Safi Chalfin-Smith
Bib: 26806•F
MA
⏱️ Race Timeline
The Course
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Half Splits
Checkpoint Splits
| Checkpoint | Distance | Time of Day | Time | Avg Pace | Segment Time | Segment Pace | Diff |
|---|---|---|---|---|---|---|---|
5K | 3.11 mi | 11:51:21 | 28:33 | 9:11 | 28:33 | 9:11 | - |
10K | 6.21 mi | 12:18:47 | 55:59 | 9:01 | 27:26 | 8:50 | -0:21 |
15K | 9.32 mi | 12:45:56 | 1:23:08 | 8:55 | 27:09 | 8:44 | -0:06 |
20K | 12.43 mi | 13:14:38 | 1:51:50 | 9:00 | 28:42 | 9:14 | +0:30 |
Half | 13.11 mi | 13:20:46 | 1:57:58 | 9:00 | 6:08 | 8:59 | -0:15 |
25K | 15.53 mi | 13:47:48 | 2:25:00 | 9:20 | 27:02 | 11:09 | +2:10 |
30K | 18.64 mi | 14:26:11 | 3:03:23 | 9:50 | 38:23 | 12:21 | +1:12 |
20M | 20.00 mi | 14:41:26 | 3:18:38 | 9:56 | 15:15 | 11:13 | -1:08 |
21M | 21.00 mi | 14:55:11 | 3:32:23 | 10:07 | 13:45 | 13:45 | +2:32 |
35K | 21.75 mi | 15:02:45 | 3:39:57 | 10:07 | 7:34 | 10:07 | -3:38 |
23M | 23.00 mi | 15:17:20 | 3:54:32 | 10:12 | 14:35 | 11:39 | +1:32 |
24M | 24.00 mi | 15:27:06 | 4:04:18 | 10:11 | 9:46 | 9:46 | -1:53 |
40K | 24.85 mi | 15:36:19 | 4:13:31 | 10:12 | 9:13 | 10:47 | +1:01 |
25.2M | 25.20 mi | 15:40:23 | 4:17:35 | 10:13 | 4:04 | 11:48 | +1:01 |
Finish | 26.22 mi | 15:50:33 | 4:27:45 | 10:13 | 10:10 | 9:59 | -1:49 |
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
10:13 /mi
Slowest Pace
13:45 /mi
📊Segments
Segment Time Comparison
Time at Faster Pace
1:57:58
44% of race
Time at Steady Pace
36:43
14% of race
Time at Slower Pace
1:53:04
42% of race
Average Pace: 10:13 /mi
🎨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.
Click or hover over segments to see details
✨Sparklines
Checkpoint Splits with Pace Trends
Overall Pace Trend
| Checkpoint | Distance | Time of Day | Time | Avg Pace | Segment | Pace | Trend | Rank |
|---|---|---|---|---|---|---|---|---|
5K | 3.11 mi | 11:51:21 | 28:33 | 9:11 | 28:33 | 9:11 | #20773 | |
10K | 6.21 mi | 12:18:47 | 55:59 | 9:01 | 27:26 | 8:50 | #19956 | |
15K | 9.32 mi | 12:45:56 | 1:23:08 | 8:55 | 27:09 | 8:44 | #19223 | |
20K | 12.43 mi | 13:14:38 | 1:51:50 | 9:00 | 28:42 | 9:14 | #18962 | |
Half | 13.11 mi | 13:20:46 | 1:57:58 | 9:00 | 6:08 | 8:59 | #18914 | |
25K | 15.53 mi | 13:47:48 | 2:25:00 | 9:20 | 27:02 | 11:09 | #19637 | |
30K | 18.64 mi | 14:26:11 | 3:03:23 | 9:50 | 38:23 | 12:21 | #20347 | |
20M | 20.00 mi | 14:41:26 | 3:18:38 | 9:56 | 15:15 | 11:13 | #20294 | |
21M | 21.00 mi | 14:55:11 | 3:32:23 | 10:07 | 13:45 | 13:45 | #20420 | |
35K | 21.75 mi | 15:02:45 | 3:39:57 | 10:07 | 7:34 | 10:07 | #20309 | |
23M | 23.00 mi | 15:17:20 | 3:54:32 | 10:12 | 14:35 | 11:39 | #20279 | |
24M | 24.00 mi | 15:27:06 | 4:04:18 | 10:11 | 9:46 | 9:46 | #20082 | |
40K | 24.85 mi | 15:36:19 | 4:13:31 | 10:12 | 9:13 | 10:47 | #19984 | |
25.2M | 25.20 mi | 15:40:23 | 4:17:35 | 10:13 | 4:04 | 11:48 | #19931 | |
Finish | 26.22 mi | 15:50:33 | 4:27:45 | 10:13 | 10:10 | 9:59 | #19856 |
Checkpoint and Segment Rankings
| Checkpoint | Distance | Seg. Dist | Overall | Females | F18-39 | Seg. Overall | Seg. Females | Seg. F18-39 |
|---|---|---|---|---|---|---|---|---|
| 5K | 3.11 mi | 3.11 mi | 20773 | 8289 | 8289 | 17687(Top 69%) | 6535(Top 60%) | 6535(Top 140%) |
| 10K | 6.21 mi | 3.10 mi | 19956+817 | 7846+443 | 7846+443 | 19008(Top 74%) | 7299(Top 67%) | 7299(Top 157%) |
| 15K | 9.32 mi | 3.11 mi | 19223+733 | 7420+426 | 7420+426 | 17687(Top 69%) | 6535(Top 60%) | 6535(Top 140%) |
