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BOSTON MARATHON 2023

Jason Bosslett

NJ

Bib: 10809 M

0:00
0:00
/ mi
Masters
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Overall
#0 / 26622
Top 34%
Gender (Male)
#0 / 15176
Top 49%
Masters (Masters Men)
#0 / 9891
Top 38%
Division (M45-49)
#0 / 2252
Race Day Weather
49°/39°F
light intensity drizzle

Race Timeline

Ribbon color based on
FasterSteadySlower· vs. your average pace
Start
0:00
Race begins
469 ft elev
5K· 3.11 mi
7:19/mi
22:45
↑ 97↓ 3451.5%
220 ft elev
10K· 6.21 mi
7:10/mi
45:01
↑ 79↓ 1380.4%
157 ft elev
15K· 9.32 mi
7:10/mi
1:07:17
↑ 67↓ 78
146 ft elev
20K· 12.43 mi
7:18/mi
1:29:58
↑ 106↓ 860.1%
165 ft elev
Half· 13.11 mi
7:15/mi
1:34:55
↑ 19↓ 370.5%
148 ft elev
25K· 15.53 mi
7:21/mi
1:52:45
↑ 66↓ 880.2%
127 ft elev
30K· 18.64 mi
7:45/mi
2:16:51
↑ 181↓ 1480.2%
138 ft elev
20M
7:58/mi
2:27:41
↑ 64↓ 500.2%
148 ft elev
21M
8:26/mi
2:36:07
↑ 106↓ 241.6%
227 ft elev
35K· 21.75 mi
8:26/mi
2:42:26
↑ 17↓ 861.7%
156 ft elev
23M
8:18/mi
2:52:49
↑ 23↓ 630.6%
116 ft elev
24M
7:56/mi
3:00:45
↓ 821.3%
34 ft elev
40K· 24.85 mi
8:21/mi
3:07:53
↓ 200.3%
20 ft elev
25.2M
9:25/mi
3:11:08
↑ 13↓ 160.2%
18 ft elev
Finish· 26.22 mi
8:37/mi
3:19:55
↑ 22↓ 21
17 ft elev
Course Elevation
7–469 ft
≈
×2stacked redwood trees
•▲ 890 ft climb · ▼ 1342 ft descent

The Course

Half Splits

1st Half· via Half
1:34:557:14 /mi⚡ faster
2nd Half
1:45:008:01 /mi+10.6%
Positive split — 10.6% slower in the second half
Is this your race?

Your race, unpacked

See your splits, ranks & AI insights.

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi10:49:5322:457:1922:45
7:19
-
10K
6.21 mi11:12:0945:017:1522:16
7:10
-0:09
15K
9.32 mi11:34:251:07:177:1322:16
7:10
0:00
20K
12.43 mi11:57:061:29:587:1422:41
7:18
+0:08
Half
13.11 mi12:02:031:34:557:144:57
7:15
-0:03
25K
15.53 mi12:19:531:52:457:1517:50
7:21
+0:06
30K
18.64 mi12:43:592:16:517:2024:06
7:45
+0:24
20M
20.00 mi12:54:492:27:417:2310:50
7:58
+0:13
21M
21.00 mi13:03:152:36:077:268:26
8:26
+0:28
35K
21.75 mi13:09:342:42:267:286:19
8:26
0:00
23M
23.00 mi13:19:572:52:497:3110:23
8:18
-0:08
24M
24.00 mi13:27:533:00:457:327:56
7:56
-0:22
40K
24.85 mi13:35:013:07:537:347:08
8:21
+0:25
25.2M
25.20 mi13:38:163:11:087:353:15
9:25
+1:04
Finish
26.22 mi13:47:033:19:557:388:47
8:37
-0:48

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

7:10 /mi

Average Pace

7:38 /mi

Slowest Pace

9:25 /mi

Loading chart...
Fastest
Middle
Slowest
Average

Segments

Segment Time Comparison

Time at Faster Pace

1:52:45

56% of race

Time at Steady Pace

42:52

21% of race

Time at Slower Pace

44:18

22% of race

Average Pace: 7:37 /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 mi10:49:5322:457:1922:45
7:19
#8281
10K
6.21 mi11:12:0945:017:1522:16
7:10
#8090
15K
9.32 mi11:34:251:07:177:1322:16
7:10
#7899
20K
12.43 mi11:57:061:29:587:1422:41
7:18
#7831
Half
13.11 mi12:02:031:34:557:144:57
7:15
#7847
25K
15.53 mi12:19:531:52:457:1517:50
7:21
#7782
30K
18.64 mi12:43:592:16:517:2024:06
7:45
#7952
20M
20.00 mi12:54:492:27:417:2310:50
7:58
#8053
21M
21.00 mi13:03:152:36:077:268:26
8:26
#8151
35K
21.75 mi13:09:342:42:267:286:19
8:26
#8415
23M
23.00 mi13:19:572:52:497:3110:23
8:18
#8568
24M
24.00 mi13:27:533:00:457:327:56
7:56
#8655
40K
24.85 mi13:35:013:07:537:347:08
8:21
#8769
25.2M
25.20 mi13:38:163:11:087:353:15
9:25
#8859
Finish
26.22 mi13:47:033:19:557:388:47
8:37
#9174
Faster pace
Steady pace
Slower pace
Est.Checkpoint not recorded (estimated)
~Segment time uses estimated prior

