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BOSTON MARATHON 2023

Emma Alonso

Bib: 17123•F

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Gender (Female)
#0 / 11423
Top 41%
Masters (Masters Women)
#0 / 6539
Top 28%
Division (F40-44)
#0 / 1878
Top 49%
Race Day Weather
49°/39°F
light intensity drizzle

⏱️ Race Timeline

Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent
Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
5K· 3.11 mi
8:09/mi
25:20
↑ 97↓ 3451.5%
10K· 6.21 mi
7:58/mi
50:05
↑ 79↓ 1380.4%
15K· 9.32 mi
7:54/mi
1:14:38
↑ 67↓ 78
20K· 12.43 mi
7:58/mi
1:39:24
↑ 106↓ 860.1%
Half· 13.11 mi
7:55/mi
1:44:48
↑ 19↓ 370.5%
25K· 15.53 mi
8:01/mi
2:04:14
↑ 66↓ 880.2%
30K· 18.64 mi
8:14/mi
2:29:48
↑ 181↓ 1480.2%
20M
8:20/mi
2:41:07
↑ 64↓ 500.2%
21M
9:35/mi
2:50:42
↑ 106↓ 241.6%
35K· 21.75 mi
8:25/mi
2:57:00
↑ 17↓ 861.7%
23M
9:26/mi
3:08:49
↑ 23↓ 630.6%
24M
9:17/mi
3:18:06
↓ 821.3%
40K· 24.85 mi
9:18/mi
3:26:03
↓ 200.3%
25.2M
10:47/mi
3:29:46
↑ 13↓ 160.2%
Finish· 26.22 mi
8:42/mi
3:38:38
↑ 22↓ 21

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:44:48
Pace8:00 /mi
2nd Half
Distance13.11 mi
Time1:53:50
Pace8:41 /mi
📊Positive Split: 8.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:15:5525:208:0925:20
8:09
-
10K
6.21 mi11:40:4050:058:0424:45
7:58
-0:11
15K
9.32 mi12:05:131:14:388:0024:33
7:54
-0:04
20K
12.43 mi12:29:591:39:248:0024:46
7:58
+0:04
Half
13.11 mi12:35:231:44:488:005:24
7:55
-0:03
25K
15.53 mi12:54:492:04:148:0019:26
8:01
+0:06
30K
18.64 mi13:20:232:29:488:0225:34
8:14
+0:13
20M
20.00 mi13:31:422:41:078:0311:19
8:20
+0:06
21M
21.00 mi13:41:172:50:428:089:35
9:35
+1:15
35K
21.75 mi13:47:352:57:008:086:18
8:25
-1:10
23M
23.00 mi13:59:243:08:498:1311:49
9:26
+1:01
24M
24.00 mi14:08:413:18:068:159:17
9:17
-0:09
40K
24.85 mi14:16:383:26:038:177:57
9:18
+0:01
25.2M
25.20 mi14:20:213:29:468:193:43
10:47
+1:29
Finish
26.22 mi14:29:133:38:388:218:52
8:42
-2:05

