Boston Marathon logo
BOSTON MARATHON 2023

Robert Brook

Bib: 327•M

DC

0:00
0:00
/ mi
Be the first to cheer!
Overall
#0 / 26622
Top 4%
Gender (Male)
#0 / 15176
Top 7%
Division (M18-39)
#0 / 5285
Top 17%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
17:37
Rank: #243
Start → 5K
17:37 | 5:40/mi
10K· 6.21 mi
35:21
Rank: #282 (-39)
5K → 10K
17:44 | 5:42/mi
15K· 9.32 mi
53:10
Rank: #280 (+2)
10K → 15K
17:49 | 5:44/mi
20K· 12.43 mi
1:11:07
Rank: #281 (-1)
15K → 20K
17:57 | 5:47/mi
Half· 13.11 mi
1:15:00
Rank: #281
20K → Half
3:53 | 5:42/mi
25K· 15.53 mi
1:28:58
Rank: #272 (+9)
Half → 25K
13:58 | 5:46/mi
30K· 18.64 mi
1:47:29
Rank: #277 (-5)
25K → 30K
18:31 | 5:58/mi
20M
1:55:48
Rank: #286 (-9)
30K → 20M
8:19 | 6:07/mi
21M
2:02:14
Rank: #286
20M → 21M
6:26 | 6:26/mi
35K· 21.75 mi
2:06:54
Rank: #303 (-17)
21M → 35K
4:40 | 6:14/mi
23M
2:20:51
Rank: #723 (-420)
35K → 23M
13:57 | 11:08/mi
24M
2:29:27
Rank: #930 (-207)
23M → 24M
8:36 | 8:36/mi
40K· 24.85 mi
2:36:03
Rank: #1064 (-134)
24M → 40K
6:36 | 7:43/mi
25.2M
2:38:35
Rank: #1076 (-12)
40K → 25.2M
2:32 | 7:21/mi
Finish· 26.22 mi
2:45:09
Rank: #1100 (-24)
25.2M → Finish
6:34 | 6:27/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
Time1:15:00
Pace5:43 /mi
2nd Half
Distance13.11 mi
Time1:30:09
Pace6:53 /mi
📊Positive Split: 20.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:17:4517:375:4017:37
5:40
-
10K
6.21 mi10:35:2935:215:4117:44
5:42
+0:02
15K
9.32 mi10:53:1853:105:4217:49
5:44
+0:02
20K
12.43 mi11:11:151:11:075:4317:57
5:47
+0:03
Half
13.11 mi11:15:081:15:005:433:53
5:42
-0:05
25K
15.53 mi11:29:061:28:585:4413:58
5:46
+0:04
30K
18.64 mi11:47:371:47:295:4618:31
5:58
+0:12
20M
20.00 mi11:55:561:55:485:478:19
6:07
+0:09
21M
21.00 mi12:02:222:02:145:496:26
6:26
+0:19
35K
21.75 mi12:07:022:06:545:504:40
6:14
-0:12
23M
23.00 mi12:20:592:20:516:0713:57
11:08
+4:54
24M
24.00 mi12:29:352:29:276:148:36
8:36
-2:32
40K
24.85 mi12:36:112:36:036:176:36
7:43
-0:53
25.2M
25.20 mi12:38:432:38:356:182:32
7:21
-0:22
Finish
26.22 mi12:45:172:45:096:186:34
6:27
-0:54

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

5:40 /mi

Average Pace

6:18 /mi

Slowest Pace

11:08 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

0:00

0% of race

Time at Steady Pace

2:13:28

81% of race

Time at Slower Pace

31:41

19% of race

Average Pace: 6:18 /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 mi10:17:4517:375:4017:37
5:40
#243
10K
6.21 mi10:35:2935:215:4117:44
5:42
#282
15K
9.32 mi10:53:1853:105:4217:49
5:44
#280
20K
12.43 mi11:11:151:11:075:4317:57
5:47
#281
Half
13.11 mi11:15:081:15:005:433:53
5:42
#281
25K
15.53 mi11:29:061:28:585:4413:58
5:46
#272
30K
18.64 mi11:47:371:47:295:4618:31
5:58
#277
20M
20.00 mi11:55:561:55:485:478:19
6:07
#286
21M
21.00 mi12:02:222:02:145:496:26
6:26
#286
35K
21.75 mi12:07:022:06:545:504:40
6:14
#303
23M
23.00 mi12:20:592:20:516:0713:57
11:08
#723
24M
24.00 mi12:29:352:29:276:148:36
8:36
#930
40K
24.85 mi12:36:112:36:036:176:36
7:43
#1064
25.2M
25.20 mi12:38:432:38:356:182:32
7:21
#1076
Finish
26.22 mi12:45:172:45:096:186:34
6:27
#1100
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi243243243297(Top 1%)265(Top 2%)265(Top 5%)
10K6.21 mi3.10 mi282-39255-12255-12322(Top 1%)288(Top 2%)288(Top 5%)
15K9.32 mi3.11 mi280+2252+3252+3297(Top 1%)265(Top 2%)265(Top 5%)
20K12.43 mi3.11 mi281-1253-1253-1279(Top 1%)251(Top 2%)251(Top 5%)
Half13.11 mi0.68 mi281253253283(Top 1%)261(Top 2%)261(Top 5%)
25K15.53 mi2.42 mi272+9244+9244+9228(Top 0.9%)205(Top 1%)205(Top 4%)
30K18.64 mi3.11 mi277-5247-3247-3338(Top 1%)311(Top 2%)311(Top 6%)
20M20.00 mi1.36 mi286-9255-8255-8521(Top 2%)487(Top 3%)487(Top 9%)
21M21.00 mi1.00 mi286257-2257-2547(Top 2%)513(Top 3%)513(Top 10%)
35K21.75 mi0.75 mi303-17272-15272-151347(Top 5%)1277(Top 8%)1277(Top 24%)
23M23.00 mi1.25 mi723-420681-409681-40922610(Top 85%)13199(Top 87%)13199(Top 250%)
24M24.00 mi1.00 mi930-207883-202883-20215014(Top 56%)9745(Top 64%)9745(Top 184%)
40K24.85 mi0.85 mi1064-1341012-1291012-1298039(Top 30%)6258(Top 41%)6258(Top 118%)
25.2M25.20 mi0.35 mi1076-121024-121024-123066(Top 12%)2789(Top 18%)2789(Top 53%)
Finish26.22 mi1.02 mi1100-241047-231047-232186(Top 8%)2026(Top 13%)2026(Top 38%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 1%
×21stories
+97ft-345ft

Overall

297

Males

265

M18-39

265

5K→10K

3.1 - 6.2 mi

Top 1%
×5stories
+79ft-138ft

Overall

322

Males

288

M18-39

288

10K→15K

6.2 - 9.3 mi

Top 1%
×3stories
+67ft-78ft

Overall

297

Males

265

M18-39

265

15K→20K

9.3 - 12.4 mi

Top 1%
×5stories
+106ft-86ft

Overall

279

Males

251

M18-39

251

20K→Half

12.4 - 13.1 mi

Top 1%
×2stories
+19ft-37ft

Overall

283

Males

261

M18-39

261

Half→25K

13.1 - 15.5 mi

Top 0.9%
×4stories
+66ft-88ft

Overall

228

Males

205

M18-39

205

25K→30K

15.5 - 18.6 mi

Top 1%
×9stories
+181ft-148ft

Overall

338

Males

311

M18-39

311

30K→20M

18.6 - 20.0 mi

Top 2%
×5stories
+64ft-50ft

Overall

521

Males

487

M18-39

487

20M→21M

20.0 - 21.0 mi

Top 2%
×8stories
+106ft-24ft

Overall

547

Males

513

M18-39

513

21M→35K

21.0 - 21.8 mi

Top 5%
×7stories
+17ft-86ft

Overall

1347

Males

1277

M18-39

1277

35K→23M

21.8 - 23.0 mi

Top 85%
×5stories
+23ft-63ft

Overall

22610

Males

13199

M18-39

13199

23M→24M

23.0 - 24.0 mi

Top 56%
×6stories
+12ft-82ft

Overall

15014

Males

9745

M18-39

9745

24M→40K

24.0 - 24.9 mi

Top 30%
×1story
+6ft-20ft

Overall

8039

Males

6258

M18-39

6258

40K→25.2M

24.9 - 25.2 mi

Top 12%
×1story
+13ft-16ft

Overall

3066

Males

2789

M18-39

2789

25.2M→Finish

25.2 - 26.2 mi

Top 8%
×2stories
+22ft-21ft

Overall

2186

Males

2026

M18-39

2026

Passing Analysis

Category:
Athletes Passed
78
Passed By
935
Net Change
-857
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#243
5K → 10K1251-39#243#282
10K → 15K1210+2#282#280
15K → 20K89-1#280#281
20K → Half220#281#281
Half → 25K112+9#281#272
25K → 30K1015-5#272#277
30K → 20M110-9#277#286
20M → 21M880#286#286
21M → 35K017-17#286#303
35K → 23M0420-420#303#723
23M → 24M0207-207#723#930
24M → 40K1135-134#930#1064
40K → 25.2M214-12#1064#1076
25.2M → Finish1135-24#1076#1100
TOTALS78935-857
📊

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