Boston Marathon logo
BOSTON MARATHON 2023

Cosmos Ndebele

Bib: 2428•M

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 26622
Top 5%
Gender (Male)
#0 / 15176
Top 9%
Masters (Masters Men)
#0 / 9891
Top 2%
Division (M40-44)
#0 / 2241
Top 7%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
19:15
Rank: #1125
Start → 5K
19:15 | 6:12/mi
10K· 6.21 mi
38:13
Rank: #1083 (+42)
5K → 10K
18:58 | 6:06/mi
15K· 9.32 mi
57:03
Rank: #1016 (+67)
10K → 15K
18:50 | 6:04/mi
20K· 12.43 mi
1:16:33
Rank: #1055 (-39)
15K → 20K
19:30 | 6:17/mi
Half· 13.11 mi
1:20:43
Rank: #1052 (+3)
20K → Half
4:10 | 6:06/mi
25K· 15.53 mi
1:36:57
Rank: #1257 (-205)
Half → 25K
16:14 | 6:42/mi
30K· 18.64 mi
1:57:01
Rank: #1248 (+9)
25K → 30K
20:04 | 6:28/mi
20M
2:05:50
Rank: #1257 (-9)
30K → 20M
8:49 | 6:29/mi
21M
2:12:54
Rank: #1307 (-50)
20M → 21M
7:04 | 7:04/mi
35K· 21.75 mi
2:17:36
Rank: #1301 (+6)
21M → 35K
4:42 | 6:17/mi
23M
2:25:55
Rank: #1315 (-14)
35K → 23M
8:19 | 6:39/mi
24M
2:32:21
Rank: #1308 (+7)
23M → 24M
6:26 | 6:26/mi
40K· 24.85 mi
2:38:11
Rank: #1344 (-36)
24M → 40K
5:50 | 6:49/mi
25.2M
2:40:45
Rank: #1368 (-24)
40K → 25.2M
2:34 | 7:27/mi
Finish· 26.22 mi
2:47:43
Rank: #1437 (-69)
25.2M → Finish
6:58 | 6:50/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
Time1:20:43
Pace6:09 /mi
2nd Half
Distance13.11 mi
Time1:27:00
Pace6:38 /mi
📊Positive Split: 7.8% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:20:0219:156:1219:15
6:12
-
10K
6.21 mi10:39:0038:136:0918:58
6:06
-0:06
15K
9.32 mi10:57:5057:036:0718:50
6:04
-0:02
20K
12.43 mi11:17:201:16:336:1019:30
6:17
+0:13
Half
13.11 mi11:21:301:20:436:094:10
6:06
-0:11
25K
15.53 mi11:37:441:36:576:1416:14
6:42
+0:36
30K
18.64 mi11:57:481:57:016:1720:04
6:28
-0:14
20M
20.00 mi12:06:372:05:506:178:49
6:29
+0:01
21M
21.00 mi12:13:412:12:546:207:04
7:04
+0:35
35K
21.75 mi12:18:232:17:366:204:42
6:17
-0:47
23M
23.00 mi12:26:422:25:556:218:19
6:39
+0:22
24M
24.00 mi12:33:082:32:216:216:26
6:26
-0:13
40K
24.85 mi12:38:582:38:116:225:50
6:49
+0:23
25.2M
25.20 mi12:41:322:40:456:232:34
7:27
+0:38
Finish
26.22 mi12:48:302:47:436:246:58
6:50
-0:37

