42km

Hudson Marathon – Adaptive Running

Brad Hudson

Advanced18 weeks42–65 mi/week (68–105 km)6 workouts per week
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About the plan

Eighteen weeks of marathon training in Brad Hudson's adaptive method. The first four weeks are introductory, the next five develop threshold and aerobic power without choosing between the two, and the six weeks of the specific phase bring the central idea of the method: specific endurance. In practice, the long run stops being just long — in alternating weeks it ends with a marathon-pace block that grows from 7 to 9 and then 10 miles (12 to 14 and then 16 km), so the most important workout of the cycle looks more and more like the race. In the in-between weeks the long run goes back to pure and reaches 20 miles (32 km), so that pure endurance keeps rising in parallel. Hill sprints are present from start to finish, attached to the threshold session. Volume goes from 42 to 65 miles (68 to 105 km) per week, and the hardest specific long run totals 25 miles (40 km), 10 of them (16 km) at target pace. Two weeks of taper and race week close the cycle. For advanced marathoners who have already run the distance and want to go after a time. Reading note: Hudson's hill sprints appear as 10-second @repetição — they are maximal bursts up a steep hill with full recovery, and exist to recruit fast-twitch fiber and protect running mechanics, not to produce acidity. And the name of the method is literal: if a workout didn't go well, Hudson expects you to swap the next session rather than follow the plan to the letter.

The plan in numbers

Duration
18 weeks
Runs per week
6
Weekly volume
40 mi · 29 min → 65 mi · 13 min
Longest run
24 mi

Week 1 starts at 40 mi · 29 min and volume builds to 65 mi · 13 min in week 11, the heaviest of the plan.

A typical week has 6 runs, and the longest session reaches 24 mi (Marathon, week 13).

Over the final 7 weeks volume drops from 65 mi · 13 min to 16 mi so you arrive at the race rested.

Race day (27 mi) falls on Sunday of week 18; the week holds 16 mi of running before it.

Key workouts

The quality sessions that come up most in this plan:

  • Repetition15 sessions across 15 weeks
  • Long14 sessions across 14 weeks
  • Marathon10 sessions across 10 weeks
  • Interval9 sessions across 9 weeks

Who it's for

Advanced level. To start safely you should already be running about 40 mi · 29 min per week and be comfortable with a 11 mi session — that is what week 1 asks for.

Week 1 — workout preview

40 mi · 29 min this week

MonDay 1
Rest
TueDay 2
Repetition

6.2 mi · 13 min

WedDay 3
Easy

5.6 mi

ThuDay 4
Interval

3.1 mi · 16 min

FriDay 5
Easy

5.6 mi

SatDay 6
Marathon

8.1 mi

SunDay 7
Long

11 mi

Week 11 — the heaviest of the plan

65 mi · 13 min this week

MonDay 71
Rest
TueDay 72
Easy

9.3 mi

WedDay 73
Repetition

8.7 mi · 13 min

ThuDay 74
Easy

8.7 mi

FriDay 75
Easy

7.5 mi

SatDay 76
Easy

8.1 mi

SunDay 77
Marathon

22 mi

Plan Structure

18 weeks · 107 workouts · 19 rest days

W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
W11
W12
W13
W14
W15
W16
W17
W18
Easy
Repetition
Long
Marathon
Interval
Threshold
Rest

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