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BOSTON MARATHON 2025

Glennis Chan

Bib: 21471•F

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Gender (Female)
#0 / 12228
Top 43%
Masters (Masters Women)
#0 / 6759
Top 30%
Division (F45-49)
#0 / 1813
Top 36%
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
25:31
Rank: #18182
Start → 5K
25:31 | 8:13/mi
10K· 6.21 mi
50:47
Rank: #17782 (+400)
5K → 10K
25:16 | 8:08/mi
15K· 9.32 mi
1:16:08
Rank: #17545 (+237)
10K → 15K
25:21 | 8:10/mi
20K· 12.43 mi
1:41:50
Rank: #17305 (+240)
15K → 20K
25:42 | 8:16/mi
Half· 13.11 mi
1:47:22
Rank: #17262 (+43)
20K → Half
5:32 | 8:07/mi
25K· 15.53 mi
2:07:38
Rank: #17051 (+211)
Half → 25K
20:16 | 8:22/mi
30K· 18.64 mi
2:34:22
Rank: #16718 (+333)
25K → 30K
26:44 | 8:36/mi
20M
2:46:07
Rank: #16549 (+169)
30K → 20M
11:45 | 8:39/mi
21M
2:55:10
Rank: #16336 (+213)
20M → 21M
9:03 | 9:03/mi
35K· 21.75 mi
3:01:17
Rank: #16205 (+131)
21M → 35K
6:07 | 8:11/mi
23M
3:12:08
Rank: #16026 (+179)
35K → 23M
10:51 | 8:40/mi
24M
3:20:38
Rank: #15963 (+63)
23M → 24M
8:30 | 8:30/mi
40K· 24.85 mi
3:27:53
Rank: #15838 (+125)
24M → 40K
7:15 | 8:29/mi
25.2M
3:31:02
Rank: #15774 (+64)
40K → 25.2M
3:09 | 9:08/mi
Finish· 26.22 mi
3:39:22
Rank: #15714 (+60)
25.2M → Finish
8:20 | 8:11/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:47:22
Pace8:11 /mi
2nd Half
Distance13.11 mi
Time1:52:00
Pace8:33 /mi
📊Positive Split: 4.3% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:20:4125:318:1325:31
8:13
-
10K
6.21 mi11:45:5750:478:1025:16
8:08
-0:05
15K
9.32 mi12:11:181:16:088:1025:21
8:10
+0:02
20K
12.43 mi12:37:001:41:508:1225:42
8:16
+0:06
Half
13.11 mi12:42:321:47:228:115:32
8:07
-0:09
25K
15.53 mi13:02:482:07:388:1320:16
8:22
+0:15
30K
18.64 mi13:29:322:34:228:1726:44
8:36
+0:14
20M
20.00 mi13:41:172:46:078:1811:45
8:39
+0:03
21M
21.00 mi13:50:202:55:108:209:03
9:03
+0:24
35K
21.75 mi13:56:273:01:178:206:07
8:11
-0:52
23M
23.00 mi14:07:183:12:088:2110:51
8:40
+0:29
24M
24.00 mi14:15:483:20:388:228:30
8:30
-0:10
40K
24.85 mi14:23:033:27:538:227:15
8:29
-0:01
25.2M
25.20 mi14:26:123:31:028:223:09
9:08
+0:39
Finish
26.22 mi14:34:323:39:228:228:20
8:11
-0:57

