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BOSTON MARATHON 2025

Alex Chen

Bib: 4629•M

MA

0:00
0:00
/ mi
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Overall
#0 / 28404
Top 11%
Gender (Male)
#0 / 16105
Top 18%
Division (M18-39)
#0 / 5642
Top 40%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
19:12
Rank: #1746
Start → 5K
19:12 | 6:11/mi
10K· 6.21 mi
38:28
Rank: #1827 (-81)
5K → 10K
19:16 | 6:12/mi
15K· 9.32 mi
57:56
Rank: #1919 (-92)
10K → 15K
19:28 | 6:16/mi
20K· 12.43 mi
1:17:50
Rank: #2070 (-151)
15K → 20K
19:54 | 6:24/mi
Half· 13.11 mi
1:22:10
Rank: #2107 (-37)
20K → Half
4:20 | 6:21/mi
25K· 15.53 mi
1:38:07
Rank: #2269 (-162)
Half → 25K
15:57 | 6:35/mi
30K· 18.64 mi
1:59:20
Rank: #2456 (-187)
25K → 30K
21:13 | 6:50/mi
20M
2:08:43
Rank: #2489 (-33)
30K → 20M
9:23 | 6:54/mi
21M
2:16:07
Rank: #2560 (-71)
20M → 21M
7:24 | 7:24/mi
35K· 21.75 mi
2:21:09
Rank: #2590 (-30)
21M → 35K
5:02 | 6:44/mi
23M
2:30:24
Rank: #2740 (-150)
35K → 23M
9:15 | 7:23/mi
24M
2:37:45
Rank: #2839 (-99)
23M → 24M
7:21 | 7:21/mi
40K· 24.85 mi
2:44:10
Rank: #2930 (-91)
24M → 40K
6:25 | 7:30/mi
25.2M
2:47:05
Rank: #2990 (-60)
40K → 25.2M
2:55 | 8:27/mi
Finish· 26.22 mi
2:54:15
Rank: #3047 (-57)
25.2M → Finish
7:10 | 7:02/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:22:10
Pace6:16 /mi
2nd Half
Distance13.11 mi
Time1:32:05
Pace7:01 /mi
📊Positive Split: 12.1% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:22:2919:126:1119:12
6:11
-
10K
6.21 mi10:41:4538:286:1119:16
6:12
+0:01
15K
9.32 mi11:01:1357:566:1319:28
6:16
+0:04
20K
12.43 mi11:21:071:17:506:1619:54
6:24
+0:08
Half
13.11 mi11:25:271:22:106:164:20
6:21
-0:03
25K
15.53 mi11:41:241:38:076:1915:57
6:35
+0:14
30K
18.64 mi12:02:371:59:206:2421:13
6:50
+0:15
20M
20.00 mi12:12:002:08:436:269:23
6:54
+0:04
21M
21.00 mi12:19:242:16:076:297:24
7:24
+0:30
35K
21.75 mi12:24:262:21:096:295:02
6:44
-0:40
23M
23.00 mi12:33:412:30:246:329:15
7:23
+0:39
24M
24.00 mi12:41:022:37:456:347:21
7:21
-0:02
40K
24.85 mi12:47:272:44:106:366:25
7:30
+0:09
25.2M
25.20 mi12:50:222:47:056:382:55
8:27
+0:57
Finish
26.22 mi12:57:322:54:156:397:10
7:02
-1:25

