LR-016Z1RecoveryLong RunRunning

Ultra Time-on-Feet (Run-Hike)

3-5 hours of continuous movement in strict Zone 1, alternating 20-30 minutes of easy running and 10-15 minutes of active walking (power hike). Integrated nutrition practice every 30-45 minutes. Develops ultra-endurance specific adaptations.

Duration: 3h50
Level: Intermediate
Target: Aerobic Base
Elevation: +750 m

Session structure

3h50 · 3 phases

0 min · start3h50 · end

Intensity scaleZ1Recovery

Warm-up

10min

Z1RecoveryProgressive walk 10min

10min

Main Set

3h30

Z1Recovery3-5h in strict Z1 (< 70% HRmax). Alternating: 20-30min easy run / 10-15min active walk (power hike, arms engaged). Fueling every 30-45min (gels, bars, water + electrolytes). On trails if possible

3h30

Cool-down

10min

Z1RecoveryRecovery walk and gentle stretches

10min

Zone Distribution

Z1Recovery3h50

Total 3h50

Tips

The goal is time on feet, NOT distance or pace
Active walking (power hike) is an ultra racing skill, train it seriously
Test your race nutrition strategy: find what your stomach tolerates over time
Stay strictly in Z1, any drift into Z2 over this duration causes disproportionate fatigue

Common Mistakes

Running in Z2 instead of Z1, which makes the session too demanding over 3-5 hours
Not practicing race nutrition (waiting for competition to test)
Considering walking phases as failure instead of an ultra strategy

Trail profile

Technical trail · 22 m/km · avg grade 5.5%

Nutrition & Recovery

Nutrition

Eat your last meal at least 3 hours before the session for optimal digestion.
Carb-rich meal the night before (pasta, rice, sweet potatoes).

Hydration

Drink 400 to 500 ml of water in the 2 hours before the session.
Top up with 200 ml in the 15 to 30 minutes before heading out.
Avoid diuretic beverages (excessive coffee, alcohol) in the hours before.

Why it works

Why this format

Foundational endurance training stimulates mitochondrial biogenesis and capillary network development around type I muscle fibers. By maintaining a low intensity (below the first ventilatory threshold), the body optimizes fatty acid oxidation as an energy substrate, sparing muscle and hepatic glycogen for higher-intensity efforts.

Zones solicited

Recovery

Z1 promotes active recovery and increases blood flow to muscles without generating significant fatigue, allowing for high training volume.

Expected adaptations

Increased mitochondrial density in type I fibers (+40-60% after 6-8 weeks)
Development of peri-muscular capillary network (angiogenesis)
Improved oxidative enzyme activity (citrate synthase, succinate dehydrogenase)
Increased fatty acid oxidation capacity (intramuscular lipolysis)
Enhanced resting and exercise stroke volume

2 studies

Seiler S (2010) View study →What is best practice for training intensity and duration distribution in endurance athletes?
San-Millán I, Brooks GA (2018) View study →Assessment of metabolic flexibility by means of measuring blood lactate, fat, and carbohydrate oxidation responses to exercise in professional endurance athletes and less-fit individuals