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BOSTON MARATHON 2025

Karl Bylund

Bib: 24470•M

WA

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M70-74)
#0 / 228
Top 15%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
26:25
Rank: #19891
Start → 5K
26:25 | 8:30/mi
10K· 6.21 mi
53:36
Rank: #20532 (-641)
5K → 10K
27:11 | 8:45/mi
15K· 9.32 mi
1:21:02
Rank: #20722 (-190)
10K → 15K
27:26 | 8:50/mi
20K· 12.43 mi
1:49:04
Rank: #20803 (-81)
15K → 20K
28:02 | 9:01/mi
Half· 13.11 mi
1:54:52
Rank: #20729 (+74)
20K → Half
5:48 | 8:30/mi
25K· 15.53 mi
2:16:10
Rank: #20437 (+292)
Half → 25K
21:18 | 8:47/mi
30K· 18.64 mi
2:44:17
Rank: #19935 (+502)
25K → 30K
28:07 | 9:03/mi
20M
2:56:42
Rank: #19737 (+198)
30K → 20M
12:25 | 9:08/mi
21M
3:06:32
Rank: #19612 (+125)
20M → 21M
9:50 | 9:50/mi
35K· 21.75 mi
3:13:23
Rank: #19600 (+12)
21M → 35K
6:51 | 9:09/mi
23M
3:26:26
Rank: #19791 (-191)
35K → 23M
13:03 | 10:25/mi
24M
3:36:40
Rank: #19937 (-146)
23M → 24M
10:14 | 10:14/mi
40K· 24.85 mi
3:44:42
Rank: #19869 (+68)
24M → 40K
8:02 | 9:24/mi
25.2M
3:48:04
Rank: #19818 (+51)
40K → 25.2M
3:22 | 9:46/mi
Finish· 26.22 mi
3:57:12
Rank: #19785 (+33)
25.2M → Finish
9:08 | 8:58/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:54:52
Pace8:46 /mi
2nd Half
Distance13.11 mi
Time2:02:20
Pace9:20 /mi
📊Positive Split: 6.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:25:0826:258:3026:25
8:30
-
10K
6.21 mi11:52:1953:368:3827:11
8:45
+0:15
15K
9.32 mi12:19:451:21:028:4227:26
8:50
+0:05
20K
12.43 mi12:47:471:49:048:4728:02
9:01
+0:11
Half
13.11 mi12:53:351:54:528:465:48
8:30
-0:31
25K
15.53 mi13:14:532:16:108:4621:18
8:47
+0:17
30K
18.64 mi13:43:002:44:178:4928:07
9:03
+0:16
20M
20.00 mi13:55:252:56:428:5012:25
9:08
+0:05
21M
21.00 mi14:05:153:06:328:539:50
9:50
+0:42
35K
21.75 mi14:12:063:13:238:546:51
9:09
-0:41
23M
23.00 mi14:25:093:26:268:5913:03
10:25
+1:16
24M
24.00 mi14:35:233:36:409:0210:14
10:14
-0:11
40K
24.85 mi14:43:253:44:429:028:02
9:24
-0:50
25.2M
25.20 mi14:46:473:48:049:033:22
9:46
+0:22
Finish
26.22 mi14:55:553:57:129:039:08
8:58
-0:48

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

8:30 /mi

Average Pace

9:03 /mi

Slowest Pace

10:25 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

59:24

25% of race

Time at Steady Pace

2:13:17

56% of race

Time at Slower Pace

44:31

19% of race

Average Pace: 9:03 /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 mi11:25:0826:258:3026:25
8:30
#19891
10K
6.21 mi11:52:1953:368:3827:11
8:45
#20532
15K
9.32 mi12:19:451:21:028:4227:26
8:50
#20722
20K
12.43 mi12:47:471:49:048:4728:02
9:01
#20803
Half
13.11 mi12:53:351:54:528:465:48
8:30
#20729
25K
15.53 mi13:14:532:16:108:4621:18
8:47
#20437
30K
18.64 mi13:43:002:44:178:4928:07
9:03
#19935
20M
20.00 mi13:55:252:56:428:5012:25
9:08
#19737
21M
21.00 mi14:05:153:06:328:539:50
9:50
#19612
35K
21.75 mi14:12:063:13:238:546:51
9:09
#19600
23M
23.00 mi14:25:093:26:268:5913:03
10:25
#19791
24M
24.00 mi14:35:233:36:409:0210:14
10:14
#19937
40K
24.85 mi14:43:253:44:429:028:02
9:24
#19869
25.2M
25.20 mi14:46:473:48:049:033:22
9:46
#19818
Finish
26.22 mi14:55:553:57:129:039:08
8:58
#19785
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM70-74Seg. OverallSeg. MalesSeg. M70-74
5K3.11 mi3.11 mi19891123941239421166(Top 75%)13014(Top 81%)13014(Top 5708%)
10K6.21 mi3.10 mi20532-64112684-29012684-29021145(Top 74%)12976(Top 81%)12976(Top 5691%)
15K9.32 mi3.11 mi20722-19012788-10412788-10421166(Top 75%)13014(Top 81%)13014(Top 5708%)
20K12.43 mi3.11 mi20803-8112818-3012818-3021086(Top 74%)12921(Top 80%)12921(Top 5667%)
Half13.11 mi0.68 mi20729+7412785+3312785+3319180(Top 68%)12128(Top 75%)12128(Top 5319%)
25K15.53 mi2.42 mi20437+29212646+13912646+13918843(Top 66%)11898(Top 74%)11898(Top 5218%)
30K18.64 mi3.11 mi19935+50212390+25612390+25617936(Top 63%)11345(Top 70%)11345(Top 4976%)
20M20.00 mi1.36 mi19737+19812290+10012290+10017479(Top 62%)11027(Top 68%)11027(Top 4836%)
21M21.00 mi1.00 mi19612+12512204+8612204+8617622(Top 62%)10978(Top 68%)10978(Top 4815%)
35K21.75 mi0.75 mi19600+1212183+2112183+2118969(Top 67%)11483(Top 71%)11483(Top 5036%)
23M23.00 mi1.25 mi19791-19112233-5012233-5021788(Top 77%)12769(Top 79%)12769(Top 5600%)
24M24.00 mi1.00 mi19937-14612270-3712270-3722019(Top 78%)12816(Top 80%)12816(Top 5621%)
40K24.85 mi0.85 mi19869+6812224+4612224+4618256(Top 64%)10962(Top 68%)10962(Top 4808%)
25.2M25.20 mi0.35 mi19818+5112196+2812196+2815905(Top 56%)9842(Top 61%)9842(Top 4317%)
Finish26.22 mi1.02 mi19785+3312167+2912167+2918837(Top 66%)11286(Top 70%)11286(Top 4950%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 75%
×21stories
+97ft-345ft

Overall

21166

Males

13014

M70-74

13014

5K→10K

3.1 - 6.2 mi

Top 74%
×5stories
+79ft-138ft

Overall

21145

Males

12976

M70-74

12976

10K→15K

6.2 - 9.3 mi

Top 75%
×3stories
+67ft-78ft

Overall

21166

Males

13014

M70-74

13014

15K→20K

9.3 - 12.4 mi

Top 74%
×5stories
+106ft-86ft

Overall

21086

Males

12921

M70-74

12921

20K→Half

12.4 - 13.1 mi

Top 68%
×2stories
+19ft-37ft

Overall

19180

Males

12128

M70-74

12128

Half→25K

13.1 - 15.5 mi

Top 66%
×4stories
+66ft-88ft

Overall

18843

Males

11898

M70-74

11898

25K→30K

15.5 - 18.6 mi

Top 63%
×9stories
+181ft-148ft

Overall

17936

Males

11345

M70-74

11345

30K→20M

18.6 - 20.0 mi

Top 62%
×5stories
+64ft-50ft

Overall

17479

Males

11027

M70-74

11027

20M→21M

20.0 - 21.0 mi

Top 62%
×8stories
+106ft-24ft

Overall

17622

Males

10978

M70-74

10978

21M→35K

21.0 - 21.8 mi

Top 67%
×7stories
+17ft-86ft

Overall

18969

Males

11483

M70-74

11483

35K→23M

21.8 - 23.0 mi

Top 77%
×5stories
+23ft-63ft

Overall

21788

Males

12769

M70-74

12769

23M→24M

23.0 - 24.0 mi

Top 78%
×6stories
+12ft-82ft

Overall

22019

Males

12816

M70-74

12816

24M→40K

24.0 - 24.9 mi

Top 64%
×1story
+6ft-20ft

Overall

18256

Males

10962

M70-74

10962

40K→25.2M

24.9 - 25.2 mi

Top 56%
×1story
+13ft-16ft

Overall

15905

Males

9842

M70-74

9842

25.2M→Finish

25.2 - 26.2 mi

Top 66%
×2stories
+22ft-21ft

Overall

18837

Males

11286

M70-74

11286

Passing Analysis

Category:
Athletes Passed
2042
Passed By
1936
Net Change
+106
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#19891
5K → 10K82723-641#19891#20532
10K → 15K132322-190#20532#20722
15K → 20K155236-81#20722#20803
20K → Half795+74#20803#20729
Half → 25K31927+292#20729#20437
25K → 30K52927+502#20437#19935
30K → 20M21618+198#19935#19737
20M → 21M17449+125#19737#19612
21M → 35K5341+12#19612#19600
35K → 23M41232-191#19600#19791
23M → 24M37183-146#19791#19937
24M → 40K9628+68#19937#19869
40K → 25.2M565+51#19869#19818
25.2M → Finish7340+33#19818#19785
TOTALS20421936+106
📊

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