Boston Marathon logo
BOSTON MARATHON 2023

Alex Christofferson

Bib: 31030•M

MA

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

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
30:29
Rank: #22948
Start → 5K
30:29 | 9:49/mi
10K· 6.21 mi
1:00:16
Rank: #22898 (+50)
5K → 10K
29:47 | 9:35/mi
15K· 9.32 mi
1:29:20
Rank: #22541 (+357)
10K → 15K
29:04 | 9:21/mi
20K· 12.43 mi
1:58:49
Rank: #22285 (+256)
15K → 20K
29:29 | 9:29/mi
Half· 13.11 mi
2:05:09
Rank: #22238 (+47)
20K → Half
6:20 | 9:17/mi
25K· 15.53 mi
2:27:53
Rank: #21950 (+288)
Half → 25K
22:44 | 9:23/mi
30K· 18.64 mi
2:56:56
Rank: #21456 (+494)
25K → 30K
29:03 | 9:21/mi
20M
3:08:56
Rank: #21106 (+350)
30K → 20M
12:00 | 8:50/mi
21M
3:18:04
Rank: #20798 (+308)
20M → 21M
9:08 | 9:08/mi
35K· 21.75 mi
3:24:04
Rank: #20573 (+225)
21M → 35K
6:00 | 8:01/mi
23M
3:34:20
Rank: #20195 (+378)
35K → 23M
10:16 | 8:12/mi
24M
3:42:11
Rank: #19886 (+309)
23M → 24M
7:51 | 7:51/mi
40K· 24.85 mi
3:49:11
Rank: #19662 (+224)
24M → 40K
7:00 | 8:11/mi
25.2M
3:52:06
Rank: #19544 (+118)
40K → 25.2M
2:55 | 8:27/mi
Finish· 26.22 mi
4:00:37
Rank: #19412 (+132)
25.2M → Finish
8:31 | 8:21/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 Half
Distance13.11 mi
Time2:05:09
Pace9:33 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:55:28
Pace8:48 /mi
📊Negative Split: 7.7% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:51:1130:299:4930:29
9:49
-
10K
6.21 mi12:20:581:00:169:4229:47
9:35
-0:14
15K
9.32 mi12:50:021:29:209:3529:04
9:21
-0:14
20K
12.43 mi13:19:311:58:499:3429:29
9:29
+0:08
Half
13.11 mi13:25:512:05:099:336:20
9:17
-0:12
25K
15.53 mi13:48:352:27:539:3122:44
9:23
+0:06
30K
18.64 mi14:17:382:56:569:2929:03
9:21
-0:02
20M
20.00 mi14:29:383:08:569:2712:00
8:50
-0:31
21M
21.00 mi14:38:463:18:049:269:08
9:08
+0:18
35K
21.75 mi14:44:463:24:049:236:00
8:01
-1:07
23M
23.00 mi14:55:023:34:209:1910:16
8:12
+0:11
24M
24.00 mi15:02:533:42:119:157:51
7:51
-0:21
40K
24.85 mi15:09:533:49:119:137:00
8:11
+0:20
25.2M
25.20 mi15:12:483:52:069:132:55
8:27
+0:16
Finish
26.22 mi15:21:194:00:379:118:31
8:21
-0:06

