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BOSTON MARATHON 2025

Aleksandr Gelfond

Bib: 3303•M

SC

0:00
0:00
/ mi
Masters
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Overall
#0 / 28404
Top 49%
Gender (Male)
#0 / 16105
Masters (Masters Men)
#0 / 10463
Division (M40-44)
#0 / 2247
Race Day Weather
50°/40°F
broken clouds

⏱️ Race Timeline

Start
0:00:00
Race begins
5K· 3.11 mi
23:37
Rank: #13122
Start → 5K
23:37 | 7:36/mi
10K· 6.21 mi
46:58
Rank: #12647 (+475)
5K → 10K
23:21 | 7:31/mi
15K· 9.32 mi
1:10:38
Rank: #12672 (-25)
10K → 15K
23:40 | 7:37/mi
20K· 12.43 mi
1:35:11
Rank: #12995 (-323)
15K → 20K
24:33 | 7:54/mi
Half· 13.11 mi
1:40:18
Rank: #12911 (+84)
20K → Half
5:07 | 7:30/mi
25K· 15.53 mi
1:59:41
Rank: #13054 (-143)
Half → 25K
19:23 | 8:00/mi
30K· 18.64 mi
2:26:16
Rank: #13453 (-399)
25K → 30K
26:35 | 8:33/mi
20M
2:37:54
Rank: #13489 (-36)
30K → 20M
11:38 | 8:34/mi
21M
2:47:11
Rank: #13557 (-68)
20M → 21M
9:17 | 9:17/mi
35K· 21.75 mi
2:53:30
Rank: #13610 (-53)
21M → 35K
6:19 | 8:27/mi
23M
3:03:58
Rank: #13502 (+108)
35K → 23M
10:28 | 8:22/mi
24M
3:13:35
Rank: #13931 (-429)
23M → 24M
9:37 | 9:37/mi
40K· 24.85 mi
3:20:50
Rank: #13890 (+41)
24M → 40K
7:15 | 8:29/mi
25.2M
3:23:58
Rank: #13836 (+54)
40K → 25.2M
3:08 | 9:05/mi
Finish· 26.22 mi
3:32:14
Rank: #13810 (+26)
25.2M → Finish
8:16 | 8:07/mi

The Course

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Half Splits

1st Half· via HalfFaster
Distance13.11 mi
Time1:40:18
Pace7:39 /mi
2nd Half
Distance13.11 mi
Time1:51:56
Pace8:32 /mi
📊Positive Split: 11.6% slower second half

Checkpoint Splits

CheckpointDistanceTime of DayTimeAvg PaceSegment TimeSegment PaceDiff
5K
3.11 mi11:14:3823:377:3623:37
7:36
-
10K
6.21 mi11:37:5946:587:3423:21
7:31
-0:05
15K
9.32 mi12:01:391:10:387:3523:40
7:37
+0:06
20K
12.43 mi12:26:121:35:117:4024:33
7:54
+0:17
Half
13.11 mi12:31:191:40:187:395:07
7:30
-0:24
25K
15.53 mi12:50:421:59:417:4219:23
8:00
+0:30
30K
18.64 mi13:17:172:26:167:5126:35
8:33
+0:33
20M
20.00 mi13:28:552:37:547:5411:38
8:34
+0:01
21M
21.00 mi13:38:122:47:117:589:17
9:17
+0:43
35K
21.75 mi13:44:312:53:307:596:19
8:27
-0:50
23M
23.00 mi13:54:593:03:588:0010:28
8:22
-0:05
24M
24.00 mi14:04:363:13:358:049:37
9:37
+1:15
40K
24.85 mi14:11:513:20:508:057:15
8:29
-1:08
25.2M
25.20 mi14:14:593:23:588:063:08
9:05
+0:36
Finish
26.22 mi14:23:153:32:148:068:16
8:07
-0:58

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

7:30 /mi

Average Pace

8:06 /mi

Slowest Pace

9:37 /mi

Loading chart...
Fastest
Middle
Slowest
Average

📊Segments

Segment Time Comparison

Time at Faster Pace

1:59:41

56% of race

Time at Steady Pace

1:10:31

33% of race

Time at Slower Pace

22:02

10% of race

Average Pace: 8:06 /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 mi11:14:3823:377:3623:37
7:36
#13122
10K
6.21 mi11:37:5946:587:3423:21
7:31
#12647
15K
9.32 mi12:01:391:10:387:3523:40
7:37
#12672
20K
12.43 mi12:26:121:35:117:4024:33
7:54
#12995
Half
13.11 mi12:31:191:40:187:395:07
7:30
#12911
25K
15.53 mi12:50:421:59:417:4219:23
8:00
#13054
30K
18.64 mi13:17:172:26:167:5126:35
8:33
#13453
20M
20.00 mi13:28:552:37:547:5411:38
8:34
#13489
21M
21.00 mi13:38:122:47:117:589:17
9:17
#13557
35K
21.75 mi13:44:312:53:307:596:19
8:27
#13610
23M
23.00 mi13:54:593:03:588:0010:28
8:22
#13502
24M
24.00 mi14:04:363:13:358:049:37
9:37
#13931
40K
24.85 mi14:11:513:20:508:057:15
8:29
#13890
25.2M
25.20 mi14:14:593:23:588:063:08
9:05
#13836
Finish
26.22 mi14:23:153:32:148:068:16
8:07
#13810
Faster pace
Steady pace
Slower pace