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM45-49Seg. OverallSeg. MalesSeg. M45-49
5K3.11 mi3.11 mi828171467146758766496649
10K6.21 mi3.10 mi8090+1917012+1347012+134789668656865
15K9.32 mi3.11 mi7899+1916890+1226890+122758766496649
20K12.43 mi3.11 mi7831+686825+656825+65781467606760
Half13.11 mi0.68 mi7847-166836-116836-11834870897089
25K15.53 mi2.42 mi7782+656773+636773+63767865896589
30K18.64 mi3.11 mi7952-1706847-746847-74904873087308
20M20.00 mi1.36 mi8053-1016890-436890-431011778057805
21M21.00 mi1.00 mi8151-986931-416931-411012776587658
35K21.75 mi0.75 mi8415-2647091-1607091-1601492498299829
23M23.00 mi1.25 mi8568-1537162-717162-711188684078407
24M24.00 mi1.00 mi8655-877191-297191-291083478077807
40K24.85 mi0.85 mi8769-1147231-407231-401240284868486
25.2M25.20 mi0.35 mi8859-907275-447275-441494496249624
Finish26.22 mi1.02 mi9174-3157436-1617436-161161271021010210

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 28%
×21story building
+97ft-345ft

Overall

7587

Males

6649

M45-49

6649

5K→10K

3.1 - 6.2 mi

Top 30%
×5story building
+79ft-138ft

Overall

7896

Males

6865

M45-49

6865

10K→15K

6.2 - 9.3 mi

Top 28%
×3story building
+67ft-78ft

Overall

7587

Males

6649

M45-49

6649

15K→20K

9.3 - 12.4 mi

Top 29%
×5story building
+106ft-86ft

Overall

7814

Males

6760

M45-49

6760

20K→Half

12.4 - 13.1 mi

Top 31%
×2story building
+19ft-37ft

Overall

8348

Males

7089

M45-49

7089

Half→25K

13.1 - 15.5 mi

Top 29%
×4story building
+66ft-88ft

Overall

7678

Males

6589

M45-49

6589

25K→30K

15.5 - 18.6 mi

Top 34%
×9story building
+181ft-148ft

Overall

9048

Males

7308

M45-49

7308

30K→20M

18.6 - 20.0 mi

Top 38%
×5story building
+64ft-50ft

Overall

10117

Males

7805

M45-49

7805

20M→21M

20.0 - 21.0 mi

Top 38%
×8story building
+106ft-24ft

Overall

10127

Males

7658

M45-49

7658

21M→35K

21.0 - 21.8 mi

Top 56%
×7story building
+17ft-86ft

Overall

14924

Males

9829

M45-49

9829

35K→23M

21.8 - 23.0 mi

Top 45%
×5story building
+23ft-63ft

Overall

11886

Males

8407

M45-49

8407

23M→24M

23.0 - 24.0 mi

Top 41%
×6story building
+12ft-82ft

Overall

10834

Males

7807

M45-49

7807

24M→40K

24.0 - 24.9 mi

Top 47%
×1story
+6ft-20ft

Overall

12402

Males

8486

M45-49

8486

40K→25.2M

24.9 - 25.2 mi

Top 56%
×1story
+13ft-16ft

Overall

14944

Males

9624

M45-49

9624

25.2M→Finish

25.2 - 26.2 mi

Top 61%
×2story building
+22ft-21ft

Overall

16127

Males

10210

M45-49

10210

Passing Analysis

Category:
Athletes Passed
1206
Passed By
2099
Net Change
-893
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#8281
5K → 10K344153+191#8281#8090
10K → 15K25059+191#8090#7899
15K → 20K15082+68#7899#7831
20K → Half1733-16#7831#7847
Half → 25K12560+65#7847#7782
25K → 30K77247-170#7782#7952
30K → 20M56157-101#7952#8053
20M → 21M37135-98#8053#8151
21M → 35K10274-264#8151#8415
35K → 23M47200-153#8415#8568
23M → 24M43130-87#8568#8655
24M → 40K32146-114#8655#8769
40K → 25.2M11101-90#8769#8859
25.2M → Finish7322-315#8859#9174
TOTALS12062099-893

Passing Charts

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