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

7:51 /mi

Average Pace

9:11 /mi

Slowest Pace

9:49 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

42:33

18% of race

Time at Steady Pace

1:48:19

45% of race

Time at Slower Pace

1:29:45

37% of race

Average Pace: 9:11 /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 mi11:51:1130:299:4930:29
9:49
#22948
10K
6.21 mi12:20:581:00:169:4229:47
9:35
#22898
15K
9.32 mi12:50:021:29:209:3529:04
9:21
#22541
20K
12.43 mi13:19:311:58:499:3429:29
9:29
#22285
Half
13.11 mi13:25:512:05:099:336:20
9:17
#22238
25K
15.53 mi13:48:352:27:539:3122:44
9:23
#21950
30K
18.64 mi14:17:382:56:569:2929:03
9:21
#21456
20M
20.00 mi14:29:383:08:569:2712:00
8:50
#21106
21M
21.00 mi14:38:463:18:049:269:08
9:08
#20798
35K
21.75 mi14:44:463:24:049:236:00
8:01
#20573
23M
23.00 mi14:55:023:34:209:1910:16
8:12
#20195
24M
24.00 mi15:02:533:42:119:157:51
7:51
#19886
40K
24.85 mi15:09:533:49:119:137:00
8:11
#19662
25.2M
25.20 mi15:12:483:52:069:132:55
8:27
#19544
Finish
26.22 mi15:21:194:00:379:118:31
8:21
#19412
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi22948135671356721821(Top 82%)13114(Top 86%)13114(Top 248%)
10K6.21 mi3.10 mi22898+5013574-713574-722744(Top 85%)13512(Top 89%)13512(Top 256%)
15K9.32 mi3.11 mi22541+35713406+16813406+16821821(Top 82%)13114(Top 86%)13114(Top 248%)
20K12.43 mi3.11 mi22285+25613288+11813288+11821517(Top 81%)12964(Top 85%)12964(Top 245%)
Half13.11 mi0.68 mi22238+4713262+2613262+2621404(Top 80%)12908(Top 85%)12908(Top 244%)
25K15.53 mi2.42 mi21950+28813130+13213130+13220425(Top 77%)12458(Top 82%)12458(Top 236%)
30K18.64 mi3.11 mi21456+49412901+22912901+22918822(Top 71%)11708(Top 77%)11708(Top 222%)
20M20.00 mi1.36 mi21106+35012722+17912722+17915608(Top 59%)10259(Top 68%)10259(Top 194%)
21M21.00 mi1.00 mi20798+30812587+13512587+13514122(Top 53%)9562(Top 63%)9562(Top 181%)
35K21.75 mi0.75 mi20573+22512476+11112476+11112274(Top 46%)8692(Top 57%)8692(Top 164%)
23M23.00 mi1.25 mi20195+37812296+18012296+18011190(Top 42%)8073(Top 53%)8073(Top 153%)
24M24.00 mi1.00 mi19886+30912160+13612160+13610161(Top 38%)7495(Top 49%)7495(Top 142%)
40K24.85 mi0.85 mi19662+22412056+10412056+10411272(Top 42%)7977(Top 53%)7977(Top 151%)
25.2M25.20 mi0.35 mi19544+11812003+5312003+539269(Top 35%)6929(Top 46%)6929(Top 131%)
Finish26.22 mi1.02 mi19412+13211944+5911944+5914456(Top 54%)9476(Top 62%)9476(Top 179%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 82%
×21stories
+97ft-345ft

Overall

21821

Males

13114

M18-39

13114

5K→10K

3.1 - 6.2 mi

Top 85%
×5stories
+79ft-138ft

Overall

22744

Males

13512

M18-39

13512

10K→15K

6.2 - 9.3 mi

Top 82%
×3stories
+67ft-78ft

Overall

21821

Males

13114

M18-39

13114

15K→20K

9.3 - 12.4 mi

Top 81%
×5stories
+106ft-86ft

Overall

21517

Males

12964

M18-39

12964

20K→Half

12.4 - 13.1 mi

Top 80%
×2stories
+19ft-37ft

Overall

21404

Males

12908

M18-39

12908

Half→25K

13.1 - 15.5 mi

Top 77%
×4stories
+66ft-88ft

Overall

20425

Males

12458

M18-39

12458

25K→30K

15.5 - 18.6 mi

Top 71%
×9stories
+181ft-148ft

Overall

18822

Males

11708

M18-39

11708

30K→20M

18.6 - 20.0 mi

Top 59%
×5stories
+64ft-50ft

Overall

15608

Males

10259

M18-39

10259

20M→21M

20.0 - 21.0 mi

Top 53%
×8stories
+106ft-24ft

Overall

14122

Males

9562

M18-39

9562

21M→35K

21.0 - 21.8 mi

Top 46%
×7stories
+17ft-86ft

Overall

12274

Males

8692

M18-39

8692

35K→23M

21.8 - 23.0 mi

Top 42%
×5stories
+23ft-63ft

Overall

11190

Males

8073

M18-39

8073

23M→24M

23.0 - 24.0 mi

Top 38%
×6stories
+12ft-82ft

Overall

10161

Males

7495

M18-39

7495

24M→40K

24.0 - 24.9 mi

Top 42%
×1story
+6ft-20ft

Overall

11272

Males

7977

M18-39

7977

40K→25.2M

24.9 - 25.2 mi

Top 35%
×1story
+13ft-16ft

Overall

9269

Males

6929

M18-39

6929

25.2M→Finish

25.2 - 26.2 mi

Top 54%
×2stories
+22ft-21ft

Overall

14456

Males

9476

M18-39

9476

Passing Analysis

Category:
Athletes Passed
3816
Passed By
280
Net Change
+3536
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#22948
5K → 10K258208+50#22948#22898
10K → 15K38528+357#22898#22541
15K → 20K28327+256#22541#22285
20K → Half525+47#22285#22238
Half → 25K2946+288#22238#21950
25K → 30K4951+494#21950#21456
30K → 20M3500+350#21456#21106
20M → 21M3080+308#21106#20798
21M → 35K2250+225#20798#20573
35K → 23M3780+378#20573#20195
23M → 24M3090+309#20195#19886
24M → 40K2240+224#19886#19662
40K → 25.2M1180+118#19662#19544
25.2M → Finish1375+132#19544#19412
TOTALS3816280+3536
📊

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