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BOSTON MARATHON 2026

Zack Spencer

Bib: 2682•M

CA

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0:00
0:00
/ mi
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Overall
#0 / 29021
Top 19%
Gender (Male)
#0 / 16340
Top 30%
Age Group (M18-39)
#0 / 5723
Race Day Weather
51°/41°F
overcast clouds

Race Timeline and Course Information

Your journey through the course with elevation, pacing, and checkpoint details

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K
19:22
3.11 mi
Rank: #2286
Start → 5K
19:22 | 6:15/mi
10K
38:29
6.21 mi
Rank: #2164 (+122)
5K → 10K
19:07 | 6:10/mi
15K
57:46
9.32 mi
Rank: #2197 (-33)
10K → 15K
19:17 | 6:13/mi
20K
1:17:19
12.43 mi
Rank: #2242 (-45)
15K → 20K
19:33 | 6:18/mi
HALF
1:21:34
13.11 mi
Rank: #2258 (-16)
20K → HALF
4:15 | 6:15/mi
25K
1:37:05
15.53 mi
Rank: #2322 (-64)
HALF → 25K
15:31 | 6:24/mi
30K
1:58:20
18.64 mi
Rank: #2676 (-354)
25K → 30K
21:15 | 6:51/mi
20M
2:08:06
20.00 mi
Rank: #2926 (-250)
30K → 20M
9:46 | 7:12/mi
21M
2:15:56
21.00 mi
Rank: #3139 (-213)
20M → 21M
7:50 | 7:50/mi
35K
2:21:46
21.75 mi
Rank: #3429 (-290)
21M → 35K
5:50 | 7:48/mi
23M
2:32:39
23.00 mi
Rank: #4099 (-670)
35K → 23M
10:53 | 8:42/mi
24M
2:41:36
24.00 mi
Rank: #4802 (-703)
23M → 24M
8:57 | 8:57/mi
40K
2:49:04
24.85 mi
Rank: #5328 (-526)
24M → 40K
7:28 | 8:44/mi
25.2M
2:51:52
25.20 mi
Rank: #5383 (-55)
40K → 25.2M
2:48 | 8:08/mi
FINISH
2:59:02
26.22 mi
Rank: #5501 (-118)
25.2M → FINISH
7:10 | 7:02/mi

Splits & Pacing

Detailed breakdown of your race performance at each timing point

Half Splits

1st HalfFaster
via HALF
Distance13.11 mi
Time1:21:34
Pace6:14 /mi
2nd Half
Distance13.11 mi
Time1:37:28
Pace7:27 /mi
📊Positive Split: 19.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:20:0919:226:1519:22
6:15
-
10K
6.21 mi10:39:1638:296:1219:07
6:10
-0:05
15K
9.32 mi10:58:3357:466:1219:17
6:13
+0:03
20K
12.43 mi11:18:061:17:196:1419:33
6:18
+0:05
HALF
13.11 mi11:22:211:21:346:144:15
6:15
-0:03
25K
15.53 mi11:37:521:37:056:1515:31
6:24
+0:09
30K
18.64 mi11:59:071:58:206:2121:15
6:51
+0:27
20M
20.00 mi12:08:532:08:066:259:46
7:12
+0:21
21M
21.00 mi12:16:432:15:566:297:50
7:50
+0:38
35K
21.75 mi12:22:332:21:466:325:50
7:48
-0:02
23M
23.00 mi12:33:262:32:396:3910:53
8:42
+0:54
24M
24.00 mi12:42:232:41:366:458:57
8:57
+0:15
40K
24.85 mi12:49:512:49:046:497:28
8:44
-0:13
25.2M
25.20 mi12:52:392:51:526:502:48
8:08
-0:36
FINISH
26.22 mi12:59:492:59:026:507:10
7:02
-1:06

Checkpoint Splits Visualizations

Explore your race data through different visual perspectives. Scroll to discover each visualization.

📈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

6:10 /mi

Average Pace

6:50 /mi

Slowest Pace

8:57 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Bar length shows time spent in each segment. Colors mark your faster to slower segments, relative to your own pace.

Time at Faster Pace

1:37:05

54% of race

Time at Steady Pace

38:11

21% of race

Time at Slower Pace

43:46

24% of race

Average Pace: 6:50 /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

Enhanced split table showing pace trends through mini sparkline visualizations.

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi10:20:0919:226:1519:22
6:15
#2286
10K
6.21 mi10:39:1638:296:1219:07
6:10
#2164
15K
9.32 mi10:58:3357:466:1219:17
6:13
#2197
20K
12.43 mi11:18:061:17:196:1419:33
6:18
#2242
HALF
13.11 mi11:22:211:21:346:144:15
6:15
#2258
25K
15.53 mi11:37:521:37:056:1515:31
6:24
#2322
30K
18.64 mi11:59:071:58:206:2121:15
6:51
#2676
20M
20.00 mi12:08:532:08:066:259:46
7:12
#2926
21M
21.00 mi12:16:432:15:566:297:50
7:50
#3139
35K
21.75 mi12:22:332:21:466:325:50
7:48
#3429
23M
23.00 mi12:33:262:32:396:3910:53
8:42
#4099
24M
24.00 mi12:42:232:41:366:458:57
8:57
#4802
40K
24.85 mi12:49:512:49:046:497:28
8:44
#5328
25.2M
25.20 mi12:52:392:51:526:502:48
8:08
#5383
FINISH
26.22 mi12:59:492:59:026:507:10
7:02
#5501
Faster pace
Steady pace
Slower pace

