Easy Wins: The Endurance Fueling Playbook for Marathon & Long-Distance Training

This playbook is for runners and endurance athletes who can already cover the distance but suspect they're leaving time and comfort on the table. Maybe you've been told you don't need much fuel. Maybe you've heard "never fuel" treated like a badge of honour. Or maybe you just aren't sure how many carbs to eat, when to take caffeine, or why your gut falls apart at kilometre 30. Here's the starting point: finishing a marathon without fuelling isn't proof that fuelling is unnecessary. It means you skipped some easy wins. The research gives us realistic ranges: carb loading around 2 to 3% performance improvement, caffeine 1 to 2%, concentrated beetroot juice 1 to 3%, and carbs during the race 0.5 to 3%. None of these decide whether you can finish. All of them can make you faster or make the day feel better. Inside you'll find eight plays. Each tells you when to use it, gives you step-by-step instructions, and walks through a worked example. You'll learn how to fuel for the session coming up rather than the one you just finished, how to train your gut gradually, how to periodise carbs alongside your training, how to dose and time caffeine without wrecking sleep, and how to build a race-day plan you've already rehearsed. You'll also learn when the problem isn't nutrition at all. It's written by Aidan Muir, an Accredited Practicing Dietitian who works with health and performance clients in person and online. He also runs DEXA and RMR testing, so his advice rests on measured data and research, not on hype or tradition.