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

6:11 /mi

Average Pace

6:39 /mi

Slowest Pace

8:27 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:22:10

47% of race

Time at Steady Pace

58:45

34% of race

Time at Slower Pace

33:20

19% of race

Average Pace: 6:39 /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 mi10:22:2919:126:1119:12
6:11
#1746
10K
6.21 mi10:41:4538:286:1119:16
6:12
#1827
15K
9.32 mi11:01:1357:566:1319:28
6:16
#1919
20K
12.43 mi11:21:071:17:506:1619:54
6:24
#2070
Half
13.11 mi11:25:271:22:106:164:20
6:21
#2107
25K
15.53 mi11:41:241:38:076:1915:57
6:35
#2269
30K
18.64 mi12:02:371:59:206:2421:13
6:50
#2456
20M
20.00 mi12:12:002:08:436:269:23
6:54
#2489
21M
21.00 mi12:19:242:16:076:297:24
7:24
#2560
35K
21.75 mi12:24:262:21:096:295:02
6:44
#2590
23M
23.00 mi12:33:412:30:246:329:15
7:23
#2740
24M
24.00 mi12:41:022:37:456:347:21
7:21
#2839
40K
24.85 mi12:47:272:44:106:366:25
7:30
#2930
25.2M
25.20 mi12:50:222:47:056:382:55
8:27
#2990
Finish
26.22 mi12:57:322:54:156:397:10
7:02
#3047
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM18-39Seg. OverallSeg. MalesSeg. M18-39
5K3.11 mi3.11 mi1746165816582181(Top 8%)2079(Top 13%)2079(Top 37%)
10K6.21 mi3.10 mi1827-811737-791737-791930(Top 7%)1836(Top 11%)1836(Top 33%)
15K9.32 mi3.11 mi1919-921825-881825-882181(Top 8%)2079(Top 13%)2079(Top 37%)
20K12.43 mi3.11 mi2070-1511976-1511976-1512547(Top 9%)2428(Top 15%)2428(Top 43%)
Half13.11 mi0.68 mi2107-372011-352011-352775(Top 10%)2651(Top 16%)2651(Top 47%)
25K15.53 mi2.42 mi2269-1622166-1552166-1553319(Top 12%)3138(Top 19%)3138(Top 56%)
30K18.64 mi3.11 mi2456-1872343-1772343-1773608(Top 13%)3342(Top 21%)3342(Top 59%)
20M20.00 mi1.36 mi2489-332374-312374-313525(Top 12%)3247(Top 20%)3247(Top 58%)
21M21.00 mi1.00 mi2560-712441-672441-674090(Top 14%)3688(Top 23%)3688(Top 65%)
35K21.75 mi0.75 mi2590-302466-252466-253638(Top 13%)3285(Top 20%)3285(Top 58%)
23M23.00 mi1.25 mi2740-1502603-1372603-1375939(Top 21%)4917(Top 31%)4917(Top 87%)
24M24.00 mi1.00 mi2839-992688-852688-856671(Top 23%)5318(Top 33%)5318(Top 94%)
40K24.85 mi0.85 mi2930-912770-822770-826796(Top 24%)5301(Top 33%)5301(Top 94%)
25.2M25.20 mi0.35 mi2990-602823-532823-538414(Top 30%)6099(Top 38%)6099(Top 108%)
Finish26.22 mi1.02 mi3047-572872-492872-495896(Top 21%)4654(Top 29%)4654(Top 82%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 8%
×21stories
+97ft-345ft

Overall

2181

Males

2079

M18-39

2079

5K→10K

3.1 - 6.2 mi

Top 7%
×5stories
+79ft-138ft

Overall

1930

Males

1836

M18-39

1836

10K→15K

6.2 - 9.3 mi

Top 8%
×3stories
+67ft-78ft

Overall

2181

Males

2079

M18-39

2079

15K→20K

9.3 - 12.4 mi

Top 9%
×5stories
+106ft-86ft

Overall

2547

Males

2428

M18-39

2428

20K→Half

12.4 - 13.1 mi

Top 10%
×2stories
+19ft-37ft

Overall

2775

Males

2651

M18-39

2651

Half→25K

13.1 - 15.5 mi

Top 12%
×4stories
+66ft-88ft

Overall

3319

Males

3138

M18-39

3138

25K→30K

15.5 - 18.6 mi

Top 13%
×9stories
+181ft-148ft

Overall

3608

Males

3342

M18-39

3342

30K→20M

18.6 - 20.0 mi

Top 12%
×5stories
+64ft-50ft

Overall

3525

Males

3247

M18-39

3247

20M→21M

20.0 - 21.0 mi

Top 14%
×8stories
+106ft-24ft

Overall

4090

Males

3688

M18-39

3688

21M→35K

21.0 - 21.8 mi

Top 13%
×7stories
+17ft-86ft

Overall

3638

Males

3285

M18-39

3285

35K→23M

21.8 - 23.0 mi

Top 21%
×5stories
+23ft-63ft

Overall

5939

Males

4917

M18-39

4917

23M→24M

23.0 - 24.0 mi

Top 23%
×6stories
+12ft-82ft

Overall

6671

Males

5318

M18-39

5318

24M→40K

24.0 - 24.9 mi

Top 24%
×1story
+6ft-20ft

Overall

6796

Males

5301

M18-39

5301

40K→25.2M

24.9 - 25.2 mi

Top 30%
×1story
+13ft-16ft

Overall

8414

Males

6099

M18-39

6099

25.2M→Finish

25.2 - 26.2 mi

Top 21%
×2stories
+22ft-21ft

Overall

5896

Males

4654

M18-39

4654

Passing Analysis

Category:
Athletes Passed
360
Passed By
1661
Net Change
-1301
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#1746
5K → 10K58139-81#1746#1827
10K → 15K25117-92#1827#1919
15K → 20K33184-151#1919#2070
20K → Half340-37#2070#2107
Half → 25K17179-162#2107#2269
25K → 30K47234-187#2269#2456
30K → 20M3366-33#2456#2489
20M → 21M2899-71#2489#2560
21M → 35K2353-30#2560#2590
35K → 23M27177-150#2590#2740
23M → 24M17116-99#2740#2839
24M → 40K20111-91#2839#2930
40K → 25.2M464-60#2930#2990
25.2M → Finish2582-57#2990#3047
TOTALS3601661-1301
📊

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