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BOSTON MARATHON 2023

Jacalyn Johnson-Alviza

Bib: 16747•F

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0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Top 50%
Masters (Masters Women)
#0 / 6539
Top 39%
Division (F40-44)
#0 / 1878
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
25:19
Rank: #15082
Start → 5K
25:19 | 8:09/mi
10K· 6.21 mi
51:20
Rank: #16249 (-1167)
5K → 10K
26:01 | 8:22/mi
15K· 9.32 mi
1:17:55
Rank: #16920 (-671)
10K → 15K
26:35 | 8:33/mi
20K· 12.43 mi
1:44:38
Rank: #17066 (-146)
15K → 20K
26:43 | 8:36/mi
Half· 13.11 mi
1:50:19
Rank: #17050 (+16)
20K → Half
5:41 | 8:20/mi
25K· 15.53 mi
2:11:20
Rank: #17064 (-14)
Half → 25K
21:01 | 8:40/mi
30K· 18.64 mi
2:39:09
Rank: #16988 (+76)
25K → 30K
27:49 | 8:57/mi
20M
2:51:42
Rank: #17038 (-50)
30K → 20M
12:33 | 9:14/mi
21M
3:00:55
Rank: #16893 (+145)
20M → 21M
9:13 | 9:13/mi
35K· 21.75 mi
3:07:11
Rank: #16795 (+98)
21M → 35K
6:16 | 8:23/mi
23M
3:18:17
Rank: #16708 (+87)
35K → 23M
11:06 | 8:52/mi
24M
3:26:57
Rank: #16643 (+65)
23M → 24M
8:40 | 8:40/mi
40K· 24.85 mi
3:34:24
Rank: #16558 (+85)
24M → 40K
7:27 | 8:43/mi
25.2M
3:37:36
Rank: #16505 (+53)
40K → 25.2M
3:12 | 9:17/mi
Finish· 26.22 mi
3:45:34
Rank: #16291 (+214)
25.2M → Finish
7:58 | 7:49/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:50:19
Pace8:25 /mi
2nd Half
Distance13.11 mi
Time1:55:15
Pace8:47 /mi
📊Positive Split: 4.5% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:15:2625:198:0925:19
8:09
-
10K
6.21 mi11:41:2751:208:1626:01
8:22
+0:13
15K
9.32 mi12:08:021:17:558:2226:35
8:33
+0:11
20K
12.43 mi12:34:451:44:388:2526:43
8:36
+0:03
Half
13.11 mi12:40:261:50:198:255:41
8:20
-0:16
25K
15.53 mi13:01:272:11:208:2721:01
8:40
+0:20
30K
18.64 mi13:29:162:39:098:3227:49
8:57
+0:17
20M
20.00 mi13:41:492:51:428:3512:33
9:14
+0:17
21M
21.00 mi13:51:023:00:558:379:13
9:13
-0:01
35K
21.75 mi13:57:183:07:118:366:16
8:23
-0:50
23M
23.00 mi14:08:243:18:178:3711:06
8:52
+0:29
24M
24.00 mi14:17:043:26:578:378:40
8:40
-0:12
40K
24.85 mi14:24:313:34:248:387:27
8:43
+0:03
25.2M
25.20 mi14:27:433:37:368:383:12
9:17
+0:34
Finish
26.22 mi14:35:413:45:348:377:58
7:49
-1:28

