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# In the shock blocks, should we stick to the session duration or the elevation gain?

**During training sessions, the most important factor is the effort time—the time spent walking or running.**

That means you should prioritize the **duration** of your session if you’re unable to match the exact recommended elevation gain for your outing. The key is to work on inclines that are similar in percentage to what you'll encounter on race day.

Don’t forget: during these sessions, it’s **essential** to monitor your **hydration** and **nutrition**. If you have any questions about this, feel free to check out the community to find advice and testimonials from other Campus runners—or ask Mélanie, our nutrition expert.