Boston Marathon logo
BOSTON MARATHON 2025

Chong Altenburg

Bib: 23576•F

CA

0:00
0:00
/ mi
Masters
Be the first to cheer!
Overall
#0 / 28404
Gender (Female)
#0 / 12228
Masters (Masters Women)
#0 / 6759
Division (F65-69)
#0 / 222
Top 17%
Race Day Weather
50°/40°F
broken clouds

⏱️ 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
8:44/mi
27:09
↑ 97↓ 3451.5%
10K· 6.21 mi
8:46/mi
54:24
↑ 79↓ 1380.4%
15K· 9.32 mi
8:56/mi
1:22:10
↑ 67↓ 78
20K· 12.43 mi
9:07/mi
1:50:29
↑ 106↓ 860.1%
Half· 13.11 mi
9:05/mi
1:56:41
↑ 19↓ 370.5%
25K· 15.53 mi
9:18/mi
2:19:14
↑ 66↓ 880.2%
30K· 18.64 mi
9:40/mi
2:49:17
↑ 181↓ 1480.2%
20M
9:55/mi
3:02:45
↑ 64↓ 500.2%
21M
10:47/mi
3:13:32
↑ 106↓ 241.6%
35K· 21.75 mi
9:16/mi
3:20:28
↑ 17↓ 861.7%
23M
9:47/mi
3:32:43
↑ 23↓ 630.6%
24M
9:27/mi
3:42:10
↓ 821.3%
40K· 24.85 mi
9:23/mi
3:50:11
↓ 200.3%
25.2M
10:26/mi
3:53:47
↑ 13↓ 160.2%
Finish· 26.22 mi
9:12/mi
4:03:10
↑ 22↓ 21

The Course

Is this your race?

Claim it — unlock a deeper AI report on this race, free

A personalized Race Performance Report that goes beyond this page — emailed to you, built from your real splits.

Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:56:41
Pace8:54 /mi
2nd Half
Distance13.11 mi
Time2:06:29
Pace9:39 /mi
📊Positive Split: 8.4% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:25:2227:098:4427:09
8:44
-
10K
6.21 mi11:52:3754:248:4527:15
8:46
+0:02
15K
9.32 mi12:20:231:22:108:4927:46
8:56
+0:10
20K
12.43 mi12:48:421:50:298:5328:19
9:07
+0:11
Half
13.11 mi12:54:541:56:418:546:12
9:05
-0:02
25K
15.53 mi13:17:272:19:148:5822:33
9:18
+0:13
30K
18.64 mi13:47:302:49:179:0530:03
9:40
+0:22
20M
20.00 mi14:00:583:02:459:0813:28
9:55
+0:15
21M
21.00 mi14:11:453:13:329:1310:47
10:47
+0:52
35K
21.75 mi14:18:413:20:289:136:56
9:16
-1:31
23M
23.00 mi14:30:563:32:439:1512:15
9:47
+0:31
24M
24.00 mi14:40:233:42:109:159:27
9:27
-0:20
40K
24.85 mi14:48:243:50:119:168:01
9:23
-0:04
25.2M
25.20 mi14:52:003:53:479:173:36
10:26
+1:03
Finish
26.22 mi15:01:234:03:109:179:23
9:12
-1:14

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

8:44 /mi

Average Pace

9:17 /mi

Slowest Pace

10:47 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:22:10

34% of race

Time at Steady Pace

1:30:51

37% of race

Time at Slower Pace

1:10:09

29% of race

Average Pace: 9:16 /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 mi11:25:2227:098:4427:09
8:44
#21204
10K
6.21 mi11:52:3754:248:4527:15
8:46
#21200
15K
9.32 mi12:20:231:22:108:4927:46
8:56
#21350
20K
12.43 mi12:48:421:50:298:5328:19
9:07
#21396
Half
13.11 mi12:54:541:56:418:546:12
9:05
#21437
25K
15.53 mi13:17:272:19:148:5822:33
9:18
#21394
30K
18.64 mi13:47:302:49:179:0530:03
9:40
#21255
20M
20.00 mi14:00:583:02:459:0813:28
9:55
#21193
21M
21.00 mi14:11:453:13:329:1310:47
10:47
#21202
35K
21.75 mi14:18:413:20:289:136:56
9:16
#21113
23M
23.00 mi14:30:563:32:439:1512:15
9:47
#21025
24M
24.00 mi14:40:233:42:109:159:27
9:27
#20963
40K
24.85 mi14:48:243:50:119:168:01
9:23
#20862
25.2M
25.20 mi14:52:003:53:479:173:36
10:26
#20820
Finish
26.22 mi15:01:234:03:109:179:23
9:12
#20791
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF65-69Seg. OverallSeg. FemalesSeg. F65-69
5K3.11 mi3.11 mi212048199819921746(Top 77%)8404(Top 69%)8404(Top 3786%)
10K6.21 mi3.10 mi21200+48163+368163+3621265(Top 75%)8180(Top 67%)8180(Top 3685%)
15K9.32 mi3.11 mi21350-1508218-558218-5521746(Top 77%)8404(Top 69%)8404(Top 3786%)
20K12.43 mi3.11 mi21396-468259-418259-4121518(Top 76%)8325(Top 68%)8325(Top 3750%)
Half13.11 mi0.68 mi21437-418279-208279-2022186(Top 78%)8703(Top 71%)8703(Top 3920%)
25K15.53 mi2.42 mi21394+438269+108269+1021184(Top 75%)8199(Top 67%)8199(Top 3693%)
30K18.64 mi3.11 mi21255+1398221+488221+4820615(Top 73%)7999(Top 65%)7999(Top 3603%)
20M20.00 mi1.36 mi21193+628214+78214+720649(Top 73%)8168(Top 67%)8168(Top 3679%)
21M21.00 mi1.00 mi21202-98233-198233-1920799(Top 73%)8344(Top 68%)8344(Top 3759%)
35K21.75 mi0.75 mi21113+898197+368197+3619482(Top 69%)7714(Top 63%)7714(Top 3475%)
23M23.00 mi1.25 mi21025+888174+238174+2319761(Top 70%)7926(Top 65%)7926(Top 3570%)
24M24.00 mi1.00 mi20963+628158+168158+1619453(Top 68%)7803(Top 64%)7803(Top 3515%)
40K24.85 mi0.85 mi20862+1018123+358123+3518212(Top 64%)7236(Top 59%)7236(Top 3259%)
25.2M25.20 mi0.35 mi20820+428114+98114+918854(Top 66%)7565(Top 62%)7565(Top 3408%)
Finish26.22 mi1.02 mi20791+298112+28112+220003(Top 70%)8151(Top 67%)8151(Top 3672%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 77%
×21story building
+97ft-345ft

