Why Most of Your Training Should Be Easier Than You Think

If I had to fix one thing about how most amateurs train, it'd be this: they ride their easy days too hard and their hard days too easy. The backbone of good endurance training is controlled aerobic work, done at an honest, repeatable intensity, most of the time. Intensity is the seasoning, not the meal.

Why is everyone stuck in the grey zone?

Because it feels productive. A steady effort that leaves you a bit cooked feels like work, so people default to it every session. The problem is that this middle ground, hard enough to pile up fatigue but not hard enough to force a proper adaptation, gives you the cost of hard training without the reward of it. You're tired all the time and improving slowly. I've coached plenty of people who were training their socks off in exactly this zone and getting nowhere, and the fix was to make them go easier, which they hated for about three weeks and then loved.

Easy should be genuinely easy. Conversational, low heart rate, the sort of ride where you finish and think you barely did anything. That's the point. It builds the aerobic engine, the mitochondria, the fat metabolism, the capillary bed, without digging a hole. And when the hard day comes around, you're fresh enough to actually go hard.

The physiology behind this isn't mysterious. Low-intensity aerobic work drives the adaptations that make you an endurance athlete: more and bigger mitochondria to produce energy aerobically, better fat oxidation so you spare your limited carbohydrate stores, and a denser capillary bed to deliver oxygen and clear waste. Crucially, these adaptations respond to volume, to time accumulated, and volume is only possible if the intensity is low enough that you can recover and come back and do it again tomorrow. Push the easy days into the grey zone and you can't accumulate the volume, because you're too tired, so you lose the exact adaptation the easy days exist to produce. You get less base off more suffering. That's the trap.

What does the backbone look like?

Most of the volume should be sub-threshold: aerobic and controlled, below the point where it starts to hurt in a way you have to fight. How I structure the year around that depends on how far out the race is.

• More than twelve weeks to the race: the emphasis is sub-threshold progressive overload. You build time-in-zone at tempo, sweet-spot and sub-threshold week on week, growing the durable aerobic base that everything else sits on. Patient, unglamorous, and the highest-return work there is at this range.
• Twelve weeks or less: the plan tips polarised, broadly seventy to eighty per cent easy and twenty to thirty per cent genuinely hard, with a growing sprinkle of race-intensity work as race day approaches. The hard days get sharper and more specific; the easy days stay honestly easy to pay for them.

The through-line in both is the same. The bulk of your training is aerobic and controlled. What changes near the race is how the small hard slice gets spent.

Why sub-threshold rather than just easy and hard?

Because there's enormous value in the controlled work that sits just below your threshold, and it gets unfairly lumped in with the useless grey zone. There's a difference between drifting into no-man's-land on an easy day, which is a mistake, and deliberately doing a tempo, sweet-spot or sub-threshold session with a clear target and a clear purpose, which is not. The first is uncontrolled and leaves you tired for no gain. The second is one of the highest-return sessions in endurance training, especially when the race is a long way off.

The reason it works is durability. Long-course racing isn't won by your one-minute power or even really by your threshold; it's won by how much of your ability you can still access after four, six, eight hours of work. Progressive sub-threshold volume, built patiently, is what raises that durable ceiling. It teaches the body to hold a strong aerobic effort for a long time without falling apart. Done properly, week on week, with the time-in-zone climbing gradually, it's the quiet backbone that everything specific gets bolted onto later.

The trick is that it still has to be controlled. Sub-threshold means below threshold, on purpose, at a target, not "as hard as I can hold." The moment it creeps up into threshold and beyond on every session, you're back in the grey zone with extra steps.

When does intensity actually earn its place?

Intensity is a tool, and like any tool it's for a specific job. It earns its place when:

• You're inside the sharpening window and need to lift the top end for a specific event demand.
• You've got a limiter that only high-intensity work moves, like a weak VO2 ceiling for a punchy course.
• The session is properly dosed. A VO2 block with only a few minutes of actual work in it is a waste of a hard day. The sessions that build fitness carry real accumulated time at the target, with recoveries long enough to let you hit the next rep. Half-hearted intensity is the worst of both worlds.

One more thing people miss: heat work is intense work. A heat-acclimation turbo session might read as soft wattage, but physiologically it lands in the hard budget. If you're running a heat block, your conventional intensity has to shrink to make room, or it's all hard, all the time, and you crack. Easy stays easy so the hard, in whatever form, can be hard.

So how do I know if I'm doing it right?

Ask two honest questions after each session. On an easy day: could I have held a conversation the whole time and finished feeling I could do it again tomorrow? If not, it wasn't easy. On a hard day: did I actually reach the intensity the session was built for, or did I fade into the grey zone halfway through? If you can't give the right answer to both, you're training in the middle, and the middle is where progress goes to stall.

Get the easy days easy and the hard days hard. The aerobic backbone does the quiet, enormous work; intensity, used sparingly and dosed properly, puts the edge on top. That order matters, and most people have it backwards.

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