 /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 mi10:19:3418:566:0618:56
6:06
#885
10K
6.21 mi10:38:1737:396:0418:43
6:01
#862
15K
9.32 mi10:57:1556:376:0418:58
6:06
#880
20K
12.43 mi11:16:411:16:036:0719:26
6:15
#962
Half
13.11 mi11:20:551:20:176:074:14
6:12
#978
25K
15.53 mi11:36:231:35:456:1015:28
6:23
#1028
30K
18.64 mi11:56:411:56:036:1420:18
6:32
#1098
20M
20.00 mi12:05:502:05:126:169:09
6:44
#1157
21M
21.00 mi12:13:302:12:526:207:40
7:40
#1299
35K
21.75 mi12:18:242:17:466:204:54
6:33
#1324
23M
23.00 mi12:27:092:26:316:228:45
6:59
#1415
24M
24.00 mi12:33:542:33:166:236:45
6:45
#1453
40K
24.85 mi12:39:422:39:046:245:48
6:47
#1480
25.2M
25.20 mi12:42:122:41:346:252:30
7:15
#1494
Finish
26.22 mi12:48:572:48:196:256:45
6:37
#1520
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi885832832983(Top 4%)934(Top 6%)934(Top 42%)
10K6.21 mi3.10 mi862+23812+20812+20873(Top 3%)825(Top 5%)825(Top 37%)
15K9.32 mi3.11 mi880-18830-18830-18983(Top 4%)934(Top 6%)934(Top 42%)
20K12.43 mi3.11 mi962-82913-83913-831236(Top 5%)1183(Top 8%)1183(Top 53%)
Half13.11 mi0.68 mi978-16928-15928-151396(Top 5%)1336(Top 9%)1336(Top 60%)
25K15.53 mi2.42 mi1028-50977-49977-491637(Top 6%)1567(Top 10%)1567(Top 70%)
30K18.64 mi3.11 mi1098-701046-691046-691686(Top 6%)1613(Top 11%)1613(Top 72%)
20M20.00 mi1.36 mi1157-591104-581104-582413(Top 9%)2288(Top 15%)2288(Top 102%)
21M21.00 mi1.00 mi1299-1421241-1371241-1375403(Top 20%)4756(Top 31%)4756(Top 212%)
35K21.75 mi0.75 mi1324-251264-231264-232648(Top 10%)2491(Top 16%)2491(Top 111%)
23M23.00 mi1.25 mi1415-911350-861350-863690(Top 14%)3404(Top 22%)3404(Top 152%)
24M24.00 mi1.00 mi1453-381386-361386-363341(Top 13%)3078(Top 20%)3078(Top 137%)
40K24.85 mi0.85 mi1480-271412-261412-262715(Top 10%)2501(Top 16%)2501(Top 112%)
25.2M25.20 mi0.35 mi1494-141426-141426-142646(Top 10%)2432(Top 16%)2432(Top 109%)
Finish26.22 mi1.02 mi1520-261453-271453-273071(Top 12%)2766(Top 18%)2766(Top 123%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 4%
×21stories
+97ft-345ft

Overall

983

Males

934

M40-44

934

5K→10K

3.1 - 6.2 mi

Top 3%
×5stories
+79ft-138ft

Overall

873

Males

825

M40-44

825

10K→15K

6.2 - 9.3 mi

Top 4%
×3stories
+67ft-78ft

Overall

983

Males

934

M40-44

934

15K→20K

9.3 - 12.4 mi

Top 5%
×5stories
+106ft-86ft

Overall

1236

Males

1183

M40-44

1183

20K→Half

12.4 - 13.1 mi

Top 5%
×2stories
+19ft-37ft

Overall

1396

Males

1336

M40-44

1336

Half→25K

13.1 - 15.5 mi

Top 6%
×4stories
+66ft-88ft

Overall

1637

Males

1567

M40-44

1567

25K→30K

15.5 - 18.6 mi

Top 6%
×9stories
+181ft-148ft

Overall

1686

Males

1613

M40-44

1613

30K→20M

18.6 - 20.0 mi

Top 9%
×5stories
+64ft-50ft

Overall

2413

Males

2288

M40-44

2288

20M→21M

20.0 - 21.0 mi

Top 20%
×8stories
+106ft-24ft

Overall

5403

Males

4756

M40-44

4756

21M→35K

21.0 - 21.8 mi

Top 10%
×7stories
+17ft-86ft

Overall

2648

Males

2491

M40-44

2491

35K→23M

21.8 - 23.0 mi

Top 14%
×5stories
+23ft-63ft

Overall

3690

Males

3404

M40-44

3404

23M→24M

23.0 - 24.0 mi

Top 13%
×6stories
+12ft-82ft

Overall

3341

Males

3078

M40-44

3078

24M→40K

24.0 - 24.9 mi

Top 10%
×1story
+6ft-20ft

Overall

2715

Males

2501

M40-44

2501

40K→25.2M

24.9 - 25.2 mi

Top 10%
×1story
+13ft-16ft

Overall

2646

Males

2432

M40-44

2432

25.2M→Finish

25.2 - 26.2 mi

Top 12%
×2stories
+22ft-21ft

Overall

3071

Males

2766

M40-44

2766

Passing Analysis

Category:
Athletes Passed
186
Passed By
821
Net Change
-635
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#885
5K → 10K5734+23#885#862
10K → 15K1735-18#862#880
15K → 20K1092-82#880#962
20K → Half117-16#962#978
Half → 25K1363-50#978#1028
25K → 30K1888-70#1028#1098
30K → 20M766-59#1098#1157
20M → 21M4146-142#1157#1299
21M → 35K1136-25#1299#1324
35K → 23M798-91#1324#1415
23M → 24M1452-38#1415#1453
24M → 40K1037-27#1453#1480
40K → 25.2M620-14#1480#1494
25.2M → Finish1137-26#1494#1520
TOTALS186821-635
📊

Passing Visuals

Category:
Loading...

🔥Passing Intensity

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
Share Feedback

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing