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# Muscle pre-fatigue

**Who is the muscle pre-fatigue feature for?**

This feature was designed for trail runners living in flat regions. Campus wanted to provide a solution, and coach Mathieu Blanchard has created a specific training plan to help you prepare properly—no matter your environment.

Muscle pre-fatigue is integrated into trail training plans (if you activate the option) for users who indicate they have either no hills nearby or only short hills under 2 minutes.

The option will appear in **> hill settings** if you select that there are no nearby hills or your hill is shorter than 2 minutes

**What is the goal of muscle pre-fatigue?**

The idea is to simulate the fatigue caused by elevation gain by adding strength exercises *before* hill intervals in your quality sessions.

**Which sessions are eligible?**

All quality sessions in trail plans are affected, **except**:

* Sessions in the recovery phase
* Tapering sessions
* Sessions with hill intervals shorter than 2 minutes (e.g., sprints)
* Users with more than 2-minute hills in their settings

🔎 If you already have access to real hill terrain (longer than 2 minutes), you won’t see this feature—because the most effective plan is the one that matches your real environment.

**To sum up:**

* This feature is for runners without hills or with hills under 2 minutes near them
* Strength exercises are added *before* hill intervals in your quality workouts
* They help create muscle fatigue to better simulate trail conditions
* It improves your muscular resistance to fatigue
* You can disable this option anytime in your settings