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BOSTON MARATHON 2023

Jamie Keifer

Bib: 29929•F

MI

0:00
0:00
/ mi
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Division (F18-39)
#0 / 4884
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
31:46
Rank: #24011
Start → 5K
31:46 | 10:13/mi
10K· 6.21 mi
1:02:17
Rank: #23672 (+339)
5K → 10K
30:31 | 9:49/mi
15K· 9.32 mi
1:33:40
Rank: #23702 (-30)
10K → 15K
31:23 | 10:06/mi
20K· 12.43 mi
2:06:57
Rank: #23844 (-142)
15K → 20K
33:17 | 10:43/mi
Half· 13.11 mi
2:13:30
Rank: #23776 (+68)
20K → Half
6:33 | 9:36/mi
25K· 15.53 mi
2:37:24
Rank: #23474 (+302)
Half → 25K
23:54 | 9:51/mi
30K· 18.64 mi
3:08:27
Rank: #23070 (+404)
25K → 30K
31:03 | 10:00/mi
20M
3:22:13
Rank: #22888 (+182)
30K → 20M
13:46 | 10:08/mi
21M
3:32:39
Rank: #22720 (+168)
20M → 21M
10:26 | 10:26/mi
35K· 21.75 mi
3:39:52
Rank: #22637 (+83)
21M → 35K
7:13 | 9:39/mi
23M
3:52:27
Rank: #22498 (+139)
35K → 23M
12:35 | 10:03/mi
24M
4:02:07
Rank: #22401 (+97)
23M → 24M
9:40 | 9:40/mi
40K· 24.85 mi
4:10:21
Rank: #22284 (+117)
24M → 40K
8:14 | 9:38/mi
25.2M
4:13:57
Rank: #22243 (+41)
40K → 25.2M
3:36 | 10:26/mi
Finish· 26.22 mi
4:23:10
Rank: #22123 (+120)
25.2M → Finish
9:13 | 9:03/mi

The Course

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Half Splits

1st Half· via Half
Distance13.11 mi
Time2:13:30
Pace10:11 /mi
2nd Half✓ Faster
Distance13.11 mi
Time2:09:40
Pace9:53 /mi
📊Negative Split: 2.9% faster second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:49:5931:4610:1331:46
10:13
-
10K
6.21 mi12:20:301:02:1710:0130:31
9:49
-0:24
15K
9.32 mi12:51:531:33:4010:0331:23
10:06
+0:17
20K
12.43 mi13:25:102:06:5710:1333:17
10:43
+0:37
Half
13.11 mi13:31:432:13:3010:116:33
9:36
-1:07
25K
15.53 mi13:55:372:37:2410:0823:54
9:51
+0:15
30K
18.64 mi14:26:403:08:2710:0731:03
10:00
+0:09
20M
20.00 mi14:40:263:22:1310:0713:46
10:08
+0:08
21M
21.00 mi14:50:523:32:3910:0810:26
10:26
+0:18
35K
21.75 mi14:58:053:39:5210:077:13
9:39
-0:47
23M
23.00 mi15:10:403:52:2710:0612:35
10:03
+0:24
24M
24.00 mi15:20:204:02:0710:059:40
9:40
-0:23
40K
24.85 mi15:28:344:10:2110:048:14
9:38
-0:02
25.2M
25.20 mi15:32:104:13:5710:053:36
10:26
+0:48
Finish
26.22 mi15:41:234:23:1010:039:13
9:03
-1:23

