Boston Marathon logo
BOSTON MARATHON 2023

Kristof Van Herck

Bib: 4486•M

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 10%
Gender (Male)
#0 / 15176
Top 16%
Division (M18-39)
#0 / 5285
Top 36%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
19:22
Rank: #1221
Start → 5K
19:22 | 6:14/mi
10K· 6.21 mi
38:37
Rank: #1242 (-21)
5K → 10K
19:15 | 6:12/mi
15K· 9.32 mi
58:12
Rank: #1353 (-111)
10K → 15K
19:35 | 6:18/mi
20K· 12.43 mi
1:18:15
Rank: #1510 (-157)
15K → 20K
20:03 | 6:27/mi
Half· 13.11 mi
1:22:35
Rank: #1540 (-30)
20K → Half
4:20 | 6:21/mi
25K· 15.53 mi
1:38:22
Rank: #1612 (-72)
Half → 25K
15:47 | 6:31/mi
30K· 18.64 mi
1:59:30
Rank: #1782 (-170)
25K → 30K
21:08 | 6:48/mi
20M
2:08:58
Rank: #1891 (-109)
30K → 20M
9:28 | 6:58/mi
21M
2:16:31
Rank: #2016 (-125)
20M → 21M
7:33 | 7:33/mi
35K· 21.75 mi
2:21:40
Rank: #2078 (-62)
21M → 35K
5:09 | 6:53/mi
23M
2:30:50
Rank: #2218 (-140)
35K → 23M
9:10 | 7:19/mi
24M
2:37:58
Rank: #2310 (-92)
23M → 24M
7:08 | 7:08/mi
40K· 24.85 mi
2:44:22
Rank: #2398 (-88)
24M → 40K
6:24 | 7:29/mi
25.2M
2:47:11
Rank: #2439 (-41)
40K → 25.2M
2:49 | 8:10/mi
Finish· 26.22 mi
2:54:36
Rank: #2604 (-165)
25.2M → Finish
7:25 | 7:17/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
Time1:22:35
Pace6:18 /mi
2nd Half
Distance13.11 mi
Time1:32:01
Pace7:01 /mi
📊Positive Split: 11.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:20:5519:226:1419:22
6:14
-
10K
6.21 mi10:40:1038:376:1319:15
6:12
-0:02
15K
9.32 mi10:59:4558:126:1519:35
6:18
+0:06
20K
12.43 mi11:19:481:18:156:1820:03
6:27
+0:09
Half
13.11 mi11:24:081:22:356:184:20
6:21
-0:06
25K
15.53 mi11:39:551:38:226:2015:47
6:31
+0:10
30K
18.64 mi12:01:031:59:306:2521:08
6:48
+0:17
20M
20.00 mi12:10:312:08:586:279:28
6:58
+0:10
21M
21.00 mi12:18:042:16:316:307:33
7:33
+0:35
35K
21.75 mi12:23:132:21:406:315:09
6:53
-0:40
23M
23.00 mi12:32:232:30:506:339:10
7:19
+0:26
24M
24.00 mi12:39:312:37:586:357:08
7:08
-0:11
40K
24.85 mi12:45:552:44:226:376:24
7:29
+0:21
25.2M
25.20 mi12:48:442:47:116:382:49
8:10
+0:41
Finish
26.22 mi12:56:092:54:366:407:25
7:17
-0:53