| 20K | 12.43 mi | 3.11 mi | 18962+261 | 7270+150 | 7270+150 | 18343(Top 72%) | 6906(Top 63%) | 6906(Top 148%) |
| Half | 13.11 mi | 0.68 mi | 18914+48 | 7249+21 | 7249+21 | 18273(Top 72%) | 6943(Top 64%) | 6943(Top 149%) |
| 25K | 15.53 mi | 2.42 mi | 19637-723 | 7651-402 | 7651-402 | 21778(Top 85%) | 8871(Top 81%) | 8871(Top 190%) |
| 30K | 18.64 mi | 3.11 mi | 20347-710 | 8074-423 | 8074-423 | 22499(Top 88%) | 9404(Top 86%) | 9404(Top 202%) |
| 20M | 20.00 mi | 1.36 mi | 20294+53 | 8083-9 | 8083-9 | 19805(Top 78%) | 8124(Top 74%) | 8124(Top 174%) |
| 21M | 21.00 mi | 1.00 mi | 20420-126 | 8171-88 | 8171-88 | 21982(Top 86%) | 9277(Top 85%) | 9277(Top 199%) |
| 35K | 21.75 mi | 0.75 mi | 20309+111 | 8136+35 | 8136+35 | 17544(Top 69%) | 7117(Top 65%) | 7117(Top 153%) |
| 23M | 23.00 mi | 1.25 mi | 20279+30 | 8141-5 | 8141-5 | 20002(Top 78%) | 8400(Top 77%) | 8400(Top 180%) |
| 24M | 24.00 mi | 1.00 mi | 20082+197 | 8055+86 | 8055+86 | 15545(Top 61%) | 6229(Top 57%) | 6229(Top 134%) |
| 40K | 24.85 mi | 0.85 mi | 19984+98 | 8019+36 | 8019+36 | 17523(Top 69%) | 7284(Top 67%) | 7284(Top 156%) |
| 25.2M | 25.20 mi | 0.35 mi | 19931+53 | 7997+22 | 7997+22 | 16875(Top 66%) | 6985(Top 64%) | 6985(Top 150%) |
| Finish | 26.22 mi | 1.02 mi | 19856+75 | 7974+23 | 7974+23 | 18311(Top 72%) | 7649(Top 70%) | 7649(Top 164%) |
Segment Performance Analysis
10K→15K
0.0 - 3.1 mi
Overall
17687
Females
6535
F18-39
6535
5K→10K
3.1 - 6.2 mi
Overall
19008
Females
7299
F18-39
7299
10K→15K
6.2 - 9.3 mi
Overall
17687
Females
6535
F18-39
6535
15K→20K
9.3 - 12.4 mi
Overall
18343
Females
6906
F18-39
6906
20K→Half
12.4 - 13.1 mi
Overall
18273
Females
6943
F18-39
6943
Half→25K
13.1 - 15.5 mi
Overall
21778
Females
8871
F18-39
8871
25K→30K
15.5 - 18.6 mi
Overall
22499
Females
9404
F18-39
9404
30K→20M
18.6 - 20.0 mi
Overall
19805
Females
8124
F18-39
8124
20M→21M
20.0 - 21.0 mi
Overall
21982
Females
9277
F18-39
9277
21M→35K
21.0 - 21.8 mi
Overall
17544
Females
7117
F18-39
7117
35K→23M
21.8 - 23.0 mi
Overall
20002
Females
8400
F18-39
8400
23M→24M
23.0 - 24.0 mi
Overall
15545
Females
6229
F18-39
6229
24M→40K
24.0 - 24.9 mi
Overall
17523
Females
7284
F18-39
7284
40K→25.2M
24.9 - 25.2 mi
Overall
16875
Females
6985
F18-39
6985
25.2M→Finish
25.2 - 26.2 mi
Overall
18311
Females
7649
F18-39
7649
Passing Analysis
| Segment | Athletes Passed | Passed By | Net Change | Start Rank | End Rank |
|---|---|---|---|---|---|
| Start → 5K | - | - | - | - | #20773 |
| 5K → 10K | 858 | 41 | +817 | #20773 | #19956 |
| 10K → 15K | 745 | 12 | +733 | #19956 | #19223 |
| 15K → 20K | 384 | 123 | +261 | #19223 | #18962 |
| 20K → Half | 64 | 16 | +48 | #18962 | #18914 |
| Half → 25K | 48 | 771 | -723 | #18914 | #19637 |
| 25K → 30K | 31 | 741 | -710 | #19637 | #20347 |
| 30K → 20M | 110 | 57 | +53 | #20347 | #20294 |
| 20M → 21M | 33 | 159 | -126 | #20294 | #20420 |
| 21M → 35K | 119 | 8 | +111 | #20420 | #20309 |
| 35K → 23M | 90 | 60 | +30 | #20309 | #20279 |
| 23M → 24M | 198 | 1 | +197 | #20279 | #20082 |
| 24M → 40K | 113 | 15 | +98 | #20082 | #19984 |
| 40K → 25.2M | 64 | 11 | +53 | #19984 | #19931 |
| 25.2M → Finish | 92 | 17 | +75 | #19931 | #19856 |
| TOTALS | 2949 | 2032 | +917 |
Passing Visuals
🔄Passing Circle
🌊Position Flow
🏃Race Lanes
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Public Race Data
Enhanced athlete results built from publicly available data.
Race managed by
Boston Athletic Association
Race timed by
Mika Timing
