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BOSTON MARATHON 2023

Brian Nielsen

Bib: 11073•M

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 32%
Gender (Male)
#0 / 15176
Top 47%
Masters (Masters Men)
#0 / 9891
Top 35%
Division (M55-59)
#0 / 1422
Top 16%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
24:02
Rank: #11754
Start → 5K
24:02 | 7:44/mi
10K· 6.21 mi
47:09
Rank: #10801 (+953)
5K → 10K
23:07 | 7:26/mi
15K· 9.32 mi
1:10:26
Rank: #10554 (+247)
10K → 15K
23:17 | 7:30/mi
20K· 12.43 mi
1:33:49
Rank: #10264 (+290)
15K → 20K
23:23 | 7:32/mi
Half· 13.11 mi
1:38:55
Rank: #10242 (+22)
20K → Half
5:06 | 7:29/mi
25K· 15.53 mi
1:57:18
Rank: #10048 (+194)
Half → 25K
18:23 | 7:35/mi
30K· 18.64 mi
2:21:16
Rank: #9799 (+249)
25K → 30K
23:58 | 7:43/mi
20M
2:31:43
Rank: #9636 (+163)
30K → 20M
10:27 | 7:41/mi
21M
2:39:40
Rank: #9455 (+181)
20M → 21M
7:57 | 7:57/mi
35K· 21.75 mi
2:45:09
Rank: #9347 (+108)
21M → 35K
5:29 | 7:20/mi
23M
2:54:36
Rank: #9162 (+185)
35K → 23M
9:27 | 7:33/mi
24M
3:01:55
Rank: #9021 (+141)
23M → 24M
7:19 | 7:19/mi
40K· 24.85 mi
3:08:07
Rank: #8852 (+169)
24M → 40K
6:12 | 7:15/mi
25.2M
3:10:46
Rank: #8752 (+100)
40K → 25.2M
2:39 | 7:41/mi
Finish· 26.22 mi
3:17:53
Rank: #8582 (+170)
25.2M → Finish
7:07 | 6:59/mi

The Course

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Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:38:55
Pace7:33 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:38:58
Pace7:33 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:50:5024:027:4424:02
7:44
-
10K
6.21 mi11:13:5747:097:3523:07
7:26
-0:18
15K
9.32 mi11:37:141:10:267:3323:17
7:30
+0:04
20K
12.43 mi12:00:371:33:497:3323:23
7:32
+0:02
Half
13.11 mi12:05:431:38:557:335:06
7:29
-0:03
25K
15.53 mi12:24:061:57:187:3318:23
7:35
+0:06
30K
18.64 mi12:48:042:21:167:3523:58
7:43
+0:08
20M
20.00 mi12:58:312:31:437:3510:27
7:41
-0:02
21M
21.00 mi13:06:282:39:407:367:57
7:57
+0:16
35K
21.75 mi13:11:572:45:097:365:29
7:20
-0:37
23M
23.00 mi13:21:242:54:367:359:27
7:33
+0:13
24M
24.00 mi13:28:433:01:557:357:19
7:19
-0:14
40K
24.85 mi13:34:553:08:077:346:12
7:15
-0:04
25.2M
25.20 mi13:37:343:10:467:342:39
7:41
+0:26
Finish
26.22 mi13:44:413:17:537:337:07
6:59
-0:42

