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BOSTON MARATHON 2025

Alyssa Shields

Bib: 17448•F

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Overall
#0 / 28404
Top 39%
Gender (Female)
#0 / 12228
Top 23%
Division (F18-39)
#0 / 5469
Top 39%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
22:43
Rank: #10500
Start → 5K
22:43 | 7:19/mi
10K· 6.21 mi
46:11
Rank: #11556 (-1056)
5K → 10K
23:28 | 7:33/mi
15K· 9.32 mi
1:09:43
Rank: #11823 (-267)
10K → 15K
23:32 | 7:34/mi
20K· 12.43 mi
1:33:26
Rank: #11796 (+27)
15K → 20K
23:43 | 7:38/mi
Half· 13.11 mi
1:38:34
Rank: #11800 (-4)
20K → Half
5:08 | 7:31/mi
25K· 15.53 mi
1:57:20
Rank: #11797 (+3)
Half → 25K
18:46 | 7:44/mi
30K· 18.64 mi
2:22:08
Rank: #11641 (+156)
25K → 30K
24:48 | 7:59/mi
20M
2:33:03
Rank: #11495 (+146)
30K → 20M
10:55 | 8:02/mi
21M
2:41:31
Rank: #11382 (+113)
20M → 21M
8:28 | 8:28/mi
35K· 21.75 mi
2:47:21
Rank: #11354 (+28)
21M → 35K
5:50 | 7:48/mi
23M
2:57:24
Rank: #11258 (+96)
35K → 23M
10:03 | 8:02/mi
24M
3:05:11
Rank: #11135 (+123)
23M → 24M
7:47 | 7:47/mi
40K· 24.85 mi
3:12:12
Rank: #11126 (+9)
24M → 40K
7:01 | 8:12/mi
25.2M
3:15:20
Rank: #11130 (-4)
40K → 25.2M
3:08 | 9:05/mi
Finish· 26.22 mi
3:23:17
Rank: #11117 (+13)
25.2M → Finish
7:57 | 7:48/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:38:34
Pace7:31 /mi
2nd Half
Distance13.11 mi
Time1:44:43
Pace7:59 /mi
📊Positive Split: 6.2% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:12:5422:437:1922:43
7:19
-
10K
6.21 mi11:36:2246:117:2623:28
7:33
+0:14
15K
9.32 mi11:59:541:09:437:2923:32
7:34
+0:01
20K
12.43 mi12:23:371:33:267:3123:43
7:38
+0:04
Half
13.11 mi12:28:451:38:347:315:08
7:31
-0:07
25K
15.53 mi12:47:311:57:207:3318:46
7:44
+0:13
30K
18.64 mi13:12:192:22:087:3724:48
7:59
+0:15
20M
20.00 mi13:23:142:33:037:3910:55
8:02
+0:03
21M
21.00 mi13:31:422:41:317:418:28
8:28
+0:26
35K
21.75 mi13:37:322:47:217:425:50
7:48
-0:40
23M
23.00 mi13:47:352:57:247:4310:03
8:02
+0:14
24M
24.00 mi13:55:223:05:117:437:47
7:47
-0:15
40K
24.85 mi14:02:233:12:127:447:01
8:12
+0:25
25.2M
25.20 mi14:05:313:15:207:453:08
9:05
+0:53
Finish
26.22 mi14:13:283:23:177:467:57
7:48
-1:17

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

7:19 /mi

Average Pace

7:46 /mi

Slowest Pace

9:05 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:14:51

37% of race

Time at Steady Pace

1:28:51

44% of race

Time at Slower Pace

39:35

19% of race

Average Pace: 7:45 /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 mi11:12:5422:437:1922:43
7:19
#10500
10K
6.21 mi11:36:2246:117:2623:28
7:33
#11556
15K
9.32 mi11:59:541:09:437:2923:32
7:34
#11823
20K
12.43 mi12:23:371:33:267:3123:43
7:38
#11796
Half
13.11 mi12:28:451:38:347:315:08
7:31
#11800
25K
15.53 mi12:47:311:57:207:3318:46
7:44
#11797
30K
18.64 mi13:12:192:22:087:3724:48
7:59
#11641
20M
20.00 mi13:23:142:33:037:3910:55
8:02
#11495
21M
21.00 mi13:31:422:41:317:418:28
8:28
#11382
35K
21.75 mi13:37:322:47:217:425:50
7:48
#11354
23M
23.00 mi13:47:352:57:247:4310:03
8:02
#11258
24M
24.00 mi13:55:223:05:117:437:47
7:47
#11135
40K
24.85 mi14:02:233:12:127:447:01
8:12
#11126
25.2M
25.20 mi14:05:313:15:207:453:08
9:05
#11130
Finish
26.22 mi14:13:283:23:177:467:57
7:48
#11117
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi105002037203712386(Top 44%)3105(Top 25%)3105(Top 57%)
10K6.21 mi3.10 mi11556-10562583-5462583-54612604(Top 44%)3146(Top 26%)3146(Top 58%)
15K9.32 mi3.11 mi11823-2672727-1442727-14412386(Top 44%)3105(Top 25%)3105(Top 57%)
20K12.43 mi3.11 mi11796+272761-342761-3411835(Top 42%)2908(Top 24%)2908(Top 53%)
Half13.11 mi0.68 mi11800-42774-132774-1311968(Top 42%)2918(Top 24%)2918(Top 53%)
25K15.53 mi2.42 mi11797+32817-432817-4311876(Top 42%)3051(Top 25%)3051(Top 56%)
30K18.64 mi3.11 mi11641+1562804+132804+1311254(Top 40%)2909(Top 24%)2909(Top 53%)
20M20.00 mi1.36 mi11495+1462770+342770+3410683(Top 38%)2776(Top 23%)2776(Top 51%)
21M21.00 mi1.00 mi11382+1132754+162754+1610274(Top 36%)2749(Top 22%)2749(Top 50%)
35K21.75 mi0.75 mi11354+282760-62760-610837(Top 38%)3020(Top 25%)3020(Top 55%)
23M23.00 mi1.25 mi11258+962754+62754+610242(Top 36%)2860(Top 23%)2860(Top 52%)
24M24.00 mi1.00 mi11135+1232730+242730+249718(Top 34%)2672(Top 22%)2672(Top 49%)
40K24.85 mi0.85 mi11126+92755-252755-2511608(Top 41%)3700(Top 30%)3700(Top 68%)
25.2M25.20 mi0.35 mi11130-42777-222777-2212305(Top 43%)4104(Top 34%)4104(Top 75%)
Finish26.22 mi1.02 mi11117+132807-302807-3011471(Top 40%)3688(Top 30%)3688(Top 67%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 44%
×21stories
+97ft-345ft

Overall

12386

Females

3105

F18-39

3105

5K→10K

3.1 - 6.2 mi

Top 44%
×5stories
+79ft-138ft

Overall

12604

Females

3146

F18-39

3146

10K→15K

6.2 - 9.3 mi

Top 44%
×3stories
+67ft-78ft

Overall

12386

Females

3105

F18-39

3105

15K→20K

9.3 - 12.4 mi

Top 42%
×5stories
+106ft-86ft

Overall

11835

Females

2908

F18-39

2908

20K→Half

12.4 - 13.1 mi

Top 42%
×2stories
+19ft-37ft

Overall

11968

Females

2918

F18-39

2918

Half→25K

13.1 - 15.5 mi

Top 42%
×4stories
+66ft-88ft

Overall

11876

Females

3051

F18-39

3051

25K→30K

15.5 - 18.6 mi

Top 40%
×9stories
+181ft-148ft

Overall

11254

Females

2909

F18-39

2909

30K→20M

18.6 - 20.0 mi

Top 38%
×5stories
+64ft-50ft

Overall

10683

Females

2776

F18-39

2776

20M→21M

20.0 - 21.0 mi

Top 36%
×8stories
+106ft-24ft

Overall

10274

Females

2749

F18-39

2749

21M→35K

21.0 - 21.8 mi

Top 38%
×7stories
+17ft-86ft

Overall

10837

Females

3020

F18-39

3020

35K→23M

21.8 - 23.0 mi

Top 36%
×5stories
+23ft-63ft

Overall

10242

Females

2860

F18-39

2860

23M→24M

23.0 - 24.0 mi

Top 34%
×6stories
+12ft-82ft

Overall

9718

Females

2672

F18-39

2672

24M→40K

24.0 - 24.9 mi

Top 41%
×1story
+6ft-20ft

Overall

11608

Females

3700

F18-39

3700

40K→25.2M

24.9 - 25.2 mi

Top 43%
×1story
+13ft-16ft

Overall

12305

Females

4104

F18-39

4104

25.2M→Finish

25.2 - 26.2 mi

Top 40%
×2stories
+22ft-21ft

Overall

11471

Females

3688

F18-39

3688

Passing Analysis

Category:
Athletes Passed
1730
Passed By
2347
Net Change
-617
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#10500
5K → 10K331089-1056#10500#11556
10K → 15K99366-267#11556#11823
15K → 20K210183+27#11823#11796
20K → Half3236-4#11796#11800
Half → 25K158155+3#11800#11797
25K → 30K291135+156#11797#11641
30K → 20M18741+146#11641#11495
20M → 21M15441+113#11495#11382
21M → 35K7547+28#11382#11354
35K → 23M15559+96#11354#11258
23M → 24M14623+123#11258#11135
24M → 40K7970+9#11135#11126
40K → 25.2M3337-4#11126#11130
25.2M → Finish7865+13#11130#11117
TOTALS17302347-617
📊

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