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BOSTON MARATHON 2025

Amanda Koslosky

Bib: 18834•F

CO

0:00
0:00
/ mi
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 38%
Division (F18-39)
#0 / 5469
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:58
Rank: #11270
Start → 5K
22:58 | 7:24/mi
10K· 6.21 mi
53:13
Rank: #20215 (-8945)
5K → 10K
30:15 | 9:44/mi
15K· 9.32 mi
1:20:20
Rank: #20302 (-87)
10K → 15K
27:07 | 8:44/mi
20K· 12.43 mi
1:46:18
Rank: #19614 (+688)
15K → 20K
25:58 | 8:21/mi
Half· 13.11 mi
1:51:46
Rank: #19431 (+183)
20K → Half
5:28 | 8:01/mi
25K· 15.53 mi
2:11:23
Rank: #18636 (+795)
Half → 25K
19:37 | 8:05/mi
30K· 18.64 mi
2:35:43
Rank: #17156 (+1480)
25K → 30K
24:20 | 7:50/mi
20M
2:46:42
Rank: #16736 (+420)
30K → 20M
10:59 | 8:05/mi
21M
2:54:53
Rank: #16240 (+496)
20M → 21M
8:11 | 8:11/mi
35K· 21.75 mi
3:00:40
Rank: #16026 (+214)
21M → 35K
5:47 | 7:44/mi
23M
3:10:23
Rank: #15574 (+452)
35K → 23M
9:43 | 7:46/mi
24M
3:18:10
Rank: #15299 (+275)
23M → 24M
7:47 | 7:47/mi
40K· 24.85 mi
3:24:45
Rank: #15018 (+281)
24M → 40K
6:35 | 7:42/mi
25.2M
3:27:33
Rank: #14850 (+168)
40K → 25.2M
2:48 | 8:07/mi
Finish· 26.22 mi
3:34:55
Rank: #14552 (+298)
25.2M → Finish
7:22 | 7:14/mi

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time1:51:46
Pace8:32 /mi
2nd Half✓ Faster
Distance13.11 mi
Time1:43:09
Pace7:52 /mi
📊Negative Split: 7.7% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:13:3622:587:2422:58
7:24
-
10K
6.21 mi11:43:5153:138:3430:15
9:44
+2:20
15K
9.32 mi12:10:581:20:208:3727:07
8:44
-1:00
20K
12.43 mi12:36:561:46:188:3325:58
8:21
-0:23
Half
13.11 mi12:42:241:51:468:325:28
8:01
-0:20
25K
15.53 mi13:02:012:11:238:2719:37
8:05
+0:04
30K
18.64 mi13:26:212:35:438:2124:20
7:50
-0:15
20M
20.00 mi13:37:202:46:428:2010:59
8:05
+0:15
21M
21.00 mi13:45:312:54:538:208:11
8:11
+0:06
35K
21.75 mi13:51:183:00:408:185:47
7:44
-0:27
23M
23.00 mi14:01:013:10:238:179:43
7:46
+0:02
24M
24.00 mi14:08:483:18:108:157:47
7:47
+0:01
40K
24.85 mi14:15:233:24:458:146:35
7:42
-0:05
25.2M
25.20 mi14:18:113:27:338:142:48
8:07
+0:25
Finish
26.22 mi14:25:333:34:558:127:22
7:14
-0:53