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

7:49 /mi

Average Pace

8:37 /mi

Slowest Pace

9:17 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:37:50

43% of race

Time at Steady Pace

1:51:59

50% of race

Time at Slower Pace

15:45

7% of race

Average Pace: 8:36 /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 mi11:15:2625:198:0925:19
8:09
#15082
10K
6.21 mi11:41:2751:208:1626:01
8:22
#16249
15K
9.32 mi12:08:021:17:558:2226:35
8:33
#16920
20K
12.43 mi12:34:451:44:388:2526:43
8:36
#17066
Half
13.11 mi12:40:261:50:198:255:41
8:20
#17050
25K
15.53 mi13:01:272:11:208:2721:01
8:40
#17064
30K
18.64 mi13:29:162:39:098:3227:49
8:57
#16988
20M
20.00 mi13:41:492:51:428:3512:33
9:14
#17038
21M
21.00 mi13:51:023:00:558:379:13
9:13
#16893
35K
21.75 mi13:57:183:07:118:366:16
8:23
#16795
23M
23.00 mi14:08:243:18:178:3711:06
8:52
#16708
24M
24.00 mi14:17:043:26:578:378:40
8:40
#16643
40K
24.85 mi14:24:313:34:248:387:27
8:43
#16558
25.2M
25.20 mi14:27:433:37:368:383:12
9:17
#16505
Finish
26.22 mi14:35:413:45:348:377:58
7:49
#16291
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi150824701470118186(Top 68%)6609(Top 58%)6609(Top 352%)
10K6.21 mi3.10 mi16249-11675425-7245425-72417412(Top 65%)6132(Top 54%)6132(Top 327%)
15K9.32 mi3.11 mi16920-6715865-4405865-44018186(Top 68%)6609(Top 58%)6609(Top 352%)
20K12.43 mi3.11 mi17066-1465971-1065971-10617486(Top 66%)6212(Top 54%)6212(Top 331%)
Half13.11 mi0.68 mi17050+165960+115960+1116712(Top 63%)5723(Top 50%)5723(Top 305%)
25K15.53 mi2.42 mi17064-145984-245984-2417211(Top 65%)6120(Top 54%)6120(Top 326%)
30K18.64 mi3.11 mi16988+765956+285956+2816931(Top 64%)6022(Top 53%)6022(Top 321%)
20M20.00 mi1.36 mi17038-505990-345990-3417719(Top 67%)6583(Top 58%)6583(Top 351%)
21M21.00 mi1.00 mi16893+1455922+685922+6814595(Top 55%)4825(Top 42%)4825(Top 257%)
35K21.75 mi0.75 mi16795+985874+485874+4814631(Top 55%)4913(Top 43%)4913(Top 262%)
23M23.00 mi1.25 mi16708+875851+235851+2315378(Top 58%)5387(Top 47%)5387(Top 287%)
24M24.00 mi1.00 mi16643+655828+235828+2315490(Top 58%)5530(Top 48%)5530(Top 294%)
40K24.85 mi0.85 mi16558+855801+275801+2714636(Top 55%)5110(Top 45%)5110(Top 272%)
25.2M25.20 mi0.35 mi16505+535775+265775+2614172(Top 53%)4856(Top 43%)4856(Top 259%)
Finish26.22 mi1.02 mi16291+2145657+1185657+11810870(Top 41%)3144(Top 28%)3144(Top 167%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 68%
×21stories
+97ft-345ft

Overall

18186

Females

6609

F40-44

6609

5K→10K

3.1 - 6.2 mi

Top 65%
×5stories
+79ft-138ft

Overall

17412

Females

6132

F40-44

6132

10K→15K

6.2 - 9.3 mi

Top 68%
×3stories
+67ft-78ft

Overall

18186

Females

6609

F40-44

6609

15K→20K

9.3 - 12.4 mi

Top 66%
×5stories
+106ft-86ft

Overall

17486

Females

6212

F40-44

6212

20K→Half

12.4 - 13.1 mi

Top 63%
×2stories
+19ft-37ft

Overall

16712

Females

5723

F40-44

5723

Half→25K

13.1 - 15.5 mi

Top 65%
×4stories
+66ft-88ft

Overall

17211

Females

6120

F40-44

6120

25K→30K

15.5 - 18.6 mi

Top 64%
×9stories
+181ft-148ft

Overall

16931

Females

6022

F40-44

6022

30K→20M

18.6 - 20.0 mi

Top 67%
×5stories
+64ft-50ft

Overall

17719

Females

6583

F40-44

6583

20M→21M

20.0 - 21.0 mi

Top 55%
×8stories
+106ft-24ft

Overall

14595

Females

4825

F40-44

4825

21M→35K

21.0 - 21.8 mi

Top 55%
×7stories
+17ft-86ft

Overall

14631

Females

4913

F40-44

4913

35K→23M

21.8 - 23.0 mi

Top 58%
×5stories
+23ft-63ft

Overall

15378

Females

5387

F40-44

5387

23M→24M

23.0 - 24.0 mi

Top 58%
×6stories
+12ft-82ft

Overall

15490

Females

5530

F40-44

5530

24M→40K

24.0 - 24.9 mi

Top 55%
×1story
+6ft-20ft

Overall

14636

Females

5110

F40-44

5110

40K→25.2M

24.9 - 25.2 mi

Top 53%
×1story
+13ft-16ft

Overall

14172

Females

4856

F40-44

4856

25.2M→Finish

25.2 - 26.2 mi

Top 41%
×2stories
+22ft-21ft

Overall

10870

Females

3144

F40-44

3144

Passing Analysis

Category:
Athletes Passed
1500
Passed By
2709
Net Change
-1209
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#15082
5K → 10K321199-1167#15082#16249
10K → 15K43714-671#16249#16920
15K → 20K129275-146#16920#17066
20K → Half3620+16#17066#17050
Half → 25K115129-14#17050#17064
25K → 30K210134+76#17064#16988
30K → 20M59109-50#16988#17038
20M → 21M16621+145#17038#16893
21M → 35K1046+98#16893#16795
35K → 23M13144+87#16795#16708
23M → 24M9631+65#16708#16643
24M → 40K10217+85#16643#16558
40K → 25.2M618+53#16558#16505
25.2M → Finish2162+214#16505#16291
TOTALS15002709-1209
📊

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