How to train indoors: turning trainer time into real fitness
The Moveee team
Free coaching · a real route for every ride
The single biggest advantage of indoor training is that nothing interrupts it. No junctions, no traffic lights, no descents where you stop pedalling, no headwind that turns your tempo effort into a threshold effort. That means an indoor hour can contain far more genuine time-in-zone than an outdoor hour — which is exactly why it's so effective, and exactly why it's so easy to waste.
Wasted indoor time looks like this: you clip in, ride at a vague "quite hard" for 50 minutes, get hot, get bored, get off. You've accumulated fatigue but no clear training stimulus. Here's how to make sure that never happens.
The first rule: one job per session
Every indoor session should have exactly one purpose you could state in a sentence. "Today is VO2 max." "Today is sweet spot." "Today is easy." When a session tries to do everything — some hard efforts, some tempo, a bit of sprinting — it ends up doing nothing particularly well, and it costs you the same recovery as a session that did.
Pick the quality, build the session around it, and let everything else be support.
The anatomy of a good indoor hour
10–15 min · 55–65% FTP
Indoors you're cold and stiff — there's no rolling out of the driveway. Include 2–3 short 30-second lifts to open the legs before the real work.
20–40 min · Session-specific
The reason you're here. Everything else exists to protect this block. Keep it focused on one quality — don't mix VO2 and sweet spot in the same hour.
Built in · 45–55% FTP
Actually pedal easy — don't stop. Spinning keeps blood moving and makes the next rep possible. Coming to a halt indoors is the fastest way to a cold, stiff second half.
5–10 min · 45–55% FTP
Five minutes of easy spinning clears the legs and stops the room-spins. Skipping it is how a good session ends with you slumped over the bars.
Notice that the main set is only 20–40 minutes of a 60–75 minute session. That's correct. The quality of those minutes is what makes you faster; the rest is scaffolding.
How much indoor riding is enough?
Two hard indoor sessions a week, done properly, will move almost any amateur's fitness. Three is plenty. More than that and you're usually accumulating fatigue faster than you're absorbing it — especially because indoor riding is so relentless.
A very common and very effective week looks like this:
VO2 max or threshold. 60 min. The hardest thing you do all week.
Sweet spot or over-unders. 60–75 min. Sub-threshold, high-value work.
2–4 hr endurance. Outside if you can; indoors with company or a film if you can't.
45–60 min genuinely easy. Z1–low Z2. Recovery, not secret training.
Three days off the bike entirely. That's not laziness — it's what lets the two hard sessions be genuinely hard. See recovery is training for why this matters more than the sessions themselves.
Six mistakes almost everyone makes
1 Riding every session at 'medium'
Make hard days hard and easy days genuinely easy. The grey zone in between builds fatigue without building fitness.
2 No fan, or a token one
Heat is the limiter indoors, not your legs. Get a proper fan pointed at your chest and face before you buy anything else.
3 Training to your outdoor FTP
Most riders produce less power indoors. Test indoors, or set your indoor targets a little lower.
4 Two-hour sessions to feel virtuous
Indoor time is concentrated. 60 focused minutes beats 120 distracted ones, and you'll still be willing to come back on Thursday.
5 Skipping the cool-down
Five easy minutes. It costs nothing and makes the rest of your evening — and tomorrow — better.
6 Never leaving ERG mode
ERG is superb for steady intervals but it dulls your feel for pace. Ride some sessions in slope mode and pace them yourself.
Make the hour disappear
The last piece is psychological, and it's not a soft one — a session you dread is a session you'll skip. Two things reliably help. First, know exactly what's coming: a session with a visible structure ("4 × 8 minutes, three done, one to go") is far easier than an open-ended "ride hard for an hour." Second, have something to look at that isn't a wall.
That second point is where virtual worlds earn their keep. Moveee Indoor takes a different angle to most: instead of a fictional island, it builds the world from your own routes and real map data, so you can ride the roads of your actual summer loop — or recon next season's target event — while the trainer holds your intervals in ERG mode. It runs in the browser with nothing to install, and it's free while in alpha.
However you fill the screen, the training principles don't change: one job per session, hard days hard, easy days easy, a fan on full, and a plan you can see the end of. Do that twice a week through a winter and you'll be a noticeably different rider by spring. If you'd rather not write the sessions yourself, Moveee builds the whole plan around the days you actually ride — free, and it learns your engine from your own history.
Keep reading
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