Base miles aren't dead: how to build an aerobic engine over winter

Base training will never trend. There's no PR to post, no leaderboard to top, no video of you gasping over the bars — just hours of steady, unremarkable riding at a pace you could hold while chatting. And yet it is the single most important block of your year. Base is the foundation everything else is built on: the threshold intervals, the VO2max efforts, the race-day sharpness all sit on top of the aerobic engine you build in the quiet months. Skip it, and the fancy work upstairs has nothing to stand on.

What base training actually builds

"Just ride easy" undersells what's happening. Low-intensity aerobic volume drives a specific set of adaptations — slow to arrive, deep-rooted, and hard to build any other way. Here's what those winter hours are actually growing:

These adaptations are largely driven by time in zone, not intensity. That's why base is about accumulated easy hours, not heroic single efforts.

How much base do you need?

There's no universal number — it scales with your experience, your available hours and how big a season you're building toward. The rough guide below is approximate; treat the ranges as starting points, not prescriptions. The through-line: the more ambitious the goal, the longer and deeper the base beneath it.

Short on time? A shorter base done consistently beats a long one you keep abandoning. Hours matter, but weeks-in-a-row matter more.

Base, Build, Peak — the order that works

Classic periodisation stacks your season in three phases, each resting on the one before. The proportions are the point: base is by far the biggest block, because it's the widest part of the pyramid. Build sharpens what base created; peak simply polishes it for race day.

Proportions are illustrative and vary with your event and calendar — but base is always the widest block. You can't peak on a foundation you never poured.

Zone 2, done right

Here's the catch that trips up almost everyone: base miles only work if they're genuinely easy — and most riders ride them far too hard. Zone 2 is conversational. Roughly below 75% of your FTP, an effort where you could hold a full sentence without gasping, where your breathing is steady and your heart rate settles into a comfortable rhythm. If you're grinding out a "comfy-hard" tempo, you've drifted into the grey zone — too hard to recover from, too easy to drive top-end gains.

The simplest gauge is the talk test: if you can chat in complete sentences, you're in the right place; if you're clipping words to catch your breath, ease off. It will feel almost embarrassingly gentle, especially riding with others. That's the point. The discipline of easy is the whole skill of base training.

If your endurance rides keep creeping toward the amber, you're leaking recovery. Cap the power, ride the extra ten minutes instead.

Making winter miles count

Base doesn't require a training camp in the sun. It rewards routine, and routine is exactly what winter can offer if you plan for it. A few principles keep the hours honest:

• Indoor Z2 is time well spent. A trainer turns a dark, icy evening into a controlled, distraction-free hour of endurance. No traffic, no coasting, no stop lights bleeding your time in zone.
• Endurance group rides work — if the group actually rides easy. The right bunch makes long steady hours fly by. The wrong one turns every hill into a race and quietly wrecks the purpose.
• Consistency beats the single epic. Four steady weeks of five honest hours will build more engine than one heroic 200 km day followed by a week too wrecked to ride.

Note the shape: almost all Z2, one long ride, real rest days, and only the lightest touch of tempo. Nothing here should leave you cooked.

Base-training myths, retired

Base has picked up a reputation as slow, boring and slightly pointless — mostly from people doing it wrong. Three myths worth putting to bed:

• "It's just junk miles." Junk miles are aimless, grey-zone efforts that fatigue you without a target. Purposeful Z2 is the opposite: a specific stimulus for a specific, well-understood adaptation. There's nothing junk about growing mitochondria.
• "Base means always going long." Volume helps, but a base ride can be 60 focused indoor minutes. What defines base is the intensity — easy and aerobic — not the duration. Consistency across the week matters more than any single ride's length.
• "You lose it the moment you stop." Aerobic adaptations are among the slowest to fade. Mitochondrial density and capillarisation hang around for weeks; a missed ride or an off week won't undo a winter's work. Base is a durable investment, not a leaky bucket.

Let Moveee build your base for you

The hardest part of base training isn't the riding — it's the discipline of keeping easy days genuinely easy, week after quiet week. That's exactly where Moveee helps. It reads your engine from your ride history, schedules your base block with the right proportion of endurance to intensity, and holds your easy days to a real Z2 target so you stop leaking recovery into the grey zone. Every session comes with a terrain-matched route to ride it on, so those winter hours have somewhere to go. Have a look at your fitness and form to see where your aerobic base stands today — then let Moveee lay the foundation for the season you're actually chasing.