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

7:54 /mi

Average Pace

8:21 /mi

Slowest Pace

10:47 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

29:57

14% of race

Time at Steady Pace

2:26:20

67% of race

Time at Slower Pace

42:21

19% of race

Average Pace: 8:20 /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 mi11:15:5525:208:0925:20
8:09
#15119
10K
6.21 mi11:40:4050:058:0424:45
7:58
#14831
15K
9.32 mi12:05:131:14:388:0024:33
7:54
#14420
20K
12.43 mi12:29:591:39:248:0024:46
7:58
#14100
Half
13.11 mi12:35:231:44:488:005:24
7:55
#14076
25K
15.53 mi12:54:492:04:148:0019:26
8:01
#13853
30K
18.64 mi13:20:232:29:488:0225:34
8:14
#13567
20M
20.00 mi13:31:422:41:078:0311:19
8:20
#13474
21M
21.00 mi13:41:172:50:428:089:35
9:35
#13686
35K
21.75 mi13:47:352:57:008:086:18
8:25
#13710
23M
23.00 mi13:59:243:08:498:1311:49
9:26
#14026
24M
24.00 mi14:08:413:18:068:159:17
9:17
#14285
40K
24.85 mi14:16:383:26:038:177:57
9:18
#14414
25.2M
25.20 mi14:20:213:29:468:193:43
10:47
#14526
Finish
26.22 mi14:29:133:38:388:218:52
8:42
#14598
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF40-44Seg. OverallSeg. FemalesSeg. F40-44
5K3.11 mi3.11 mi151194723472313582(Top 51%)3829(Top 34%)3829(Top 204%)
10K6.21 mi3.10 mi14831+2884545+1784545+17814556(Top 55%)4392(Top 38%)4392(Top 234%)
15K9.32 mi3.11 mi14420+4114310+2354310+23513582(Top 51%)3829(Top 34%)3829(Top 204%)
20K12.43 mi3.11 mi14100+3204147+1634147+16313221(Top 50%)3670(Top 32%)3670(Top 195%)
Half13.11 mi0.68 mi14076+244129+184129+1813782(Top 52%)3969(Top 35%)3969(Top 211%)
25K15.53 mi2.42 mi13853+2234025+1044025+10412892(Top 48%)3575(Top 31%)3575(Top 190%)
30K18.64 mi3.11 mi13567+2863882+1433882+14312550(Top 47%)3496(Top 31%)3496(Top 186%)
20M20.00 mi1.36 mi13474+933844+383844+3812576(Top 47%)3633(Top 32%)3633(Top 193%)
21M21.00 mi1.00 mi13686-2123981-1373981-13716356(Top 61%)5822(Top 51%)5822(Top 310%)
35K21.75 mi0.75 mi13710-244014-334014-3314866(Top 56%)5021(Top 44%)5021(Top 267%)
23M23.00 mi1.25 mi14026-3164243-2294243-22918071(Top 68%)6898(Top 60%)6898(Top 367%)
24M24.00 mi1.00 mi14285-2594424-1814424-18118397(Top 69%)7104(Top 62%)7104(Top 378%)
40K24.85 mi0.85 mi14414-1294526-1024526-10217521(Top 66%)6686(Top 59%)6686(Top 356%)
25.2M25.20 mi0.35 mi14526-1124602-764602-7619912(Top 75%)8001(Top 70%)8001(Top 426%)
Finish26.22 mi1.02 mi14598-724659-574659-5716504(Top 62%)6095(Top 53%)6095(Top 325%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 51%
×21story building
+97ft-345ft

Overall

13582

Females

3829

F40-44

3829

5K→10K

3.1 - 6.2 mi

Top 55%
×5story building
+79ft-138ft

Overall

14556

Females

4392

F40-44

4392

10K→15K

6.2 - 9.3 mi

Top 51%
×3story building
+67ft-78ft

Overall

13582

Females

3829

F40-44

3829

15K→20K

9.3 - 12.4 mi

Top 50%
×5story building
+106ft-86ft

Overall

13221

Females

3670

F40-44

3670

20K→Half

12.4 - 13.1 mi

Top 52%
×2story building
+19ft-37ft

Overall

13782

Females

3969

F40-44

3969

Half→25K

13.1 - 15.5 mi

Top 48%
×4story building
+66ft-88ft

Overall

12892

Females

3575

F40-44

3575

25K→30K

15.5 - 18.6 mi

Top 47%
×9story building
+181ft-148ft

Overall

12550

Females

3496

F40-44

3496

30K→20M

18.6 - 20.0 mi

Top 47%
×5story building
+64ft-50ft

Overall

12576

Females

3633

F40-44

3633

20M→21M

20.0 - 21.0 mi

Top 61%
×8story building
+106ft-24ft

Overall

16356

Females

5822

F40-44

5822

21M→35K

21.0 - 21.8 mi

Top 56%
×7story building
+17ft-86ft

Overall

14866

Females

5021

F40-44

5021

35K→23M

21.8 - 23.0 mi

Top 68%
×5story building
+23ft-63ft

Overall

18071

Females

6898

F40-44

6898

23M→24M

23.0 - 24.0 mi

Top 69%
×6story building
+12ft-82ft

Overall

18397

Females

7104

F40-44

7104

24M→40K

24.0 - 24.9 mi

Top 66%
×1story
+6ft-20ft

Overall

17521

Females

6686

F40-44

6686

40K→25.2M

24.9 - 25.2 mi

Top 75%
×1story
+13ft-16ft

Overall

19912

Females

8001

F40-44

8001

25.2M→Finish

25.2 - 26.2 mi

Top 62%
×2story building
+22ft-21ft

Overall

16504

Females

6095

F40-44

6095

Passing Analysis

Category:
Athletes Passed
2270
Passed By
1749
Net Change
+521
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#15119
5K → 10K460172+288#15119#14831
10K → 15K45140+411#14831#14420
15K → 20K37555+320#14420#14100
20K → Half4521+24#14100#14076
Half → 25K25835+223#14076#13853
25K → 30K33953+286#13853#13567
30K → 20M13845+93#13567#13474
20M → 21M44256-212#13474#13686
21M → 35K4266-24#13686#13710
35K → 23M25341-316#13710#14026
23M → 24M23282-259#14026#14285
24M → 40K24153-129#14285#14414
40K → 25.2M6118-112#14414#14526
25.2M → Finish40112-72#14526#14598
TOTALS22701749+521
📊

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