Episode 22 - The Minimum Intensity for the Right Adaptation. No More.

In this episode, we explore one of the most important principles for sustainable ultrarunning progress: using the minimum intensity needed to create the right adaptation.

The goal of training is not to suffer as much as possible. The goal is to apply the right stimulus, recover from it, and repeat it consistently over time. Whether we are doing intervals, hill work, downhill sessions, strength training, or long runs, the same principle applies: enough stress to adapt, but not so much that it disrupts the rest of the training block.

The episode compares training intensity with a doctor prescribing medication. The best dose is not the highest dose; it is the dose that works with the fewest side effects. In running, too much intensity can create unnecessary fatigue, soreness, injury risk, and poor recovery. Too little does not create adaptation. The sweet spot is the smallest useful dose.

For ultrarunners, this means progressing gradually, respecting recovery, and judging sessions not only by how hard they feel, but by whether they allow consistent training afterwards.

Key message: Train hard enough to adapt, but not so hard that the cost is greater than the benefit.

Key references:

1. Androulakis-Korakakis et al. — The Minimum Effective Training Dose Required to Increase 1RM Strength in Resistance-Trained Men

2. Schoenfeld et al. — Resistance Training Volume Enhances Muscle Hypertrophy but Not Strength in Trained Men

3. Hughes et al. — Adaptations to Endurance and Strength Training

4. Spiering et al. — Maintaining Physical Performance: The Minimal Dose of Exercise Needed to Preserve Endurance and Strength Over Time

5. Rosenblat et al. — Polarized vs Threshold Training: Systematic Review and Meta-analysis

6. Muñoz et al. — Does Polarized Training Improve Performance in Recreational Runners?

7. Oliveira et al. — Comparison of Polarized Versus Other Types of Endurance Training Intensity Distribution

8. Tallis et al. — Repeated Bout Effect of Downhill Running on Physiological Markers and Muscle Soreness

9. Assumpção et al. — A Single Bout of Downhill Running Attenuates Subsequent Exercise-Induced Muscle Damage

10. Martinez-Navarro et al. — Downhill Running-Induced Muscle Damage in Trail Runners