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

6:59 /mi

Average Pace

7:33 /mi

Slowest Pace

7:57 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:08:50

65% of race

Time at Steady Pace

1:09:03

35% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 7:33 /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 mi10:50:5024:027:4424:02
7:44
#11754
10K
6.21 mi11:13:5747:097:3523:07
7:26
#10801
15K
9.32 mi11:37:141:10:267:3323:17
7:30
#10554
20K
12.43 mi12:00:371:33:497:3323:23
7:32
#10264
Half
13.11 mi12:05:431:38:557:335:06
7:29
#10242
25K
15.53 mi12:24:061:57:187:3318:23
7:35
#10048
30K
18.64 mi12:48:042:21:167:3523:58
7:43
#9799
20M
20.00 mi12:58:312:31:437:3510:27
7:41
#9636
21M
21.00 mi13:06:282:39:407:367:57
7:57
#9455
35K
21.75 mi13:11:572:45:097:365:29
7:20
#9347
23M
23.00 mi13:21:242:54:367:359:27
7:33
#9162
24M
24.00 mi13:28:433:01:557:357:19
7:19
#9021
40K
24.85 mi13:34:553:08:077:346:12
7:15
#8852
25.2M
25.20 mi13:37:343:10:467:342:39
7:41
#8752
Finish
26.22 mi13:44:413:17:537:337:07
6:59
#8582
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM55-59Seg. OverallSeg. MalesSeg. M55-59
5K3.11 mi3.11 mi117549010901010114(Top 38%)8201(Top 54%)8201(Top 577%)
10K6.21 mi3.10 mi10801+9538558+4528558+4529962(Top 37%)8146(Top 54%)8146(Top 573%)
15K9.32 mi3.11 mi10554+2478447+1118447+11110114(Top 38%)8201(Top 54%)8201(Top 577%)
20K12.43 mi3.11 mi10264+2908292+1558292+1559496(Top 36%)7794(Top 51%)7794(Top 548%)
Half13.11 mi0.68 mi10242+228277+158277+159947(Top 37%)8057(Top 53%)8057(Top 567%)
25K15.53 mi2.42 mi10048+1948150+1278150+1279386(Top 35%)7652(Top 50%)7652(Top 538%)
30K18.64 mi3.11 mi9799+2497984+1667984+1668738(Top 33%)7120(Top 47%)7120(Top 501%)
20M20.00 mi1.36 mi9636+1637855+1297855+1298092(Top 30%)6652(Top 44%)6652(Top 468%)
21M21.00 mi1.00 mi9455+1817726+1297726+1297030(Top 26%)5886(Top 39%)5886(Top 414%)
35K21.75 mi0.75 mi9347+1087642+847642+847324(Top 28%)6097(Top 40%)6097(Top 429%)
23M23.00 mi1.25 mi9162+1857510+1327510+1326722(Top 25%)5653(Top 37%)5653(Top 398%)
24M24.00 mi1.00 mi9021+1417406+1047406+1046492(Top 24%)5422(Top 36%)5422(Top 381%)
40K24.85 mi0.85 mi8852+1697278+1287278+1285170(Top 19%)4466(Top 29%)4466(Top 314%)
25.2M25.20 mi0.35 mi8752+1007210+687210+684828(Top 18%)4181(Top 28%)4181(Top 294%)
Finish26.22 mi1.02 mi8582+1707097+1137097+1135120(Top 19%)4355(Top 29%)4355(Top 306%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 38%
×21stories
+97ft-345ft

Overall

10114

Males

8201

M55-59

8201

5K→10K

3.1 - 6.2 mi

Top 37%
×5stories
+79ft-138ft

Overall

9962

Males

8146

M55-59

8146

10K→15K

6.2 - 9.3 mi

Top 38%
×3stories
+67ft-78ft

Overall

10114

Males

8201

M55-59

8201

15K→20K

9.3 - 12.4 mi

Top 36%
×5stories
+106ft-86ft

Overall

9496

Males

7794

M55-59

7794

20K→Half

12.4 - 13.1 mi

Top 37%
×2stories
+19ft-37ft

Overall

9947

Males

8057

M55-59

8057

Half→25K

13.1 - 15.5 mi

Top 35%
×4stories
+66ft-88ft

Overall

9386

Males

7652

M55-59

7652

25K→30K

15.5 - 18.6 mi

Top 33%
×9stories
+181ft-148ft

Overall

8738

Males

7120

M55-59

7120

30K→20M

18.6 - 20.0 mi

Top 30%
×5stories
+64ft-50ft

Overall

8092

Males

6652

M55-59

6652

20M→21M

20.0 - 21.0 mi

Top 26%
×8stories
+106ft-24ft

Overall

7030

Males

5886

M55-59

5886

21M→35K

21.0 - 21.8 mi

Top 28%
×7stories
+17ft-86ft

Overall

7324

Males

6097

M55-59

6097

35K→23M

21.8 - 23.0 mi

Top 25%
×5stories
+23ft-63ft

Overall

6722

Males

5653

M55-59

5653

23M→24M

23.0 - 24.0 mi

Top 24%
×6stories
+12ft-82ft

Overall

6492

Males

5422

M55-59

5422

24M→40K

24.0 - 24.9 mi

Top 19%
×1story
+6ft-20ft

Overall

5170

Males

4466

M55-59

4466

40K→25.2M

24.9 - 25.2 mi

Top 18%
×1story
+13ft-16ft

Overall

4828

Males

4181

M55-59

4181

25.2M→Finish

25.2 - 26.2 mi

Top 19%
×2stories
+22ft-21ft

Overall

5120

Males

4355

M55-59

4355

Passing Analysis

Category:
Athletes Passed
3503*
Passed By
331
Net Change
+3172
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11754
5K → 10K100350+953#11754#10801
10K → 15K33285+247#10801#10554
15K → 20K322*32+290#10554#10264
20K → Half3816+22#10264#10242
Half → 25K23642+194#10242#10048
25K → 30K300*51+249#10048#9799
30K → 20M18017+163#9799#9636
20M → 21M1876+181#9636#9455
21M → 35K1168+108#9455#9347
35K → 23M19611+185#9347#9162
23M → 24M1476+141#9162#9021
24M → 40K1712+169#9021#8852
40K → 25.2M1022+100#8852#8752
25.2M → Finish1733+170#8752#8582
TOTALS3503*331+3172

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

Passing Visuals

Category:
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🔥Passing Intensity

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing