Distance: 20 km
Skill / Level: Intermediate (Trail focus)
Duration: 24 weeks
Workouts per week: 5–7
Weekly hours: 5–8
Includes: Running, Strength, Mobility, Stretch

Who is this plan for?

This plan is designed for intermediate trail runners with 1–3 years of consistent training who want a longer, structured 24-week build toward a 20K trail race. It’s ideal if you already have a solid base and prefer extra time to improve speed, endurance, and technical efficiency—so you can race stronger than “just finishing.”

What you’ll get

A 24-week progressive plan written in English by experienced trail running coaches at Arduua.

Running sessions prescribed by time and heart rate zones (not distance), so training adapts to your fitness.

Strength, mobility, and stretch workouts with detailed instructions and video links.

A smart, long-term progression that balances volume, intensity, and recovery—boosting performance while reducing injury risk.

Plan Structure

This plan follows the Arduua Training Methodology, expanded across 24 weeks of progressive phases:

Base Phase

Build aerobic endurance and overall conditioning

Improve mobility, stability, and core strength

Reinforce feet, ankles, and supporting structures for trail running

Specific Phase

Train aerobic and anaerobic thresholds

Develop VO₂ max and trail running efficiency

Build maximum strength, hill power, and trail-specific conditioning

Pre-Competitive Phase

Practice race-specific pacing, terrain skills, and sustained efforts

Refine nutrition, hydration, fueling, and gear strategies

Maintain strength with functional and plyometric work

Taper + Competition

Reduce training load to arrive fresh and sharp

Include short, quality sessions to keep legs primed

Guidance for taper nutrition and race-day fueling

Requirements

A TrainingPeaks-compatible training watch

An external chest strap heart rate monitor (wrist-based HR is not accurate enough for this plan)

👉 With this 24-week intermediate trail plan, you’ll gain the structure, progression, and trail-specific preparation to perform at your best in a 20K trail race—finishing stronger, faster, and more confident.