42km

Boston Marathon BAA – Level 2

Boston Athletic Association

Intermediate20 weeks43 mi4 workouts per week
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About the plan

A 20-week plan for the runner who has already run a marathon and trains five days a week. It is Level 2 of the official schedule that the Boston Athletic Association publishes for Boston Marathon entrants. Volume goes from 29 miles (47 km) in the first week to 43 miles (69 km) in week 17, with two rest days — the BAA suggests cycling, swimming or strength training on those days, but no running is prescribed. The week has two quality sessions: track on Tuesday and a threshold or marathon-pace workout on the weekend, plus easy runs and the Sunday long run. The signature of the method is the sandwich set: a block of repeats at a hard pace followed, without a long rest, by a block of the same size at marathon pace — this is how the BAA teaches the body to hold target pace on tired legs, which is exactly what Boston demands after the Newton hills. Compared with Level 1, the density changes: more days of easy running, longer threshold sets and a Sunday that often combines an easy base with a big block at marathon pace, reaching 19 miles (30 km) for the day. The pure long run goes from 10 to 13 miles (16 to 21 km) and the biggest target-pace rehearsal is 11 continuous miles (17 km) in week 18. The last two weeks are the taper. Week 20 is the last week of training and ends on Sunday, exactly as the BAA publishes it; the marathon comes the next day, on day 141 of the plan, because Boston is run on Patriots' Day Monday. If your race is on a Sunday, activate the plan by entering the race date: the whole plan shifts by one day and each workout lands in the same spot of the official schedule again. All paces come from your times in the magic calculator; adjust the reference race time in your profile before starting so that threshold, interval and race paces come out calibrated.

The plan in numbers

Duration
20 weeks
Runs per week
4
Weekly volume
29 mi → 43 mi · 12 min
Longest run
19 mi

Week 1 starts at 29 mi and volume builds to 43 mi · 12 min in week 17, the heaviest of the plan.

A typical week has 4 runs, and the longest session reaches 19 mi (Marathon, week 17).

Over the final 4 weeks volume drops from 43 mi · 12 min to 17 mi · 6 min so you arrive at the race rested.

Race day (26 mi) falls on Monday of week 21, with no runs earlier that week.

Key workouts

The quality sessions that come up most in this plan:

  • Interval19 sessions across 17 weeks
  • Marathon12 sessions across 12 weeks
  • Threshold12 sessions across 10 weeks
  • Long4 sessions across 4 weeks

Who it's for

Intermediate level. To start safely you should already be running about 29 mi per week and be comfortable with a 10 mi session — that is what week 1 asks for.

Week 1 — workout preview

29 mi this week

MonDay 1
Easy

5.5 mi

TueDay 2
Rest
WedDay 3
Easy

7 mi

ThuDay 4
Rest
FriDay 5
Easy

6.5 mi

SatDay 6
Rest
SunDay 7
Long

10 mi

Week 17 — the heaviest of the plan

43 mi · 12 min this week

MonDay 113
Rest
TueDay 114
Threshold

8.9 mi · 12 min

WedDay 115
Easy

7 mi

ThuDay 116
Rest
FriDay 117
Threshold

8 mi

SatDay 118
Rest
SunDay 119
Marathon

19 mi

Plan Structure

21 weeks · 88 workouts · 53 rest days

W1
W2
W3
W4
W5
W6
W7
W8
W9
W10
W11
W12
W13
W14
W15
W16
W17
W18
W19
W20
W21
Easy
Interval
Threshold
Marathon
Long
Race
Rest

See the full plan

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