Hilly vs Flat Marathon Training – The Mistake Most Runners Make

February 27, 2025 | By

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Training on hills won’t always prepare you for a flat race—here’s what you need to know.

The Problem With Flat

Hills are loud. They demand attention. Your body shifts, your breathing changes, your effort fluctuates. But a flat course? A flat course whispers. It asks for patience and it lulls you into a steady rhythm, then slowly, methodically, wears you down. No breaks, no moments of relief. Just the same muscles, same cadence, same impact, over and over until suddenly—bam—fatigue sneaks in like a thief. And that’s why runners who only train on hills can struggle when race day is pancake-flat. This is because their body is primed for variability, not monotony.

How to Train Differently

You need to embrace the grind. Find the flattest stretch of road (even if it’s a boring loop) and practice your marathon pace for miles at a time. If you don’t have flat roads? Simulate it. Treadmill at 0% incline. Longer intervals at steady effort. Tempo runs on the track? (Ugh… but if you want that best time, you gotta do what you gotta do)

And don’t neglect the small things: strength training for muscle endurance, mental strategies to fight the monotony, even shoe rotation to manage repetitive stress. The goal isn’t just fitness—it’s adaptation. Make flat feel normal again (get it?!)

Why It Matters

Because what seems easier can sometimes be harder. Flat marathons don’t give you an excuse to slow down, no downhill sections to reset. It’s a different kind of toughness—one that’s built in training, in the small choices, in the willingness to prepare for something that doesn’t seem threatening… until it is. So next time you plan your long run, ask yourself: am I training for my race, or just for the runs I enjoy?

Watch above and listen below to the full episode on your next run or workout.

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