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BOSTON MARATHON 2025

Lanse Natsch

Bib: 24143•M

NY

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M65-69)
#0 / 639
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
8:15/mi
25:39
↑ 97↓ 3451.5%
10K· 6.21 mi
8:58/mi
53:31
↑ 79↓ 1380.4%
15K· 9.32 mi
9:14/mi
1:22:11
↑ 67↓ 78
20K· 12.43 mi
9:44/mi
1:52:24
↑ 106↓ 860.1%
Half· 13.11 mi
9:57/mi
1:59:11
↑ 19↓ 370.5%
25K· 15.53 mi
10:21/mi
2:24:17
↑ 66↓ 880.2%
30K· 18.64 mi
11:31/mi
3:00:04
↑ 181↓ 1480.2%
20M
11:35/mi
3:15:49
↑ 64↓ 500.2%
21M
13:01/mi
3:28:50
↑ 106↓ 241.6%
35K· 21.75 mi
11:15/mi
3:37:15
↑ 17↓ 861.7%
23M
12:01/mi
3:52:18
↑ 23↓ 630.6%
24M
12:34/mi
4:04:52
↓ 821.3%
40K· 24.85 mi
12:50/mi
4:15:50
↓ 200.3%
25.2M
15:48/mi
4:21:17
↑ 13↓ 160.2%
Finish· 26.22 mi
13:41/mi
4:35:14
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:59:11
Pace9:05 /mi
2nd Half
Distance13.11 mi
Time2:36:03
Pace11:54 /mi
📊Positive Split: 30.9% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:23:4525:398:1525:39
8:15
-
10K
6.21 mi11:51:3753:318:3727:52
8:58
+0:43
15K
9.32 mi12:20:171:22:118:4928:40
9:14
+0:16
20K
12.43 mi12:50:301:52:249:0330:13
9:44
+0:30
Half
13.11 mi12:57:171:59:119:056:47
9:57
+0:13
25K
15.53 mi13:22:232:24:179:1725:06
10:21
+0:24
30K
18.64 mi13:58:103:00:049:4035:47
11:31
+1:10
20M
20.00 mi14:13:553:15:499:4715:45
11:35
+0:04
21M
21.00 mi14:26:563:28:509:5713:01
13:01
+1:26
35K
21.75 mi14:35:213:37:159:598:25
11:15
-1:46
23M
23.00 mi14:50:243:52:1810:0615:03
12:01
+0:46
24M
24.00 mi15:02:584:04:5210:1212:34
12:34
+0:33
40K
24.85 mi15:13:564:15:5010:1810:58
12:50
+0:16
25.2M
25.20 mi15:19:234:21:1710:225:27
15:48
+2:58
Finish
26.22 mi15:33:204:35:1410:3013:57
13:41
-2:07