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

9:03 /mi

Average Pace

10:03 /mi

Slowest Pace

10:43 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:35:18

36% of race

Time at Steady Pace

2:14:35

51% of race

Time at Slower Pace

33:17

13% of race

Average Pace: 10:02 /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 mi11:49:5931:4610:1331:46
10:13
#24011
10K
6.21 mi12:20:301:02:1710:0130:31
9:49
#23672
15K
9.32 mi12:51:531:33:4010:0331:23
10:06
#23702
20K
12.43 mi13:25:102:06:5710:1333:17
10:43
#23844
Half
13.11 mi13:31:432:13:3010:116:33
9:36
#23776
25K
15.53 mi13:55:372:37:2410:0823:54
9:51
#23474
30K
18.64 mi14:26:403:08:2710:0731:03
10:00
#23070
20M
20.00 mi14:40:263:22:1310:0713:46
10:08
#22888
21M
21.00 mi14:50:523:32:3910:0810:26
10:26
#22720
35K
21.75 mi14:58:053:39:5210:077:13
9:39
#22637
23M
23.00 mi15:10:403:52:2710:0612:35
10:03
#22498
24M
24.00 mi15:20:204:02:0710:059:40
9:40
#22401
40K
24.85 mi15:28:344:10:2110:048:14
9:38
#22284
25.2M
25.20 mi15:32:104:13:5710:053:36
10:26
#22243
Finish
26.22 mi15:41:234:23:1010:039:13
9:03
#22123
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF18-39Seg. OverallSeg. FemalesSeg. F18-39
5K3.11 mi3.11 mi240119895989523698(Top 89%)9723(Top 85%)9723(Top 199%)
10K6.21 mi3.10 mi23672+3399710+1859710+18523326(Top 88%)9527(Top 83%)9527(Top 195%)
15K9.32 mi3.11 mi23702-309725-159725-1523698(Top 89%)9723(Top 85%)9723(Top 199%)
20K12.43 mi3.11 mi23844-1429807-829807-8224193(Top 91%)10023(Top 88%)10023(Top 205%)
Half13.11 mi0.68 mi23776+689764+439764+4322402(Top 84%)9010(Top 79%)9010(Top 184%)
25K15.53 mi2.42 mi23474+3029606+1589606+15821875(Top 82%)8771(Top 77%)8771(Top 180%)
30K18.64 mi3.11 mi23070+4049422+1849422+18421023(Top 79%)8359(Top 73%)8359(Top 171%)
20M20.00 mi1.36 mi22888+1829340+829340+8220843(Top 78%)8330(Top 73%)8330(Top 171%)
21M21.00 mi1.00 mi22720+1689260+809260+8019410(Top 73%)7594(Top 66%)7594(Top 155%)
35K21.75 mi0.75 mi22637+839227+339227+3320339(Top 76%)8139(Top 71%)8139(Top 167%)
23M23.00 mi1.25 mi22498+1399154+739154+7320152(Top 76%)8049(Top 70%)8049(Top 165%)
24M24.00 mi1.00 mi22401+979106+489106+4819803(Top 74%)7874(Top 69%)7874(Top 161%)
40K24.85 mi0.85 mi22284+1179046+609046+6018828(Top 71%)7401(Top 65%)7401(Top 152%)
25.2M25.20 mi0.35 mi22243+419025+219025+2118975(Top 71%)7516(Top 66%)7516(Top 154%)
Finish26.22 mi1.02 mi22123+1208973+528973+5218234(Top 68%)7041(Top 62%)7041(Top 144%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 89%
×21stories
+97ft-345ft

Overall

23698

Females

9723

F18-39

9723

5K→10K

3.1 - 6.2 mi

Top 88%
×5stories
+79ft-138ft

Overall

23326

Females

9527

F18-39

9527

10K→15K

6.2 - 9.3 mi

Top 89%
×3stories
+67ft-78ft

Overall

23698

Females

9723

F18-39

9723

15K→20K

9.3 - 12.4 mi

Top 91%
×5stories
+106ft-86ft

Overall

24193

Females

10023

F18-39

10023

20K→Half

12.4 - 13.1 mi

Top 84%
×2stories
+19ft-37ft

Overall

22402

Females

9010

F18-39

9010

Half→25K

13.1 - 15.5 mi

Top 82%
×4stories
+66ft-88ft

Overall

21875

Females

8771

F18-39

8771

25K→30K

15.5 - 18.6 mi

Top 79%
×9stories
+181ft-148ft

Overall

21023

Females

8359

F18-39

8359

30K→20M

18.6 - 20.0 mi

Top 78%
×5stories
+64ft-50ft

Overall

20843

Females

8330

F18-39

8330

20M→21M

20.0 - 21.0 mi

Top 73%
×8stories
+106ft-24ft

Overall

19410

Females

7594

F18-39

7594

21M→35K

21.0 - 21.8 mi

Top 76%
×7stories
+17ft-86ft

Overall

20339

Females

8139

F18-39

8139

35K→23M

21.8 - 23.0 mi

Top 76%
×5stories
+23ft-63ft

Overall

20152

Females

8049

F18-39

8049

23M→24M

23.0 - 24.0 mi

Top 74%
×6stories
+12ft-82ft

Overall

19803

Females

7874

F18-39

7874

24M→40K

24.0 - 24.9 mi

Top 71%
×1story
+6ft-20ft

Overall

18828

Females

7401

F18-39

7401

40K→25.2M

24.9 - 25.2 mi

Top 71%
×1story
+13ft-16ft

Overall

18975

Females

7516

F18-39

7516

25.2M→Finish

25.2 - 26.2 mi

Top 68%
×2stories
+22ft-21ft

Overall

18234

Females

7041

F18-39

7041

Passing Analysis

Category:
Athletes Passed
2360
Passed By
472
Net Change
+1888
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#24011
5K → 10K42788+339#24011#23672
10K → 15K109139-30#23672#23702
15K → 20K71213-142#23702#23844
20K → Half680+68#23844#23776
Half → 25K3064+302#23776#23474
25K → 30K4062+404#23474#23070
30K → 20M1886+182#23070#22888
20M → 21M1713+168#22888#22720
21M → 35K852+83#22720#22637
35K → 23M1456+139#22637#22498
23M → 24M1003+97#22498#22401
24M → 40K1192+117#22401#22284
40K → 25.2M410+41#22284#22243
25.2M → Finish1244+120#22243#22123
TOTALS2360472+1888
📊

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