The autumn-winter period represents the ideal time to train or improve your slow bottom, a fundamental quality for every biker who wants to face a solid and high-performance MTB season.
For those who already have a good aerobic base and have several seasons behind them, this phase can be considered a moment of transition: the physical and mental intensity of training is reduced while maintaining excellent overall efficiency.
The goal is consolidate physiological adaptations, keeping mitochondria active at the cellular level and preserving the functionality of the cardiovascular system and muscle vascularization.
For those who are in the growth phase, or have encountered a drop in stamina during races, slow running becomes an essential tool for improving basic resistance, an indispensable quality for sustaining more demanding workloads in the following months and for tackling competitions with greater consistency.
What do you train with slow running?
Slow running, although often perceived as an "easy" workout, hides extraordinary benefits. It is precisely through these low-intensity outings that the true basis of performance.
1️⃣ Increased mitochondria
Resistance training increases the number of mitochondria inside muscle cells.
But what are mitochondria?
They are the real ones power plants of our organism: they allow us to produce energy using mainly aerobic metabolic sources (fats and oxygen).
More mitochondria mean a greater ability to generate power while maintaining prolonged efforts, an essential feature in aerobic disciplines such as mountain bike.
2️⃣ Improved capillarization
The slow bottom stimulates the increase of the capillary network which brings blood to the muscles.
Better circulated muscles receive:
- More oxygen
- More nutrients
- Faster disposal of CO₂ and lactic acid
This improvement in microcirculation allows for a greater resistance to stress and better recovery capacity even during high intensity phases.
3️⃣ Transformation of muscle fibers
Our muscles are made up of:
- White fibers (fast and powerful)
- Red fibers (slow and resistant)
- Intermediate fibers
Intermediate fibers possess both qualities, but it is training that determines their specialization.
Slow core work promotes a transformation towards a more resistant behavior, making the muscle more efficient in prolonged efforts.
4️⃣ Mental training
An aspect that is often underestimated is that mental.
Long, low-intensity rides train:
- The ability to concentrate
- Pace management
- Tolerance to monotony
- The habit of spending many hours in the saddle
These qualities are essential not only in competition - especially in MTB granfondo — but also to face weeks of intense training and maintain consistency throughout the entire season.
Slow MTB Cross-Country Training Examples
Work area: Low and constant intensity – Zone 2 (60–75% HRmax)
Sensations: controlled breathing, conversation possible, no shortness of breath
| Biker level | Release duration | Intensity | Recommended soil | Training goal |
| Beginner | 1h30' – 2h | FC Z2 low | Dirt roads, easy dirt roads, flat asphalt | Build the first aerobic base and accustom the body to the continuity of the effort |
| Intermediate | 2h - 3h | FC Z2 average | Mixed dirt roads, easy MTB with short climbs | Increased basic resistance and muscle capillarization |
| Advanced | 3h - 4h | FC Z2 stable | Hilly MTB trails with long, steady climbs | Mitochondrial stimulation and prolonged aerobic endurance |
| Elite / Competitor | 4h - 5h | FC Z2 controlled | Trail and continuous climbs at a constant pace | Maximizing aerobic volume and mitochondrial adaptations |
| Active recovery | 60' – 90' | FC Z1 – Z2 low | Asphalt or very easy dirt road | Relieving fatigue and maintaining the base |
📌 Practical tips for running slow runs
- ✅ Keep steady pace: avoid jerks or sudden changes in intensity.
- ✅ Agile Reports Uphill: Your cadence should remain smooth (80–95 rpm).
- ✅ Regular hydration: Sip every 15–20 minutes.
- ✅ Light diet: after 90 minutes introduce simple carbohydrates (30–40 g/hour).
- ✅ No sprint: the goal is to train endurance, not power.
🎯 How much slow skiing should I do in winter?
Indicatively:
- 2–3 releases per week for beginners and amateurs
- 3–4 releases per week for more advanced bikers
- 60–70% of total volume in the winter phase it can be dedicated to slow bottom fishing
Conclusion
Slow bottom is not simply “going slow”: it is the heart of cycling preparation.
It builds the physical and mental foundation upon which all subsequent more intense work will rest.
Neglecting it means severely limiting the margins for improvement, while training it consistently allows you to face the season with greater solidity, resistance and consistency of performance.