Rankings

Your position at each checkpoint and how you ranked in each segment

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi2286220222022321(Top 8%)2236(Top 14%)2236(Top 39%)
10K6.21 mi3.10 mi2164+1222087+1152087+1152051(Top 7%)1978(Top 12%)1978(Top 35%)
15K9.32 mi3.11 mi2197-332120-332120-332321(Top 8%)2236(Top 14%)2236(Top 39%)
20K12.43 mi3.11 mi2242-452163-432163-432523(Top 9%)2430(Top 15%)2430(Top 42%)
HALF13.11 mi0.68 mi2258-162179-162179-162727(Top 9%)2631(Top 16%)2631(Top 46%)
25K15.53 mi2.42 mi2322-642242-632242-632887(Top 10%)2773(Top 17%)2773(Top 48%)
30K18.64 mi3.11 mi2676-3542572-3302572-3304689(Top 16%)4283(Top 26%)4283(Top 75%)
20M20.00 mi1.36 mi2926-2502808-2362808-2366853(Top 24%)5803(Top 36%)5803(Top 101%)
21M21.00 mi1.00 mi3139-2133004-1963004-1968700(Top 30%)6757(Top 41%)6757(Top 118%)
35K21.75 mi0.75 mi3429-2903267-2633267-26312951(Top 45%)8840(Top 54%)8840(Top 154%)
23M23.00 mi1.25 mi4099-6703841-5743841-57416848(Top 58%)10437(Top 64%)10437(Top 182%)
24M24.00 mi1.00 mi4802-7034429-5884429-58819204(Top 66%)11509(Top 70%)11509(Top 201%)
40K24.85 mi0.85 mi5328-5264840-4114840-41116979(Top 59%)10397(Top 64%)10397(Top 182%)
25.2M25.20 mi0.35 mi5383-554879-394879-398973(Top 31%)6575(Top 40%)6575(Top 115%)
FINISH26.22 mi1.02 mi5501-1184955-764955-767790(Top 27%)5932(Top 36%)5932(Top 104%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 8%
×21
+97ft-345ft

Overall

2321

Males

2236

M18-39

2236

5K→10K

3.1 - 6.2 mi

Top 7%
×5
+79ft-138ft

Overall

2051

Males

1978

M18-39

1978

10K→15K

6.2 - 9.3 mi

Top 8%
×3
+67ft-78ft

Overall

2321

Males

2236

M18-39

2236

15K→20K

9.3 - 12.4 mi

Top 9%
×5
+106ft-86ft

Overall

2523

Males

2430

M18-39

2430

20K→HALF

12.4 - 13.1 mi

Top 9%
×2
+19ft-37ft

Overall

2727

Males

2631

M18-39

2631

HALF→25K

13.1 - 15.5 mi

Top 10%
×4
+66ft-88ft

Overall

2887

Males

2773

M18-39

2773

25K→30K

15.5 - 18.6 mi

Top 16%
×9
+181ft-148ft

Overall

4689

Males

4283

M18-39

4283

30K→20M

18.6 - 20.0 mi

Top 24%
×5
+64ft-50ft

Overall

6853

Males

5803

M18-39

5803

20M→21M

20.0 - 21.0 mi

Top 30%
×8
+106ft-24ft

Overall

8700

Males

6757

M18-39

6757

21M→35K

21.0 - 21.8 mi

Top 45%
×7
+17ft-86ft

Overall

12951

Males

8840

M18-39

8840

35K→23M

21.8 - 23.0 mi

Top 58%
×5
+23ft-63ft

Overall

16848

Males

10437

M18-39

10437

23M→24M

23.0 - 24.0 mi

Top 66%
×6
+12ft-82ft

Overall

19204

Males

11509

M18-39

11509

24M→40K

24.0 - 24.9 mi

Top 59%
×1
+6ft-20ft

Overall

16979

Males

10397

M18-39

10397

40K→25.2M

24.9 - 25.2 mi

Top 31%
×1
+13ft-16ft

Overall

8973

Males

6575

M18-39

6575

25.2M→FINISH

25.2 - 26.2 mi

Top 27%
×2
+22ft-21ft

Overall

7790

Males

5932

M18-39

5932

Passing

Athletes you passed and who passed you throughout the race

Passing Analysis

Category:
Athletes Passed
405
Passed By
3620
Net Change
-3215
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#2286
5K → 10K17149+122#2286#2164
10K → 15K5083-33#2164#2197
15K → 20K3580-45#2197#2242
20K → HALF218-16#2242#2258
HALF → 25K3195-64#2258#2322
25K → 30K20374-354#2322#2676
30K → 20M15265-250#2676#2926
20M → 21M11224-213#2926#3139
21M → 35K5295-290#3139#3429
35K → 23M8678-670#3429#4099
23M → 24M4707-703#4099#4802
24M → 40K9535-526#4802#5328
40K → 25.2M1166-55#5328#5383
25.2M → FINISH33151-118#5383#5501
TOTALS4053620-3215
📊

Passing Analysis Visualizations

Explore your passing analysis through 5 different visualizations. Scroll to discover each one.

Time:
Category:

📈Position Graph

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🎨Heatmap Timeline

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Qualifying & Age Grade

See how your performance stacks up against qualifying standards

OTQ

Olympic Trials Qualifying analysis available

Activity Data

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing