Trail Notes | Training Plans & First Ultra

Why the quiet miles build the engine your ultra depends on

Easy Runs

Are the Foundation

If you have ever looked at an ultra training plan and wondered why so much of it feels almost too easy, this is the explanation.

Most runners believe progress is proportional to effort. The harder the session, the more you gain. It is a logical assumption, but in ultra training it can lead to one of the most common mistakes: running too hard on the days that are meant to build your base.

Easy runs are not filler between the important sessions. They are the foundation the important sessions sit on. They build the aerobic engine, support recovery, make consistency possible and teach the restraint that race day will demand.

Trail Note  ·  01

An ultra is mostly aerobic

The longer the event, the more your aerobic system dominates. A trail ultra asks you to move for hours, manage climbs, descend on tired legs, fuel while moving, regulate effort and keep making decisions long after the start-line adrenaline has gone.

Short surges matter. Steep climbs, technical terrain and late-race efforts all ask for strength and intensity. But the system that carries the whole day is your aerobic engine.

That is why so much of a well-built plan lives at an effort you can sustain. Easy running lets you accumulate time on feet without creating a recovery cost so high that the rest of the week falls apart.

Trail Note  ·  02

What easy running actually builds

Genuinely easy running creates adaptations that matter deeply for trail and ultra performance. These changes are not always dramatic on the day. They compound quietly across weeks and months.

Hard sessions matter, but they work best when they are supported by an easy base. Without that base, intensity becomes expensive. With it, intensity has somewhere to land.

Trail Note  ·  03

Why easy can feel too slow

Easy running can feel almost suspiciously slow. You may wonder whether it is doing anything. You may feel uncomfortable being overtaken, especially in a group. You may start nudging the pace because the watch, the trail or your ego tells you the run should look more impressive.

But easy is not meant to feel exciting. It is meant to be repeatable. That repeatability is what lets aerobic adaptation accumulate.

Trail Note  ·  04

The cost of drifting too hard

The most expensive mistake in ultra training is often not the hard session. It is the easy run that quietly becomes moderate.

That middle effort can feel productive because you are working. But it is not easy enough to recover from quickly, and not hard enough to replace a deliberate quality session. You pay more in fatigue without getting the clear purpose of either end of the training spectrum.

Over time, this can blunt both sides of the plan. Easy runs stop being truly easy, and hard days become less effective because you arrive carrying fatigue from the days that were meant to support them.

Trail Note  ·  05

The female physiology lens

Most endurance training advice was not originally built around female athletes. That does not mean the principles are useless. It means women deserve a more specific lens when applying them.

Research suggests women may rely proportionally more on fat as a fuel source during moderate-intensity endurance exercise than men at similar relative intensities. This does not mean women do not need carbohydrate. They absolutely do, especially around harder or longer sessions. But it does support why sustained aerobic work can be such a powerful tool in a female endurance training plan.

Protecting easy effort also matters because female athletes can be vulnerable to the combined load of training stress, insufficient fuelling, poor recovery, menstrual disruption, bone stress and broader life load. Easy days that drift too hard can become one more stressor in a system that is already working hard.

Trail Note  ·  06

The cycle, the plan and the effort

Your menstrual cycle, hormonal contraception, perimenopause, sleep, heat and stress can all influence how easy running feels. That does not mean the plan is wrong. It means pace is not the only measure of whether you are in the right place.

In the premenstrual window, some women notice higher perceived effort, higher heart rate, altered heat tolerance, sleep disruption, appetite changes or heavier legs. Others notice very little. The useful move is not to force a textbook rule. It is to run the effort that matches the purpose of the session.

Trail Note  ·  07

What easy actually feels like

Easy running should feel controlled, conversational and repeatable. You are working, but you are not proving anything. You should finish feeling like you could have done more.

For trail runners, easy pace will shift constantly. Gradient, surface, temperature and fatigue all matter. The aim is not to make every kilometre look the same. The aim is to keep the internal effort where it belongs.

Trail Note  ·  08

The training week is the race, in miniature

Ultras reward restraint. The runner who goes out too hard often spends the second half paying for the first. The same principle applies to training.

If you spend too much early in the week, the later sessions suffer. If you turn every easy run into a moderate run, your body never gets the full benefit of either recovery or quality. The week starts to look like a poorly paced race.

Protecting easy runs teaches exactly what race day asks for: patience, rhythm, discipline and trust in the long game.

What to take away

Reflection prompt

Slow down to build something stronger

Keep going with us

General education only. This article is not individual coaching, medical or exercise prescription advice. Adjust your training intensity, volume and recovery to your current fitness, health, symptoms, injury history and life load.