If you've been training consistently, you've probably started to care about things like "what surface should I run on?" and “how many pairs of shoes is too many?” Good. That means you’re paying attention. Because when you’re logging 30, 40, even 50 miles a week, the road under your feet and the rubber on your shoes start to matter more than you think.
Let’s break it down.
Surfaces: Choose Your Ground Wisely
Not all miles are created equal. A mile on the road and a mile on a trail might look the same on Strava, but your legs will tell a different story.
Roads are your go-to for speed work and long runs. Why? Because that’s what you’re racing on. Asphalt and concrete are unforgiving, yes, but they’re predictable. You can lock into your pace, get into a rhythm, and simulate race conditions. The downside? The impact forces are higher. Studies show that hard surfaces generate more ground reaction force, which over time can contribute to injury if you're not careful.
Trails, on the other hand, are your recovery day heroes. The surface is softer, reducing the load on your joints. Plus, the uneven terrain activates stabilizing muscles, which helps strengthen your ankles, hips, and feet. Think of it as strength training disguised as peaceful running. But don’t bring your track workout to the forest, trails are better for easy, soul-filling miles, not splits and segments.
Treadmills? Not my favorite. But I won’t pretend they don’t have their place. They’re safer than running in snowstorms, lightning, and soul-crushing winds (although I have some running buddies who are “never treadmillers” that forced me into running in these conditions - not recommended, I am still traumatized). Treadmills also give you total control over incline and pace, which can be useful for tempo runs when the roads are unsafe. Just know this: anything over an hour on the treadmill can feel like a psychological experiment. Use them sparingly. Save them for emergencies. And avoid scrolling TikTok while you’re on them, you’ve been warned.
Sneakers: Weaponize Your Feet
Let’s talk footwear, or more specifically, carbon-plated running shoes. The not-so-secret weapon in every elite (and increasingly non-elite) marathoner’s closet.
Here’s the science: Carbon shoes are designed to improve running economy by reducing the amount of energy you use at a given pace. A 2017 study out of the University of Colorado found that Nike’s Vaporfly (the pioneer carbon shoe) improved running economy by about 4%. That’s like taking 4% off your gas bill, every single mile.
They do this with a combination of ultra-responsive foam and a rigid carbon plate that creates a spring-like effect. This “lever” propels you forward, especially at faster speeds. In short, they help you run faster for longer, but they’re not magic slippers. You still have to do the work.
Here’s the reality: They’re expensive. They don’t last long. And they’re not for every run.
The strategy:
Preserve one pair for race day. Max 30 miles of use before race day, enough to break them in but not wear them down.
Get a second pair if budget allows. Use these for long tempos or fast workouts only.
Daily runs? Stick to a comfortable, cheaper trainer. You don’t need carbon to shuffle through an easy 5 miles.
Overusing carbon shoes for every run can also diminish their effectiveness and increase your risk of injury. That rigid plate is built for efficiency, not for recovery runs on tired legs. Think of them like a sports car: great for the highway, not ideal for pothole-ridden back roads or Monday morning coffee runs.
Final Word
Surfaces and shoes are like tools. Use the right one for the job. Save the treadmill for storms, the carbon plates for speed, and your trail shoes for when your brain, and knees, need a break.
You don’t need to be obsessive. But you do need to be smart. After all, we’re not just trying to finish the marathon. We’re trying to finish strong.