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

6:12 /mi

Average Pace

6:40 /mi

Slowest Pace

8:10 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:38:22

56% of race

Time at Steady Pace

42:53

25% of race

Time at Slower Pace

33:21

19% of race

Average Pace: 6:40 /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 mi10:20:5519:226:1419:22
6:14
#1221
10K
6.21 mi10:40:1038:376:1319:15
6:12
#1242
15K
9.32 mi10:59:4558:126:1519:35
6:18
#1353
20K
12.43 mi11:19:481:18:156:1820:03
6:27
#1510
Half
13.11 mi11:24:081:22:356:184:20
6:21
#1540
25K
15.53 mi11:39:551:38:226:2015:47
6:31
#1612
30K
18.64 mi12:01:031:59:306:2521:08
6:48
#1782
20M
20.00 mi12:10:312:08:586:279:28
6:58
#1891
21M
21.00 mi12:18:042:16:316:307:33
7:33
#2016
35K
21.75 mi12:23:132:21:406:315:09
6:53
#2078
23M
23.00 mi12:32:232:30:506:339:10
7:19
#2218
24M
24.00 mi12:39:312:37:586:357:08
7:08
#2310
40K
24.85 mi12:45:552:44:226:376:24
7:29
#2398
25.2M
25.20 mi12:48:442:47:116:382:49
8:10
#2439
Finish
26.22 mi12:56:092:54:366:407:25
7:17
#2604
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi1221115811581673(Top 6%)1599(Top 11%)1599(Top 30%)
10K6.21 mi3.10 mi1242-211177-191177-191351(Top 5%)1288(Top 8%)1288(Top 24%)
15K9.32 mi3.11 mi1353-1111289-1121289-1121673(Top 6%)1599(Top 11%)1599(Top 30%)
20K12.43 mi3.11 mi1510-1571442-1531442-1532063(Top 8%)1982(Top 13%)1982(Top 38%)
Half13.11 mi0.68 mi1540-301471-291471-292028(Top 8%)1951(Top 13%)1951(Top 37%)
25K15.53 mi2.42 mi1612-721544-731544-732217(Top 8%)2127(Top 14%)2127(Top 40%)
30K18.64 mi3.11 mi1782-1701706-1621706-1622990(Top 11%)2828(Top 19%)2828(Top 54%)
20M20.00 mi1.36 mi1891-1091809-1031809-1033781(Top 14%)3517(Top 23%)3517(Top 67%)
21M21.00 mi1.00 mi2016-1251931-1221931-1224788(Top 18%)4315(Top 28%)4315(Top 82%)
35K21.75 mi0.75 mi2078-621993-621993-624635(Top 17%)4200(Top 28%)4200(Top 79%)
23M23.00 mi1.25 mi2218-1402126-1332126-1335393(Top 20%)4746(Top 31%)4746(Top 90%)
24M24.00 mi1.00 mi2310-922211-852211-855335(Top 20%)4660(Top 31%)4660(Top 88%)
40K24.85 mi0.85 mi2398-882293-822293-826579(Top 25%)5367(Top 35%)5367(Top 102%)
25.2M25.20 mi0.35 mi2439-412330-372330-377363(Top 28%)5763(Top 38%)5763(Top 109%)
Finish26.22 mi1.02 mi2604-1652482-1522482-1526915(Top 26%)5498(Top 36%)5498(Top 104%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 6%
×21stories
+97ft-345ft

Overall

1673

Males

1599

M18-39

1599

5K→10K

3.1 - 6.2 mi

Top 5%
×5stories
+79ft-138ft

Overall

1351

Males

1288

M18-39

1288

10K→15K

6.2 - 9.3 mi

Top 6%
×3stories
+67ft-78ft

Overall

1673

Males

1599

M18-39

1599

15K→20K

9.3 - 12.4 mi

Top 8%
×5stories
+106ft-86ft

Overall

2063

Males

1982

M18-39

1982

20K→Half

12.4 - 13.1 mi

Top 8%
×2stories
+19ft-37ft

Overall

2028

Males

1951

M18-39

1951

Half→25K

13.1 - 15.5 mi

Top 8%
×4stories
+66ft-88ft

Overall

2217

Males

2127

M18-39

2127

25K→30K

15.5 - 18.6 mi

Top 11%
×9stories
+181ft-148ft

Overall

2990

Males

2828

M18-39

2828

30K→20M

18.6 - 20.0 mi

Top 14%
×5stories
+64ft-50ft

Overall

3781

Males

3517

M18-39

3517

20M→21M

20.0 - 21.0 mi

Top 18%
×8stories
+106ft-24ft

Overall

4788

Males

4315

M18-39

4315

21M→35K

21.0 - 21.8 mi

Top 17%
×7stories
+17ft-86ft

Overall

4635

Males

4200

M18-39

4200

35K→23M

21.8 - 23.0 mi

Top 20%
×5stories
+23ft-63ft

Overall

5393

Males

4746

M18-39

4746

23M→24M

23.0 - 24.0 mi

Top 20%
×6stories
+12ft-82ft

Overall

5335

Males

4660

M18-39

4660

24M→40K

24.0 - 24.9 mi

Top 25%
×1story
+6ft-20ft

Overall

6579

Males

5367

M18-39

5367

40K→25.2M

24.9 - 25.2 mi

Top 28%
×1story
+13ft-16ft

Overall

7363

Males

5763

M18-39

5763

25.2M→Finish

25.2 - 26.2 mi

Top 26%
×2stories
+22ft-21ft

Overall

6915

Males

5498

M18-39

5498

Passing Analysis

Category:
Athletes Passed
188
Passed By
1571
Net Change
-1383
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#1221
5K → 10K5879-21#1221#1242
10K → 15K14125-111#1242#1353
15K → 20K12169-157#1353#1510
20K → Half232-30#1510#1540
Half → 25K2395-72#1540#1612
25K → 30K18188-170#1612#1782
30K → 20M8117-109#1782#1891
20M → 21M7132-125#1891#2016
21M → 35K668-62#2016#2078
35K → 23M13153-140#2078#2218
23M → 24M8100-92#2218#2310
24M → 40K795-88#2310#2398
40K → 25.2M647-41#2398#2439
25.2M → Finish6171-165#2439#2604
TOTALS1881571-1383
📊

Passing Visuals

Category:

📈Position Graph

Loading...

🎨Heatmap Timeline

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