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

7:14 /mi

Average Pace

8:12 /mi

Slowest Pace

9:44 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

36:55

17% of race

Time at Steady Pace

1:34:40

44% of race

Time at Slower Pace

1:23:20

39% of race

Average Pace: 8:12 /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 mi11:13:3622:587:2422:58
7:24
#11270
10K
6.21 mi11:43:5153:138:3430:15
9:44
#20215
15K
9.32 mi12:10:581:20:208:3727:07
8:44
#20302
20K
12.43 mi12:36:561:46:188:3325:58
8:21
#19614
Half
13.11 mi12:42:241:51:468:325:28
8:01
#19431
25K
15.53 mi13:02:012:11:238:2719:37
8:05
#18636
30K
18.64 mi13:26:212:35:438:2124:20
7:50
#17156
20M
20.00 mi13:37:202:46:428:2010:59
8:05
#16736
21M
21.00 mi13:45:312:54:538:208:11
8:11
#16240
35K
21.75 mi13:51:183:00:408:185:47
7:44
#16026
23M
23.00 mi14:01:013:10:238:179:43
7:46
#15574
24M
24.00 mi14:08:483:18:108:157:47
7:47
#15299
40K
24.85 mi14:15:233:24:458:146:35
7:42
#15018
25.2M
25.20 mi14:18:113:27:338:142:48
8:07
#14850
Finish
26.22 mi14:25:333:34:558:127:22
7:14
#14552
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi112702415241520639(Top 73%)7794(Top 64%)7794(Top 143%)
10K6.21 mi3.10 mi20215-89457600-51857600-518524708(Top 87%)10072(Top 82%)10072(Top 184%)
15K9.32 mi3.11 mi20302-877644-447644-4420639(Top 73%)7794(Top 64%)7794(Top 143%)
20K12.43 mi3.11 mi19614+6887251+3937251+39317281(Top 61%)5926(Top 48%)5926(Top 108%)
Half13.11 mi0.68 mi19431+1837150+1017150+10116023(Top 56%)5184(Top 42%)5184(Top 95%)
25K15.53 mi2.42 mi18636+7956713+4376713+43714593(Top 51%)4537(Top 37%)4537(Top 83%)
30K18.64 mi3.11 mi17156+14805908+8055908+80510182(Top 36%)2374(Top 19%)2374(Top 43%)
20M20.00 mi1.36 mi16736+4205682+2265682+22611028(Top 39%)2969(Top 24%)2969(Top 54%)
21M21.00 mi1.00 mi16240+4965429+2535429+2538534(Top 30%)1969(Top 16%)1969(Top 36%)
35K21.75 mi0.75 mi16026+2145336+935336+9310387(Top 37%)2812(Top 23%)2812(Top 51%)
23M23.00 mi1.25 mi15574+4525116+2205116+2208355(Top 29%)1984(Top 16%)1984(Top 36%)
24M24.00 mi1.00 mi15299+2754980+1364980+1369745(Top 34%)2699(Top 22%)2699(Top 49%)
40K24.85 mi0.85 mi15018+2814844+1364844+1368148(Top 29%)2075(Top 17%)2075(Top 38%)
25.2M25.20 mi0.35 mi14850+1684753+914753+916722(Top 24%)1550(Top 13%)1550(Top 28%)
Finish26.22 mi1.02 mi14552+2984624+1294624+1297288(Top 26%)1787(Top 15%)1787(Top 33%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 73%
×21stories
+97ft-345ft

Overall

20639

Females

7794

F18-39

7794

5K→10K

3.1 - 6.2 mi

Top 87%
×5stories
+79ft-138ft

Overall

24708

Females

10072

F18-39

10072

10K→15K

6.2 - 9.3 mi

Top 73%
×3stories
+67ft-78ft

Overall

20639

Females

7794

F18-39

7794

15K→20K

9.3 - 12.4 mi

Top 61%
×5stories
+106ft-86ft

Overall

17281

Females

5926

F18-39

5926

20K→Half

12.4 - 13.1 mi

Top 56%
×2stories
+19ft-37ft

Overall

16023

Females

5184

F18-39

5184

Half→25K

13.1 - 15.5 mi

Top 51%
×4stories
+66ft-88ft

Overall

14593

Females

4537

F18-39

4537

25K→30K

15.5 - 18.6 mi

Top 36%
×9stories
+181ft-148ft

Overall

10182

Females

2374

F18-39

2374

30K→20M

18.6 - 20.0 mi

Top 39%
×5stories
+64ft-50ft

Overall

11028

Females

2969

F18-39

2969

20M→21M

20.0 - 21.0 mi

Top 30%
×8stories
+106ft-24ft

Overall

8534

Females

1969

F18-39

1969

21M→35K

21.0 - 21.8 mi

Top 37%
×7stories
+17ft-86ft

Overall

10387

Females

2812

F18-39

2812

35K→23M

21.8 - 23.0 mi

Top 29%
×5stories
+23ft-63ft

Overall

8355

Females

1984

F18-39

1984

23M→24M

23.0 - 24.0 mi

Top 34%
×6stories
+12ft-82ft

Overall

9745

Females

2699

F18-39

2699

24M→40K

24.0 - 24.9 mi

Top 29%
×1story
+6ft-20ft

Overall

8148

Females

2075

F18-39

2075

40K→25.2M

24.9 - 25.2 mi

Top 24%
×1story
+13ft-16ft

Overall

6722

Females

1550

F18-39

1550

25.2M→Finish

25.2 - 26.2 mi

Top 26%
×2stories
+22ft-21ft

Overall

7288

Females

1787

F18-39

1787

Passing Analysis

Category:
Athletes Passed
5915
Passed By
9197
Net Change
-3282
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#11270
5K → 10K18946-8945#11270#20215
10K → 15K158245-87#20215#20302
15K → 20K6924+688#20302#19614
20K → Half1841+183#19614#19431
Half → 25K7950+795#19431#18636
25K → 30K14800+1480#18636#17156
30K → 20M4200+420#17156#16736
20M → 21M4960+496#16736#16240
21M → 35K2140+214#16240#16026
35K → 23M4520+452#16026#15574
23M → 24M2750+275#15574#15299
24M → 40K2821+281#15299#15018
40K → 25.2M1680+168#15018#14850
25.2M → Finish2980+298#14850#14552
TOTALS59159197-3282
📊

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