Specific Development Phase: Step Into Your Race (4/5)

This is where everything comes together. After building your base of endurance and strength, the specific development phase immerses you in the real conditions of your target trail race. Every session becomes a test, every outing a simulation. You’re no longer just training your body — you’re programming your race.

Understanding the specific phase

The goal is simple: reproduce in training the exact demands of your race. Elevation, terrain, duration, weather, fatigue, nutrition — everything must be tested, tweaked, and validated.

For a 30 to 60 km trail race, this phase typically lasts 4 to 6 weeks. For an ultra, 6 to 9 weeks. Volume increases, sessions get longer, workouts become more targeted.

Key training focus areas

Hilly long runs become essential, on terrain similar to your target race: 2.5 to 3 hours for mid-distance trails, up to 5 hours for ultras. This is where you test fueling, hydration, gear, and poles.

Hill sessions split into two categories: short explosive hills (30 seconds to 1.5 minutes) for power and climbing technique, and long hills (3 to 8 minutes) for muscular endurance. Add climb-descent combinations with no rest to mimic the muscular stress of technical terrain.

Threshold and VMA workouts maintain speed and your ability to hold a strong pace. They aren’t the focus, but they keep you sharp.

Downhill work becomes a cornerstone: your quads must absorb impact, stabilise your body, and react to terrain. This skill is earned through practice.

Strength training and proprioception

One to two strength sessions per week, focused on lower body and posterior chain: squats, lunges, step-ups, planks, wall sits, unilateral work. This isn’t the time to build, it’s time to consolidate. Keep balance drills, band exercises, and stability postures — those details make the difference at kilometre 50.

Managing intensity and load

On average: 70% of training at low intensity, 20% at moderate intensity (threshold, race pace), 10% at high intensity (explosive hills, VMA). Space out hard workouts with easy runs or active recovery.

Sample week — 30 to 60 km trail race

  • Monday: 1-hour easy trail run
  • Tuesday: short hill session — 2 sets of 8 × 1-minute climbs, downhill recovery
  • Wednesday: active rest or cross-training (bike, swim, ski, yoga)
  • Thursday: threshold session — 3 × 10 minutes at tempo pace, 3-minute recovery
  • Friday: 30-minute strength training + 40-minute easy run
  • Saturday: long hilly run (2.5 to 3 hours) with power hiking and nutrition practice
  • Sunday: downhill technique session on steep slopes, focusing on control and reacceleration

Around 8 to 10 hours total, adjusted to your level.

Sample week — ultra (60 to 100+ km)

  • Monday: full rest or mobility session
  • Tuesday: 6 × 5-minute uphill intervals at 85% max HR, downhill recovery
  • Wednesday: easy trail run or hike (1.5 hours)
  • Thursday: strength or deep core training
  • Friday: 1 h 15 run with 40 minutes at marathon pace
  • Saturday: long run (4 to 5 hours) on race-like terrain with poles
  • Sunday: second long run (2 to 3 hours) — a shock weekend to build mental and muscular resilience

Weekly volume can hit 12 to 15 hours, with reduced assimilation weeks every third week.

Tailoring the phase to your profile

Beginners: 5 to 7 hours a week is enough — one long run, one hill session, one threshold session and light strength work. Intermediates: increase volume slightly and add a shock weekend. Advanced athletes: double sessions, night runs, mountain or altitude blocks, simulating race-day conditions exactly. But without recovery it all collapses — assimilation weeks are as critical as training load.

In summary

The specific phase transforms your endurance base into race-day performance. Run on your race terrain, eat what you’ll eat on race day, wear your gear, simulate your fatigue. Plan your peak load 3 to 4 weeks before race day, then start tapering. This is where you become truly ready — physically, mentally, and strategically.

This article is part of the series “Build your trail season”: 1/5 Planning your season · 2/5 The base phase · 3/5 General development · 4/5 Specific development · 5/5 Tapering