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# How do I choose the right hill for my trail race preparation?

**We recommend choosing the hill or climb where the effort is as long as possible**—so the *longest hill* you have access to. This gives you the most flexibility for your training. At Campus, we generally say that hill work should be done on slopes with a gradient between **4% and 8%**, but ideally, you should train on inclines that are as close as possible to what you’ll face on race day.

# The key is to avoid extremes—both overly steep hills and very gentle inclines, as neither are ideal for your preparation.

| For example, a hill with too steep a gradient—like a mountain road or staircase—can average a **30% incline**, which is extremely demanding. | On the flip side, a very gentle uphill slope (a slight incline) won’t challenge you enough to be useful in your training.