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BOSTON MARATHON 2026

Rebecca Chassie

Bib: 21699•F

SC

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0:00
0:00
/ mi
Masters
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Overall
#0 / 29021
Gender (Female)
#0 / 12578
Masters (Masters Women)
#0 / 6862
Top 39%
Age Group (F50-54)
#0 / 1233
Top 34%
Race Day Weather
51°/41°F
overcast clouds

Race Timeline and Course Information

Your journey through the course with elevation, pacing, and checkpoint details

⏱️ Race Timeline

Watch your race unfold from start to finish

Start
0:00:00
Race begins
5K
25:10
3.11 mi
Rank: #17622
Start → 5K
25:10 | 8:07/mi
10K
50:39
6.21 mi
Rank: #18113 (-491)
5K → 10K
25:29 | 8:13/mi
15K
1:16:24
9.32 mi
Rank: #18358 (-245)
10K → 15K
25:45 | 8:18/mi
20K
1:42:20
12.43 mi
Rank: #18368 (-10)
15K → 20K
25:56 | 8:21/mi
HALF
1:47:53
13.11 mi
Rank: #18346 (+22)
20K → HALF
5:33 | 8:09/mi
25K
2:07:57
15.53 mi
Rank: #18164 (+182)
HALF → 25K
20:04 | 8:17/mi
30K
2:34:44
18.64 mi
Rank: #18032 (+132)
25K → 30K
26:47 | 8:38/mi
20M
2:46:38
20.00 mi
Rank: #17971 (+61)
30K → 20M
11:54 | 8:46/mi
21M
2:55:39
21.00 mi
Rank: #17873 (+98)
20M → 21M
9:01 | 9:01/mi
35K
3:01:52
21.75 mi
Rank: #17805 (+68)
21M → 35K
6:13 | 8:19/mi
23M
3:12:27
23.00 mi
Rank: #17649 (+156)
35K → 23M
10:35 | 8:28/mi
24M
3:20:53
24.00 mi
Rank: #17566 (+83)
23M → 24M
8:26 | 8:26/mi
40K
3:28:13
24.85 mi
Rank: #17485 (+81)
24M → 40K
7:20 | 8:35/mi
25.2M
3:31:23
25.20 mi
Rank: #17451 (+34)
40K → 25.2M
3:10 | 9:11/mi
FINISH
3:39:45
26.22 mi
Rank: #17417 (+34)
25.2M → FINISH
8:22 | 8:13/mi

Splits & Pacing

Detailed breakdown of your race performance at each timing point

Half Splits

1st HalfFaster
via HALF
Distance13.11 mi
Time1:47:53
Pace8:14 /mi
2nd Half
Distance13.11 mi
Time1:51:52
Pace8:32 /mi
📊Positive Split: 3.7% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:27:1225:108:0725:10
8:07
-
10K
6.21 mi11:52:4150:398:1025:29
8:13
+0:06
15K
9.32 mi12:18:261:16:248:1225:45
8:18
+0:05
20K
12.43 mi12:44:221:42:208:1525:56
8:21
+0:03
HALF
13.11 mi12:49:551:47:538:145:33
8:09
-0:12
25K
15.53 mi13:09:592:07:578:1520:04
8:17
+0:08
30K
18.64 mi13:36:462:34:448:1926:47
8:38
+0:21
20M
20.00 mi13:48:402:46:388:2011:54
8:46
+0:08
21M
21.00 mi13:57:412:55:398:229:01
9:01
+0:15
35K
21.75 mi14:03:543:01:528:226:13
8:19
-0:42
23M
23.00 mi14:14:293:12:278:2310:35
8:28
+0:09
24M
24.00 mi14:22:553:20:538:238:26
8:26
-0:02
40K
24.85 mi14:30:153:28:138:237:20
8:35
+0:09
25.2M
25.20 mi14:33:253:31:238:243:10
9:11
+0:36
FINISH
26.22 mi14:41:473:39:458:248:22
8:13
-0:58

Checkpoint Splits Visualizations

Explore your race data through different visual perspectives. Scroll to discover each visualization.

📈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

8:23 /mi

Slowest Pace

9:11 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Bar length shows time spent in each segment. Colors mark your faster to slower segments, relative to your own pace.

Time at Faster Pace

3:27:34

94% of race

Time at Steady Pace

12:11

6% of race

Time at Slower Pace

0:00

0% of race

Average Pace: 8:23 /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

Enhanced split table showing pace trends through mini sparkline visualizations.

Overall Pace Trend

CheckpointDistanceTime of DayTimeAvg PaceSegmentPaceTrendRank
5K
3.11 mi11:27:1225:108:0725:10
8:07
#17622
10K
6.21 mi11:52:4150:398:1025:29
8:13
#18113
15K
9.32 mi12:18:261:16:248:1225:45
8:18
#18358
20K
12.43 mi12:44:221:42:208:1525:56
8:21
#18368
HALF
13.11 mi12:49:551:47:538:145:33
8:09
#18346
25K
15.53 mi13:09:592:07:578:1520:04
8:17
#18164
30K
18.64 mi13:36:462:34:448:1926:47
8:38
#18032
20M
20.00 mi13:48:402:46:388:2011:54
8:46
#17971
21M
21.00 mi13:57:412:55:398:229:01
9:01
#17873
35K
21.75 mi14:03:543:01:528:226:13
8:19
#17805
23M
23.00 mi14:14:293:12:278:2310:35
8:28
#17649
24M
24.00 mi14:22:553:20:538:238:26
8:26
#17566
40K
24.85 mi14:30:153:28:138:237:20
8:35
#17485
25.2M
25.20 mi14:33:253:31:238:243:10
9:11
#17451
FINISH
26.22 mi14:41:473:39:458:248:22
8:13
#17417
Faster pace
Steady pace
Slower pace

Rankings

Your position at each checkpoint and how you ranked in each segment

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallFemalesF50-54Seg. OverallSeg. FemalesSeg. F50-54
5K3.11 mi3.11 mi176226286628618911(Top 65%)6984(Top 56%)6984(Top 566%)
10K6.21 mi3.10 mi18113-4916566-2806566-28018593(Top 64%)6795(Top 54%)6795(Top 551%)
15K9.32 mi3.11 mi18358-2456687-1216687-12118911(Top 65%)6984(Top 56%)6984(Top 566%)
20K12.43 mi3.11 mi18368-106689-26689-218400(Top 63%)6740(Top 54%)6740(Top 547%)
HALF13.11 mi0.68 mi18346+226680+96680+918091(Top 62%)6519(Top 52%)6519(Top 529%)
25K15.53 mi2.42 mi18164+1826590+906590+9017297(Top 60%)6164(Top 49%)6164(Top 500%)
30K18.64 mi3.11 mi18032+1326557+336557+3317588(Top 61%)6441(Top 51%)6441(Top 522%)
20M20.00 mi1.36 mi17971+616543+146543+1417767(Top 61%)6620(Top 53%)6620(Top 537%)
21M21.00 mi1.00 mi17873+986499+446499+4416256(Top 56%)5841(Top 46%)5841(Top 474%)
35K21.75 mi0.75 mi17805+686477+226477+2216524(Top 57%)6048(Top 48%)6048(Top 491%)
23M23.00 mi1.25 mi17649+1566416+616416+6115468(Top 53%)5535(Top 44%)5535(Top 449%)
24M24.00 mi1.00 mi17566+836387+296387+2916524(Top 57%)6203(Top 49%)6203(Top 503%)
40K24.85 mi0.85 mi17485+816358+296358+2916192(Top 56%)6086(Top 48%)6086(Top 494%)
25.2M25.20 mi0.35 mi17451+346352+66352+615781(Top 54%)5854(Top 47%)5854(Top 475%)
FINISH26.22 mi1.02 mi17417+346351+16351+116501(Top 57%)6225(Top 49%)6225(Top 505%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 65%
×21
+97ft-345ft

Overall

18911

Females

6984

F50-54

6984

5K→10K

3.1 - 6.2 mi

Top 64%
×5
+79ft-138ft

Overall

18593

Females

6795

F50-54

6795

10K→15K

6.2 - 9.3 mi

Top 65%
×3
+67ft-78ft

Overall

18911

Females

6984

F50-54

6984

15K→20K

9.3 - 12.4 mi

Top 63%
×5
+106ft-86ft

Overall

18400

Females

6740

F50-54

6740

20K→HALF

12.4 - 13.1 mi

Top 62%
×2
+19ft-37ft

Overall

18091

Females

6519

F50-54

6519

HALF→25K

13.1 - 15.5 mi

Top 60%
×4
+66ft-88ft

Overall

17297

Females

6164

F50-54

6164

25K→30K

15.5 - 18.6 mi

Top 61%
×9
+181ft-148ft

Overall

17588

Females

6441

F50-54

6441

30K→20M

18.6 - 20.0 mi

Top 61%
×5
+64ft-50ft

Overall

17767

Females

6620

F50-54

6620

20M→21M

20.0 - 21.0 mi

Top 56%
×8
+106ft-24ft

Overall

16256

Females

5841

F50-54

5841

21M→35K

21.0 - 21.8 mi

Top 57%
×7
+17ft-86ft

Overall

16524

Females

6048

F50-54

6048

35K→23M

21.8 - 23.0 mi

Top 53%
×5
+23ft-63ft

Overall

15468

Females

5535

F50-54

5535

23M→24M

23.0 - 24.0 mi

Top 57%
×6
+12ft-82ft

Overall

16524

Females

6203

F50-54

6203

24M→40K

24.0 - 24.9 mi

Top 56%
×1
+6ft-20ft

Overall

16192

Females

6086

F50-54

6086

40K→25.2M

24.9 - 25.2 mi

Top 54%
×1
+13ft-16ft

Overall

15781

Females

5854

F50-54

5854

25.2M→FINISH

25.2 - 26.2 mi

Top 57%
×2
+22ft-21ft

Overall

16501

Females

6225

F50-54

6225

Passing

Athletes you passed and who passed you throughout the race

Passing Analysis

Category:
Athletes Passed
1748*
Passed By
999
Net Change
+205
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#17622
5K → 10K112200-491#17622#18113
10K → 15K96200-245#18113#18358
15K → 20K160170-10#18358#18368
20K → HALF4523+22#18368#18346
HALF → 25K214*32+182#18346#18164
25K → 30K249*117+132#18164#18032
30K → 20M12665+61#18032#17971
20M → 21M13436+98#17971#17873
21M → 35K9628+68#17873#17805
35K → 23M17216+156#17805#17649
23M → 24M10926+83#17649#17566
24M → 40K11231+81#17566#17485
40K → 25.2M4915+34#17485#17451
25.2M → FINISH7440+34#17451#17417
TOTALS1748*999+205

* Includes athletes who did not complete a segment (DNF/DNQ).

📊

Passing Analysis Visualizations

Explore your passing analysis through 5 different visualizations. Scroll to discover each one.

Time:
Category:

📈Position Graph

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🎨Heatmap Timeline

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🔄Passing Circle

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🌊Position Flow

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🏃Race Lanes

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Qualifying & Age Grade

See how your performance stacks up against qualifying standards

OTQ

Olympic Trials Qualifying analysis available

Activity Data

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Public Race Data

Boston Athletic Association

Boston Athletic Association

Mika Timing

Mika Timing