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

8:15 /mi

Average Pace

10:30 /mi

Slowest Pace

15:48 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

2:24:17

52% of race

Time at Steady Pace

1:15:00

27% of race

Time at Slower Pace

55:57

20% of race

Average Pace: 10:30 /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 mi11:23:4525:398:1525:39
8:15
#18454
10K
6.21 mi11:51:3753:318:3727:52
8:58
#20459
15K
9.32 mi12:20:171:22:118:4928:40
9:14
#21355
20K
12.43 mi12:50:301:52:249:0330:13
9:44
#22130
Half
13.11 mi12:57:171:59:119:056:47
9:57
#22309
25K
15.53 mi13:22:232:24:179:1725:06
10:21
#22745
30K
18.64 mi13:58:103:00:049:4035:47
11:31
#23272
20M
20.00 mi14:13:553:15:499:4715:45
11:35
#23404
21M
21.00 mi14:26:563:28:509:5713:01
13:01
#23574
35K
21.75 mi14:35:213:37:159:598:25
11:15
#23627
23M
23.00 mi14:50:243:52:1810:0615:03
12:01
#23749
24M
24.00 mi15:02:584:04:5210:1212:34
12:34
#23922
40K
24.85 mi15:13:564:15:5010:1810:58
12:50
#24067
25.2M
25.20 mi15:19:234:21:1710:225:27
15:48
#24179
Finish
26.22 mi15:33:204:35:1410:3013:57
13:41
#24477
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM65-69Seg. OverallSeg. MalesSeg. M65-69
5K3.11 mi3.11 mi18454117931179322947(Top 81%)13812(Top 86%)13812(Top 2162%)
10K6.21 mi3.10 mi20459-200512651-85812651-85822252(Top 78%)13453(Top 84%)13453(Top 2105%)
15K9.32 mi3.11 mi21355-89613075-42413075-42422947(Top 81%)13812(Top 86%)13812(Top 2162%)
20K12.43 mi3.11 mi22130-77513402-32713402-32723562(Top 83%)14045(Top 87%)14045(Top 2198%)
Half13.11 mi0.68 mi22309-17913478-7613478-7624706(Top 87%)14529(Top 90%)14529(Top 2274%)
25K15.53 mi2.42 mi22745-43613684-20613684-20624075(Top 85%)14230(Top 88%)14230(Top 2227%)
30K18.64 mi3.11 mi23272-52713878-19413878-19424866(Top 88%)14470(Top 90%)14470(Top 2264%)
20M20.00 mi1.36 mi23404-13213925-4713925-4724696(Top 87%)14317(Top 89%)14317(Top 2241%)
21M21.00 mi1.00 mi23574-17013975-5013975-5025062(Top 88%)14399(Top 89%)14399(Top 2253%)
35K21.75 mi0.75 mi23627-5313990-1513990-1524692(Top 87%)14209(Top 88%)14209(Top 2224%)
23M23.00 mi1.25 mi23749-12214024-3414024-3425148(Top 89%)14407(Top 89%)14407(Top 2255%)
24M24.00 mi1.00 mi23922-17314095-7114095-7126390(Top 93%)15006(Top 93%)15006(Top 2348%)
40K24.85 mi0.85 mi24067-14514139-4414139-4426111(Top 92%)14853(Top 92%)14853(Top 2324%)
25.2M25.20 mi0.35 mi24179-11214192-5314192-5327614(Top 97%)15604(Top 97%)15604(Top 2442%)
Finish26.22 mi1.02 mi24477-29814323-13114323-13127938(Top 98%)15806(Top 98%)15806(Top 2474%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 81%
×21story building
+97ft-345ft

Overall

22947

Males

13812

M65-69

13812

5K→10K

3.1 - 6.2 mi

Top 78%
×5story building
+79ft-138ft

Overall

22252

Males

13453

M65-69

13453

10K→15K

6.2 - 9.3 mi

Top 81%
×3story building
+67ft-78ft

Overall

22947

Males

13812

M65-69

13812

15K→20K

9.3 - 12.4 mi

Top 83%
×5story building
+106ft-86ft

Overall

23562

Males

14045

M65-69

14045

20K→Half

12.4 - 13.1 mi

Top 87%
×2story building
+19ft-37ft

Overall

24706

Males

14529

M65-69

14529

Half→25K

13.1 - 15.5 mi

Top 85%
×4story building
+66ft-88ft

Overall

24075

Males

14230

M65-69

14230

25K→30K

15.5 - 18.6 mi

Top 88%
×9story building
+181ft-148ft

Overall

24866

Males

14470

M65-69

14470

30K→20M

18.6 - 20.0 mi

Top 87%
×5story building
+64ft-50ft

Overall

24696

Males

14317

M65-69

14317

20M→21M

20.0 - 21.0 mi

Top 88%
×8story building
+106ft-24ft

Overall

25062

Males

14399

M65-69

14399

21M→35K

21.0 - 21.8 mi

Top 87%
×7story building
+17ft-86ft

Overall

24692

Males

14209

M65-69

14209

35K→23M

21.8 - 23.0 mi

Top 89%
×5story building
+23ft-63ft

Overall

25148

Males

14407

M65-69

14407

23M→24M

23.0 - 24.0 mi

Top 93%
×6story building
+12ft-82ft

Overall

26390

Males

15006

M65-69

15006

24M→40K

24.0 - 24.9 mi

Top 92%
×1story
+6ft-20ft

Overall

26111

Males

14853

M65-69

14853

40K→25.2M

24.9 - 25.2 mi

Top 97%
×1story
+13ft-16ft

Overall

27614

Males

15604

M65-69

15604

25.2M→Finish

25.2 - 26.2 mi

Top 98%
×2story building
+22ft-21ft

Overall

27938

Males

15806

M65-69

15806

Passing Analysis

Category:
Athletes Passed
378
Passed By
6401
Net Change
-6023
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18454
5K → 10K132018-2005#18454#20459
10K → 15K48944-896#20459#21355
15K → 20K48823-775#21355#22130
20K → Half6185-179#22130#22309
Half → 25K50486-436#22309#22745
25K → 30K48575-527#22745#23272
30K → 20M41173-132#23272#23404
20M → 21M27197-170#23404#23574
21M → 35K3588-53#23574#23627
35K → 23M39161-122#23627#23749
23M → 24M9182-173#23749#23922
24M → 40K9154-145#23922#24067
40K → 25.2M2114-112#24067#24179
25.2M → Finish3301-298#24179#24477
TOTALS3786401-6023
📊

Passing Visuals

Category:
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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