Overall

21746

Females

8404

F65-69

8404

5K→10K

3.1 - 6.2 mi

Top 75%
×5story building
+79ft-138ft

Overall

21265

Females

8180

F65-69

8180

10K→15K

6.2 - 9.3 mi

Top 77%
×3story building
+67ft-78ft

Overall

21746

Females

8404

F65-69

8404

15K→20K

9.3 - 12.4 mi

Top 76%
×5story building
+106ft-86ft

Overall

21518

Females

8325

F65-69

8325

20K→Half

12.4 - 13.1 mi

Top 78%
×2story building
+19ft-37ft

Overall

22186

Females

8703

F65-69

8703

Half→25K

13.1 - 15.5 mi

Top 75%
×4story building
+66ft-88ft

Overall

21184

Females

8199

F65-69

8199

25K→30K

15.5 - 18.6 mi

Top 73%
×9story building
+181ft-148ft

Overall

20615

Females

7999

F65-69

7999

30K→20M

18.6 - 20.0 mi

Top 73%
×5story building
+64ft-50ft

Overall

20649

Females

8168

F65-69

8168

20M→21M

20.0 - 21.0 mi

Top 73%
×8story building
+106ft-24ft

Overall

20799

Females

8344

F65-69

8344

21M→35K

21.0 - 21.8 mi

Top 69%
×7story building
+17ft-86ft

Overall

19482

Females

7714

F65-69

7714

35K→23M

21.8 - 23.0 mi

Top 70%
×5story building
+23ft-63ft

Overall

19761

Females

7926

F65-69

7926

23M→24M

23.0 - 24.0 mi

Top 68%
×6story building
+12ft-82ft

Overall

19453

Females

7803

F65-69

7803

24M→40K

24.0 - 24.9 mi

Top 64%
×1story
+6ft-20ft

Overall

18212

Females

7236

F65-69

7236

40K→25.2M

24.9 - 25.2 mi

Top 66%
×1story
+13ft-16ft

Overall

18854

Females

7565

F65-69

7565

25.2M→Finish

25.2 - 26.2 mi

Top 70%
×2story building
+22ft-21ft

Overall

20003

Females

8151

F65-69

8151

Passing Analysis

Category:
Athletes Passed
1814
Passed By
1401
Net Change
+413
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#21204
5K → 10K281277+4#21204#21200
10K → 15K158308-150#21200#21350
15K → 20K180226-46#21350#21396
20K → Half2061-41#21396#21437
Half → 25K167124+43#21437#21394
25K → 30K261122+139#21394#21255
30K → 20M12664+62#21255#21193
20M → 21M8594-9#21193#21202
21M → 35K10415+89#21202#21113
35K → 23M12840+88#21113#21025
23M → 24M9028+62#21025#20963
24M → 40K11312+101#20963#20862
40K → 25.2M5311+42#20862#20820
25.2M → Finish4819+29#20820#20791
TOTALS18141401+413
📊

Passing Visuals

Category:
Loading...

🔄Passing Circle

Loading...

🌊Position Flow

Loading...

🏃Race Lanes

Loading...

Upload your GPX file

Supports Garmin, Apple Watch, Polar, Suunto, COROS, Strava, and other apps

.gpx files up to 10MB

Export Track Data

Download your race performance as a GPX or TCX file to import into Strava, Garmin Connect, or other fitness apps.

Questions or issues regarding timing data?

If you notice any discrepancies in your timing data or have questions about your results, our support team can help.

Contact Race Support

Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing