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BOSTON MARATHON 2025

Winnie Lai

ON

Bib: 18819 F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 48%
Gender (Female)
#0 / 12228
Top 33%
Masters (Masters Women)
#0 / 6759
Top 18%
Division (F45-49)
#0 / 1813
Top 21%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
8:04/mi
25:04
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
8:05/mi
50:11
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
8:07/mi
1:15:23
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
8:05/mi
1:40:30
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:59/mi
1:45:57
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
8:04/mi
2:05:30
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
8:11/mi
2:30:56
↑ 181↓ 1480.2%
138 ft elev
20M
8:09/mi
2:42:01
↑ 64↓ 500.2%
148 ft elev
21M
8:11/mi
2:50:12
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
7:56/mi
2:56:08
↑ 17↓ 861.7%
156 ft elev
23M
7:54/mi
3:06:02
↑ 23↓ 630.6%
116 ft elev
24M
7:46/mi
3:13:48
↓ 821.3%
34 ft elev
40K· 24.85 mi
7:44/mi
3:20:25
↓ 200.3%
20 ft elev
25.2M
8:33/mi
3:23:22
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
7:40/mi
3:31:11
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

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A one-of-a-kind AI Race Performance Report that reads your race like a coach. A plain-English story of how you raced, where you surged and faded, and what it all means. Emailed to you, free.

Half Splits

1st Half· via Half⚖️ Balanced
Distance13.11 mi
Time1:45:57
Pace8:05 /mi
2nd Half⚖️ Balanced
Distance13.11 mi
Time1:45:14
Pace8:02 /mi
📊Even Split: Consistent pacing between halves

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:15:3025:048:0425:04
8:04
-
10K
6.21 mi11:40:3750:118:0525:07
8:05
+0:01
15K
9.32 mi12:05:491:15:238:0525:12
8:07
+0:02
20K
12.43 mi12:30:561:40:308:0525:07
8:05
-0:02
Half
13.11 mi12:36:231:45:578:055:27
7:59
-0:06
25K
15.53 mi12:55:562:05:308:0519:33
8:04
+0:05
30K
18.64 mi13:21:222:30:568:0625:26
8:11
+0:07
20M
20.00 mi13:32:272:42:018:0611:05
8:09
-0:02
21M
21.00 mi13:40:382:50:128:068:11
8:11
+0:02
35K
21.75 mi13:46:342:56:088:065:56
7:56
-0:15
23M
23.00 mi13:56:283:06:028:059:54
7:54
-0:02
24M
24.00 mi14:04:143:13:488:057:46
7:46
-0:08
40K
24.85 mi14:10:513:20:258:046:37
7:44
-0:02
25.2M
25.20 mi14:13:483:23:228:042:57
8:33
+0:49
Finish
26.22 mi14:21:373:31:118:047:49
7:40
-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