Checkpoint and Segment Rankings

CheckpointDistanceSeg. DistOverallMalesM40-44Seg. OverallSeg. MalesSeg. M40-44
5K3.11 mi3.11 mi131229699969912746(Top 45%)9404(Top 58%)9404(Top 419%)
10K6.21 mi3.10 mi12647+4759461+2389461+23812245(Top 43%)9260(Top 57%)9260(Top 412%)
15K9.32 mi3.11 mi12672-259446+159446+1512746(Top 45%)9404(Top 58%)9404(Top 419%)
20K12.43 mi3.11 mi12995-3239513-679513-6714092(Top 50%)9909(Top 62%)9909(Top 441%)
Half13.11 mi0.68 mi12911+849475+389475+3811691(Top 41%)8901(Top 55%)8901(Top 396%)
25K15.53 mi2.42 mi13054-1439512-379512-3713830(Top 49%)9668(Top 60%)9668(Top 430%)
30K18.64 mi3.11 mi13453-3999625-1139625-11315105(Top 53%)10100(Top 63%)10100(Top 449%)
20M20.00 mi1.36 mi13489-369603+229603+2214153(Top 50%)9524(Top 59%)9524(Top 424%)
21M21.00 mi1.00 mi13557-689595+89595+815042(Top 53%)9802(Top 61%)9802(Top 436%)
35K21.75 mi0.75 mi13610-539595959515099(Top 53%)9765(Top 61%)9765(Top 435%)
23M23.00 mi1.25 mi13502+1089509+869509+8612409(Top 44%)8426(Top 52%)8426(Top 375%)
24M24.00 mi1.00 mi13931-4299671-1629671-16220033(Top 71%)11873(Top 74%)11873(Top 528%)
40K24.85 mi0.85 mi13890+419614+579614+5713282(Top 47%)8657(Top 54%)8657(Top 385%)
25.2M25.20 mi0.35 mi13836+549581+339581+3312246(Top 43%)8129(Top 50%)8129(Top 362%)
Finish26.22 mi1.02 mi13810+269553+289553+2813658(Top 48%)8847(Top 55%)8847(Top 394%)

Segment Performance Analysis

10K→15K

0.0 - 3.1 mi

Top 45%
×21stories
+97ft-345ft

Overall

12746

Males

9404

M40-44

9404

5K→10K

3.1 - 6.2 mi

Top 43%
×5stories
+79ft-138ft

Overall

12245

Males

9260

M40-44

9260

10K→15K

6.2 - 9.3 mi

Top 45%
×3stories
+67ft-78ft

Overall

12746

Males

9404

M40-44

9404

15K→20K

9.3 - 12.4 mi

Top 50%
×5stories
+106ft-86ft

Overall

14092

Males

9909

M40-44

9909

20K→Half

12.4 - 13.1 mi

Top 41%
×2stories
+19ft-37ft

Overall

11691

Males

8901

M40-44

8901

Half→25K

13.1 - 15.5 mi

Top 49%
×4stories
+66ft-88ft

Overall

13830

Males

9668

M40-44

9668

25K→30K

15.5 - 18.6 mi

Top 53%
×9stories
+181ft-148ft

Overall

15105

Males

10100

M40-44

10100

30K→20M

18.6 - 20.0 mi

Top 50%
×5stories
+64ft-50ft

Overall

14153

Males

9524

M40-44

9524

20M→21M

20.0 - 21.0 mi

Top 53%
×8stories
+106ft-24ft

Overall

15042

Males

9802

M40-44

9802

21M→35K

21.0 - 21.8 mi

Top 53%
×7stories
+17ft-86ft

Overall

15099

Males

9765

M40-44

9765

35K→23M

21.8 - 23.0 mi

Top 44%
×5stories
+23ft-63ft

Overall

12409

Males

8426

M40-44

8426

23M→24M

23.0 - 24.0 mi

Top 71%
×6stories
+12ft-82ft

Overall

20033

Males

11873

M40-44

11873

24M→40K

24.0 - 24.9 mi

Top 47%
×1story
+6ft-20ft

Overall

13282

Males

8657

M40-44

8657

40K→25.2M

24.9 - 25.2 mi

Top 43%
×1story
+13ft-16ft

Overall

12246

Males

8129

M40-44

8129

25.2M→Finish

25.2 - 26.2 mi

Top 48%
×2stories
+22ft-21ft

Overall

13658

Males

8847

M40-44

8847

Passing Analysis

Category:
Athletes Passed
1885
Passed By
2573
Net Change
-688
SegmentAthletes PassedPassed ByNet ChangeStart RankEnd Rank
Start → 5K----#13122
5K → 10K590115+475#13122#12647
10K → 15K177202-25#12647#12672
15K → 20K118441-323#12672#12995
20K → Half873+84#12995#12911
Half → 25K113256-143#12911#13054
25K → 30K138537-399#13054#13453
30K → 20M111147-36#13453#13489
20M → 21M88156-68#13489#13557
21M → 35K3790-53#13557#13610
35K → 23M16153+108#13610#13502
23M → 24M19448-429#13502#13931
24M → 40K10362+41#13931#13890
40K → 25.2M628+54#13890#13836
25.2M → Finish8155+26#13836#13810
TOTALS18852573-688
📊

Passing Visuals

Category:
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🔥Passing Intensity

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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