Ultra Running Guide for Everyone

By a regular runner, for regular runners.

Fueling 101

Eat early. Eat often. Practice on long runs.

Updated September 8, 2026

Fueling Is a Skill, Not a Talent

Most first-ultra problems are stomach and energy problems, not “not tough enough.” You can train your gut the same way you train your legs — on the long runs you are already doing for the 16-week plan.

Simple targets (first 50K)

Busy-parent hack: Pre-bag long-run fuel the night before (or Sunday meal-prep style). Decision fatigue at mile 18 is real; labels and a phone timer help.

What to carry

More on kits: Gear.

Practice protocol (steal this)

  1. On long runs ≥90 minutes, eat on a timer (every 30–40 minutes).
  2. Write down what worked (brand, flavor, amount, weather).
  3. If your stomach rebels, reduce intensity first, then adjust amount/type next week — do not panic-quit fueling entirely.
  4. Do one full dress rehearsal 2–3 weeks out with race vest + race fuel.

Aid stations

Use them, but do not depend on mystery food you have never tried. Grab what looks familiar; keep moving. For a first 50K, brief stops beat long picnics.

FAQ

Gels only, or real food?

Either can work. Many people mix both. The winner is whatever you can keep down for hours.

What about caffeine?

Useful late, risky if you do not use it in training. Never surprise your gut on race day.

I hate eating while running.

Start tiny and early. Chews, diluted drink mix, or soft foods go down easier than a huge gel chug at mile 20.