7:40 /mi

Average Pace

8:04 /mi

Slowest Pace

8:33 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:28:14

99% of race

Time at Steady Pace

2:57

1% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:03 /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 mi11:15:3025:048:0425:04
8:04
#17139
10K
6.21 mi11:40:3750:118:0525:07
8:05
#17082
15K
9.32 mi12:05:491:15:238:0525:12
8:07
#16985
20K
12.43 mi12:30:561:40:308:0525:07
8:05
#16578
Half
13.11 mi12:36:231:45:578:055:27
7:59
#16547
25K
15.53 mi12:55:562:05:308:0519:33
8:04
#16164
30K
18.64 mi13:21:222:30:568:0625:26
8:11
#15485
20M
20.00 mi13:32:272:42:018:0611:05
8:09
#15143
21M
21.00 mi13:40:382:50:128:068:11
8:11
#14702
35K
21.75 mi13:46:342:56:088:065:56
7:56
#14560
23M
23.00 mi13:56:283:06:028:059:54
7:54
#14245
24M
24.00 mi14:04:143:13:488:057:46
7:46
#14025
40K
24.85 mi14:10:513:20:258:046:37
7:44
#13745
25.2M
25.20 mi14:13:483:23:228:042:57
8:33
#13656
Finish
26.22 mi14:21:373:31:118:047:49
7:40
#13532
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi171395816581616806(Top 59%)5609(Top 46%)5609(Top 309%)
10K6.21 mi3.10 mi17082+575771+455771+4517086(Top 60%)5751(Top 47%)5751(Top 317%)
15K9.32 mi3.11 mi16985+975702+695702+6916806(Top 59%)5609(Top 46%)5609(Top 309%)
20K12.43 mi3.11 mi16578+4075484+2185484+21815533(Top 55%)4925(Top 40%)4925(Top 272%)
Half13.11 mi0.68 mi16547+315464+205464+2015806(Top 56%)5041(Top 41%)5041(Top 278%)
25K15.53 mi2.42 mi16164+3835254+2105254+21014370(Top 51%)4405(Top 36%)4405(Top 243%)
30K18.64 mi3.11 mi15485+6794939+3154939+31512740(Top 45%)3688(Top 30%)3688(Top 203%)
20M20.00 mi1.36 mi15143+3424785+1544785+15411543(Top 41%)3212(Top 26%)3212(Top 177%)
21M21.00 mi1.00 mi14702+4414557+2284557+2288533(Top 30%)1968(Top 16%)1968(Top 109%)
35K21.75 mi0.75 mi14560+1424486+714486+7111823(Top 42%)3562(Top 29%)3562(Top 196%)
23M23.00 mi1.25 mi14245+3154357+1294357+1299393(Top 33%)2460(Top 20%)2460(Top 136%)
24M24.00 mi1.00 mi14025+2204278+794278+799627(Top 34%)2633(Top 22%)2633(Top 145%)
40K24.85 mi0.85 mi13745+2804148+1304148+1308412(Top 30%)2195(Top 18%)2195(Top 121%)
25.2M25.20 mi0.35 mi13656+894105+434105+439239(Top 33%)2676(Top 22%)2676(Top 148%)
Finish26.22 mi1.02 mi13532+1244058+474058+4710522(Top 37%)3237(Top 26%)3237(Top 179%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 59%
×21story building
+97ft-345ft

Overall

16806

Females

5609

F45-49

5609

5K→10K

3.1 - 6.2 mi

Top 60%
×5story building
+79ft-138ft

Overall

17086

Females

5751

F45-49

5751

10K→15K

6.2 - 9.3 mi

Top 59%
×3story building
+67ft-78ft

Overall

16806

Females

5609

F45-49

5609

15K→20K

9.3 - 12.4 mi

Top 55%
×5story building
+106ft-86ft

Overall

15533

Females

4925

F45-49

4925

20K→Half

12.4 - 13.1 mi

Top 56%
×2story building
+19ft-37ft

Overall

15806

Females

5041

F45-49

5041

Half→25K

13.1 - 15.5 mi

Top 51%
×4story building
+66ft-88ft

Overall

14370

Females

4405

F45-49

4405

25K→30K

15.5 - 18.6 mi

Top 45%
×9story building
+181ft-148ft

Overall

12740

Females

3688

F45-49

3688

30K→20M

18.6 - 20.0 mi

Top 41%
×5story building
+64ft-50ft

Overall

11543

Females

3212

F45-49

3212

20M→21M

20.0 - 21.0 mi

Top 30%
×8story building
+106ft-24ft

Overall

8533

Females

1968

F45-49

1968

21M→35K

21.0 - 21.8 mi

Top 42%
×7story building
+17ft-86ft

Overall

11823

Females

3562

F45-49

3562

35K→23M

21.8 - 23.0 mi

Top 33%
×5story building
+23ft-63ft

Overall

9393

Females

2460

F45-49

2460

23M→24M

23.0 - 24.0 mi

Top 34%
×6story building
+12ft-82ft

Overall

9627

Females

2633

F45-49

2633

24M→40K

24.0 - 24.9 mi

Top 30%
×1story
+6ft-20ft

Overall

8412

Females

2195

F45-49

2195

40K→25.2M

24.9 - 25.2 mi

Top 33%
×1story
+13ft-16ft

Overall

9239

Females

2676

F45-49

2676

25.2M→Finish

25.2 - 26.2 mi

Top 37%
×2story building
+22ft-21ft

Overall

10522

Females

3237

F45-49

3237

Passing Analysis

Category:
Athletes Passed
4153
Passed By
546
Net Change
+3607
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17139
5K → 10K317260+57#17139#17082
10K → 15K248151+97#17082#16985
15K → 20K44639+407#16985#16578
20K → Half4918+31#16578#16547
Half → 25K39815+383#16547#16164
25K → 30K6856+679#16164#15485
30K → 20M3486+342#15485#15143
20M → 21M4410+441#15143#14702
21M → 35K15715+142#14702#14560
35K → 23M3183+315#14560#14245
23M → 24M2266+220#14245#14025
24M → 40K2822+280#14025#13745
40K → 25.2M923+89#13745#13656
25.2M → Finish14622+124#13656#13532
TOTALS4153546+3607
📊

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