The Science of Easy Running: Why Slowing Down Makes You Faster

One of the most common questions we get from ultra-runners, be it beginners or seasoned racers, is simple: “How slow should my easy runs be?”And the honest answer is normally, “Probably a bit slower than you think.”

Easy running is the quiet workhorse of endurance training. It doesn’t grab attention on Strava and it might not feel too exciting, but it’s where much of the real progress is made. If you want to improve your aerobic engine, recover well, and handle the long miles required for ultras, getting your easy pace right is essential.

What does “easy” actually mean?

An easy run should feel comfortable from start to finish. You should be able to hold a full conversation, breathe through your nose if you like (although you don’t have to just do that), and finish the run feeling better than when you started.

This kind of running helps:

• Build your aerobic base – Easy running increases mitochondrial density, improves the body’s ability to use oxygen, and enhances fat-oxidation pathways, all essential for long-distance efficiency.
• Strengthen muscles and connective tissues – Low-intensity loads stimulate adaptations in tendons, ligaments, and smaller stabilising muscles without excessive stress, reducing injury risk.
• Improve efficiency and endurance – Steady aerobic running boosts capillary growth around muscle fibres, improving blood flow and helping you maintain pace for longer with less effort.
• Support recovery after harder sessions – Gentle running increases blood circulation, helps remove metabolic by-products, and promotes parasympathetic activity, speeding up recovery processes.

It’s steady, sustainable work, not a test of fitness.

Why runners struggle with slowing down

It’s completely normal to feel unsure about running slowly. Many runners worry they’re not “doing enough” if their watch shows a pace that feels gentle. Others simply drift quicker because it’s habit.

But training isn’t about proving your fitness every day. It’s about creating the right balance so your harder sessions feel sharp and your longer runs feel manageable. When the easy days are genuinely easy, you’re able to get much more out of the whole week.

The ultra paradox: slower training for stronger racing

As distances get longer, the benefits of easy running become even clearer. Ultra-marathons rely heavily on your aerobic system, the engine that lets you keep moving hour after hour. And that system grows best with consistent, comfortable running over time.

If you’re constantly edging into a harder effort on your recovery days, fatigue builds and your body struggles to adapt. But when you keep those days relaxed, everything else starts to click: better long runs, smoother tempo work, fewer niggles, and more energy overall.

Practical ways to keep things easy

Here are some simple tips that help runners of all levels stay in the easy zone:

• Start slowly. Give yourself 10–15 minutes to warm into the run.
• Use effort over pace. Hills, trails, wind, or tired legs can all affect pace. Effort is far more reliable.
• Keep breathing calm. If you can chat or breathe through your nose comfortably, you’re on track.
• Choose softer routes. Grass, parks, and trails naturally encourage an easier effort.
• Run with others. A relaxed group run can make pacing feel effortless, although this can have the opposite effect as well.

When you get it right, everything improves

Most runners notice the change within a few weeks: more consistent training, better recovery, fewer dips in motivation, and a more enjoyable relationship with running. And on race day, it often means you can maintain a stronger, steadier pace for much longer.

Easy running isn’t a step backwards. It’s one of the smartest ways to move forwards.