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Half Marathon 21K
The next big challenge

How to train for
half marathon

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21.097 km of achievement·15+ plans·$9.99 per month

Half marathon plans for all levels.

From beginner to advanced, find the perfect plan for your 21K

New

Lydiard Aerobic Base – 12 Weeks

Intermediate

Arthur Lydiard

12 weeks
4–7 h/week
10km21km

Faster Road Racing: Base 1

Beginner

Pete Pfitzinger

10 weeks
31 mi
5km10km21km

Faster Road Racing: Base 2

Intermediate

Pete Pfitzinger

10 weeks
47 mi
5km10km21km

Are you ready for 21K?

10K base

Be able to run 10K comfortably before starting the plan

10-14 weeks available

Allow enough time for proper preparation

Consistent weekly volume

Be running at least 25-30km per week regularly

Race experience

Ideally have already participated in 5K or 10K races

Training phases.

Weeks 1-3

Base

Building volume and endurance

Weeks 4-8

Development

Specific workouts and increasing long runs

Weeks 9-11

Peak

Maximum volume and race pace work

Weeks 12-14

Taper

Gradual reduction and recovery

Typical training week.

Four to five runs a week: two quality sessions, one long run and the rest at an easy pace.

Mon

Rest

Off or mobility

Tue

Intervals

800 m to 1 km reps at 10K pace

Wed

Easy

30–45 min at conversational pace

Thu

Tempo run

20–30 min at threshold or half marathon pace

Fri

Rest

Off or strength work

Sat

Easy

30–40 min with 4–6 strides

Sun

Long run

10 to 18 km at a comfortable pace

Sample plan over 12 weeks.

A typical progression for runners aiming for about 2 hours who already run 25–30 km a week. The catalogue plans adjust the numbers and paces to your level.

Sample 12-week half marathon plan with weekly volume, long run and key workout
WeekPhaseVolumeLong runKey workout
1Base30 km10 kmFartlek 6 × 1 min
2Base32 km11 kmFartlek 8 × 1 min
3Base35 km12 kmTempo run 15 min
4Recovery28 km10 kmEasy + 6 × 100 m strides
5Development36 km13 kmTempo run 20 min
6Development38 km14 km5 × 1 km at 10K pace
7Development40 km15 kmTempo run 25 min
8Recovery32 km12 kmEasy + 6 × 100 m strides
9Peak42 km16 km3 × 3 km at half marathon pace
10Peak44 km18 km2 × 5 km at half marathon pace
11Taper34 km12 kmTempo run 15 min + strides
12Race20 km21.1 kmHalf marathon (21.1 km)

Weeks 4 and 8 cut volume so the training can be absorbed. In race week, volume includes the 21.1 km.

Time goals for half marathon.

Beginner

Sub 2h15 — 6:23/km

Goal for those running their first half

Intermediate

Sub 2h00 — 5:41/km

An important milestone for many runners

Advanced

Sub 1h45 — 4:58/km

Requires dedication and consistent volume

Elite

Sub 1h30 — 4:16/km

Regional/national competitive level

Essential elements of training.

Weekly long run

Long run of 16-22km, fundamental for endurance

Pace workouts

Tempo runs and progressives at half marathon pace

Nutrition

Test your gel strategy during long runs

Recovery

Sleep and rest days are part of training

Tips for your half marathon.

Start conservative

The first 5km should be at target pace or slightly slower.

Split it mentally

Think of the race as 2 runs: 15km of preparation + 6km of execution.

Respect the taper

Reduce volume in the last 2 weeks. That's when your body absorbs the training.

Trust your training

If you followed the plan, you're ready. Doubt is normal.

Frequently asked questions.

Simple. No surprises.

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