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

6:04 /mi

Average Pace

6:24 /mi

Slowest Pace

7:27 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:01:13

37% of race

Time at Steady Pace

1:07:50

40% of race

Time at Slower Pace

38:40

23% of race

Average Pace: 6:24 /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 mi10:20:0219:156:1219:15
6:12
#1125
10K
6.21 mi10:39:0038:136:0918:58
6:06
#1083
15K
9.32 mi10:57:5057:036:0718:50
6:04
#1016
20K
12.43 mi11:17:201:16:336:1019:30
6:17
#1055
Half
13.11 mi11:21:301:20:436:094:10
6:06
#1052
25K
15.53 mi11:37:441:36:576:1416:14
6:42
#1257
30K
18.64 mi11:57:481:57:016:1720:04
6:28
#1248
20M
20.00 mi12:06:372:05:506:178:49
6:29
#1257
21M
21.00 mi12:13:412:12:546:207:04
7:04
#1307
35K
21.75 mi12:18:232:17:366:204:42
6:17
#1301
23M
23.00 mi12:26:422:25:556:218:19
6:39
#1315
24M
24.00 mi12:33:082:32:216:216:26
6:26
#1308
40K
24.85 mi12:38:582:38:116:225:50
6:49
#1344
25.2M
25.20 mi12:41:322:40:456:232:34
7:27
#1368
Finish
26.22 mi12:48:302:47:436:246:58
6:50
#1437
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi112510631063858(Top 3%)811(Top 5%)811(Top 36%)
10K6.21 mi3.10 mi1083+421026+371026+371071(Top 4%)1016(Top 7%)1016(Top 45%)
15K9.32 mi3.11 mi1016+67963+63963+63858(Top 3%)811(Top 5%)811(Top 36%)
20K12.43 mi3.11 mi1055-391002-391002-391308(Top 5%)1249(Top 8%)1249(Top 56%)
Half13.11 mi0.68 mi1052+3999+3999+31057(Top 4%)1009(Top 7%)1009(Top 45%)
25K15.53 mi2.42 mi1257-2051202-2031202-2033306(Top 12%)3138(Top 21%)3138(Top 140%)
30K18.64 mi3.11 mi1248+91193+91193+91399(Top 5%)1339(Top 9%)1339(Top 60%)
20M20.00 mi1.36 mi1257-91201-81201-81400(Top 5%)1335(Top 9%)1335(Top 60%)
21M21.00 mi1.00 mi1307-501248-471248-472434(Top 9%)2297(Top 15%)2297(Top 102%)
35K21.75 mi0.75 mi1301+61242+61242+61501(Top 6%)1425(Top 9%)1425(Top 64%)
23M23.00 mi1.25 mi1315-141255-131255-131918(Top 7%)1819(Top 12%)1819(Top 81%)
24M24.00 mi1.00 mi1308+71247+81247+81795(Top 7%)1691(Top 11%)1691(Top 75%)
40K24.85 mi0.85 mi1344-361281-341281-342901(Top 11%)2668(Top 18%)2668(Top 119%)
25.2M25.20 mi0.35 mi1368-241304-231304-233531(Top 13%)3159(Top 21%)3159(Top 141%)
Finish26.22 mi1.02 mi1437-691370-661370-664243(Top 16%)3719(Top 25%)3719(Top 166%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 3%
×21stories
+97ft-345ft

Overall

858

Males

811

M40-44

811

5K→10K

3.1 - 6.2 mi

Top 4%
×5stories
+79ft-138ft

Overall

1071

Males

1016

M40-44

1016

10K→15K

6.2 - 9.3 mi

Top 3%
×3stories
+67ft-78ft

Overall

858

Males

811

M40-44

811

15K→20K

9.3 - 12.4 mi

Top 5%
×5stories
+106ft-86ft

Overall

1308

Males

1249

M40-44

1249

20K→Half

12.4 - 13.1 mi

Top 4%
×2stories
+19ft-37ft

Overall

1057

Males

1009

M40-44

1009

Half→25K

13.1 - 15.5 mi

Top 12%
×4stories
+66ft-88ft

Overall

3306

Males

3138

M40-44

3138

25K→30K

15.5 - 18.6 mi

Top 5%
×9stories
+181ft-148ft

Overall

1399

Males

1339

M40-44

1339

30K→20M

18.6 - 20.0 mi

Top 5%
×5stories
+64ft-50ft

Overall

1400

Males

1335

M40-44

1335

20M→21M

20.0 - 21.0 mi

Top 9%
×8stories
+106ft-24ft

Overall

2434

Males

2297

M40-44

2297

21M→35K

21.0 - 21.8 mi

Top 6%
×7stories
+17ft-86ft

Overall

1501

Males

1425

M40-44

1425

35K→23M

21.8 - 23.0 mi

Top 7%
×5stories
+23ft-63ft

Overall

1918

Males

1819

M40-44

1819

23M→24M

23.0 - 24.0 mi

Top 7%
×6stories
+12ft-82ft

Overall

1795

Males

1691

M40-44

1691

24M→40K

24.0 - 24.9 mi

Top 11%
×1story
+6ft-20ft

Overall

2901

Males

2668

M40-44

2668

40K→25.2M

24.9 - 25.2 mi

Top 13%
×1story
+13ft-16ft

Overall

3531

Males

3159

M40-44

3159

25.2M→Finish

25.2 - 26.2 mi

Top 16%
×2stories
+22ft-21ft

Overall

4243

Males

3719

M40-44

3719

Passing Analysis

Category:
Athletes Passed
327
Passed By
639
Net Change
-312
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#1125
5K → 10K7533+42#1125#1083
10K → 15K769+67#1083#1016
15K → 20K1453-39#1016#1055
20K → Half63+3#1055#1052
Half → 25K1206-205#1052#1257
25K → 30K4435+9#1257#1248
30K → 20M1928-9#1248#1257
20M → 21M1161-50#1257#1307
21M → 35K1610+6#1307#1301
35K → 23M2337-14#1301#1315
23M → 24M2417+7#1315#1308
24M → 40K642-36#1308#1344
40K → 25.2M327-24#1344#1368
25.2M → Finish978-69#1368#1437
TOTALS327639-312
📊

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