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

8:07 /mi

Average Pace

8:22 /mi

Slowest Pace

9:08 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

3:27:10

94% of race

Time at Steady Pace

12:12

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:22 /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 mi11:20:4125:318:1325:31
8:13
#18182
10K
6.21 mi11:45:5750:478:1025:16
8:08
#17782
15K
9.32 mi12:11:181:16:088:1025:21
8:10
#17545
20K
12.43 mi12:37:001:41:508:1225:42
8:16
#17305
Half
13.11 mi12:42:321:47:228:115:32
8:07
#17262
25K
15.53 mi13:02:482:07:388:1320:16
8:22
#17051
30K
18.64 mi13:29:322:34:228:1726:44
8:36
#16718
20M
20.00 mi13:41:172:46:078:1811:45
8:39
#16549
21M
21.00 mi13:50:202:55:108:209:03
9:03
#16336
35K
21.75 mi13:56:273:01:178:206:07
8:11
#16205
23M
23.00 mi14:07:183:12:088:2110:51
8:40
#16026
24M
24.00 mi14:15:483:20:388:228:30
8:30
#15963
40K
24.85 mi14:23:033:27:538:227:15
8:29
#15838
25.2M
25.20 mi14:26:123:31:028:223:09
9:08
#15774
Finish
26.22 mi14:34:323:39:228:228:20
8:11
#15714
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF45-49Seg. OverallSeg. FemalesSeg. F45-49
5K3.11 mi3.11 mi181826453645317123(Top 60%)5808(Top 47%)5808(Top 320%)
10K6.21 mi3.10 mi17782+4006197+2566197+25617417(Top 61%)5952(Top 49%)5952(Top 328%)
15K9.32 mi3.11 mi17545+2376039+1586039+15817123(Top 60%)5808(Top 47%)5808(Top 320%)
20K12.43 mi3.11 mi17305+2405921+1185921+11816762(Top 59%)5646(Top 46%)5646(Top 311%)
Half13.11 mi0.68 mi17262+435904+175904+1716609(Top 58%)5553(Top 45%)5553(Top 306%)
25K15.53 mi2.42 mi17051+2115798+1065798+10616273(Top 57%)5471(Top 45%)5471(Top 302%)
30K18.64 mi3.11 mi16718+3335649+1495649+14915408(Top 54%)5132(Top 42%)5132(Top 283%)
20M20.00 mi1.36 mi16549+1695587+625587+6214678(Top 52%)4877(Top 40%)4877(Top 269%)
21M21.00 mi1.00 mi16336+2135489+985489+9813759(Top 48%)4511(Top 37%)4511(Top 249%)
35K21.75 mi0.75 mi16205+1315435+545435+5413389(Top 47%)4388(Top 36%)4388(Top 242%)
23M23.00 mi1.25 mi16026+1795376+595376+5914305(Top 50%)4976(Top 41%)4976(Top 274%)
24M24.00 mi1.00 mi15963+635360+165360+1614452(Top 51%)5078(Top 42%)5078(Top 280%)
40K24.85 mi0.85 mi15838+1255311+495311+4913249(Top 47%)4590(Top 38%)4590(Top 253%)
25.2M25.20 mi0.35 mi15774+645290+215290+2112440(Top 44%)4236(Top 35%)4236(Top 234%)
Finish26.22 mi1.02 mi15714+605279+115279+1114076(Top 50%)5004(Top 41%)5004(Top 276%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 60%
×21stories
+97ft-345ft

Overall

17123

Females

5808

F45-49

5808

5K→10K

3.1 - 6.2 mi

Top 61%
×5stories
+79ft-138ft

Overall

17417

Females

5952

F45-49

5952

10K→15K

6.2 - 9.3 mi

Top 60%
×3stories
+67ft-78ft

Overall

17123

Females

5808

F45-49

5808

15K→20K

9.3 - 12.4 mi

Top 59%
×5stories
+106ft-86ft

Overall

16762

Females

5646

F45-49

5646

20K→Half

12.4 - 13.1 mi

Top 58%
×2stories
+19ft-37ft

Overall

16609

Females

5553

F45-49

5553

Half→25K

13.1 - 15.5 mi

Top 57%
×4stories
+66ft-88ft

Overall

16273

Females

5471

F45-49

5471

25K→30K

15.5 - 18.6 mi

Top 54%
×9stories
+181ft-148ft

Overall

15408

Females

5132

F45-49

5132

30K→20M

18.6 - 20.0 mi

Top 52%
×5stories
+64ft-50ft

Overall

14678

Females

4877

F45-49

4877

20M→21M

20.0 - 21.0 mi

Top 48%
×8stories
+106ft-24ft

Overall

13759

Females

4511

F45-49

4511

21M→35K

21.0 - 21.8 mi

Top 47%
×7stories
+17ft-86ft

Overall

13389

Females

4388

F45-49

4388

35K→23M

21.8 - 23.0 mi

Top 50%
×5stories
+23ft-63ft

Overall

14305

Females

4976

F45-49

4976

23M→24M

23.0 - 24.0 mi

Top 51%
×6stories
+12ft-82ft

Overall

14452

Females

5078

F45-49

5078

24M→40K

24.0 - 24.9 mi

Top 47%
×1story
+6ft-20ft

Overall

13249

Females

4590

F45-49

4590

40K→25.2M

24.9 - 25.2 mi

Top 44%
×1story
+13ft-16ft

Overall

12440

Females

4236

F45-49

4236

25.2M→Finish

25.2 - 26.2 mi

Top 50%
×2stories
+22ft-21ft

Overall

14076

Females

5004

F45-49

5004

Passing Analysis

Category:
Athletes Passed
3049
Passed By
581
Net Change
+2468
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#18182
5K → 10K525125+400#18182#17782
10K → 15K32386+237#17782#17545
15K → 20K31474+240#17545#17305
20K → Half5512+43#17305#17262
Half → 25K26453+211#17262#17051
25K → 30K40572+333#17051#16718
30K → 20M19627+169#16718#16549
20M → 21M22916+213#16549#16336
21M → 35K1376+131#16336#16205
35K → 23M20324+179#16205#16026
23M → 24M9633+63#16026#15963
24M → 40K14116+125#15963#15838
40K → 25.2M706+64#15838#15774
25.2M → Finish9131+60#15774#15714
TOTALS3049581+2468
📊

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