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Indoor riding has a reputation for being the easy option nutritionally — you're at home, the fridge is right there, and you're never more than a minute from a tap. In practice riders get it wrong constantly in both directions: enormous meals before an easy 45-minute spin, or a two-hour trainer session on nothing but half a bottle of water.
The physiology isn't different indoors. The conditions are, in four specific ways that change the numbers.
Why indoors is a different fuelling problem
You sweat far more
Without a 30 km/h breeze, sweat rates indoors are dramatically higher. Two bottles an hour is normal on a hard session, not excessive.
You burn more per minute
No coasting, no junctions, no freewheeling downhill. An indoor hour contains far more actual pedalling than an outdoor one — so it demands more fuel.
Sodium losses are bigger
More sweat means more sodium out. Plain water alone on a long indoor session leaves you flat and sometimes headachy.
Refuelling is trivially easy
The one advantage: your kitchen is ten steps away. No need to carry three hours of food in your pockets.
What to eat before
Time is the main variable:
- 2–3 hours before: a normal balanced meal with a decent carbohydrate portion. Nothing exotic.
- 1 hour before: something small and mostly carbohydrate — a banana, a slice of toast with honey, a rice cake. Keep fat and fibre low.
- Under 30 minutes: nothing solid, or a few sips of a carbohydrate drink. Riding hard on a full stomach is unpleasant and pointless.
- Early morning session? A short easy ride is fine fasted. A hard interval session almost never is — have something, even if it's just a drink with carbohydrate in it.
What to take during
Match intake to duration and intensity. These are guidance ranges, not prescriptions — individual tolerance varies a lot, and high intakes require a gut you've trained gradually.
| Session | Carbohydrate | Fluid | Notes |
|---|---|---|---|
| Under 45 min | None needed | Water | You have plenty of stored glycogen. Eating here is a habit, not a requirement. |
| 45–75 min, easy | None needed | Water | A genuine Z2 hour runs comfortably on what's already in the tank. |
| 60–90 min, hard | 30–60 g/hr | Water + electrolytes | Intervals burn carbohydrate fast. Fuelling here is what lets you complete the last rep. |
| 90 min–2 hr | 60–90 g/hr | Electrolyte drink | Now you're genuinely depleting stores. A drink mix plus something solid works well. |
| Over 2 hr | 90 g/hr+ | Electrolyte drink | High intakes need a trained gut — build up over weeks rather than trying it on the day. |
A gel and a sports drink on a gentle hour replaces most of what you just burned. If any part of your goal involves body composition, fuel the hard sessions properly and ride the easy ones on water. This is the most common self-defeating habit in amateur training — see cycling for weight loss.
Afterwards
The classic "30-minute anabolic window" has been substantially walked back — for most amateurs, what matters is total daily intake rather than the precise minute you eat. That said, two situations genuinely warrant prompt refuelling:
- You're training again within about 24 hours. Getting carbohydrate in early speeds glycogen restocking.
- It was a long or very hard session. Carbohydrate plus 20–30 g of protein within an hour or two is sensible.
Otherwise, just have your next normal meal. The advantage of indoor riding is that this is easy — you're already home.
Drink more than you think
The single most common indoor error. Without airflow you'll sweat through a bottle far faster than outdoors, and the first symptoms — heavy legs, drifting heart rate, a headache afterwards — get blamed on fitness rather than fluid.
Two bottles within reach before you start, with electrolytes in at least one, on any session over an hour. And get a fan pointed at your chest, which reduces the problem at source — our pain cave setup guide covers the cooling side, and the hydration strategy guide has the sweat test that gives you your own numbers.
Use the trainer to practise race fuelling
Here's the underrated use of indoor sessions: they are the ideal laboratory for training your gut. Taking 90 g of carbohydrate an hour is a skill that has to be developed over weeks, and doing that experimentation 40 km from home is how you learn things about yourself you'd rather not.
Indoors, the consequences of getting it wrong are a short walk to the bathroom. Run your long weekend rides in Moveee Indoor — riding one of your own real routes rendered in 3D, with the session held in ERG mode — and use them to rehearse exactly what you plan to eat and drink on event day. It's free while in alpha and runs entirely in your browser, and the ride saves into your Moveee log with the rest of your training.
Fuel the hard ones, water the easy ones, drink more than feels necessary, and practise your event nutrition where the bathroom is close. That's the whole indoor playbook.
Sources 7
Where this article summarises a study, the study itself is linked — not a write-up of it.
- 1 Thomas DT, Erdman KA, Burke LM Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance · Medicine & Science in Sports & Exercise · 2016
- 2 Jeukendrup A A Step Towards Personalized Sports Nutrition: Carbohydrate Intake During Exercise · Sports Medicine · 2014
- 3 Jeukendrup AE Training the Gut for Athletes · Sports Medicine · 2017
- 4 Aragon AA, Schoenfeld BJ Nutrient timing revisited: is there a post-exercise anabolic window? · Journal of the International Society of Sports Nutrition · 2013
- 5 Burke LM, van Loon LJC, Hawley JA Postexercise muscle glycogen resynthesis in humans · Journal of Applied Physiology · 2017
- 6 Baker LB Sweating Rate and Sweat Sodium Concentration in Athletes: A Review of Methodology and Intra/Interindividual Variability · Sports Medicine · 2017
- 7 Sawka MN, Burke LM, Eichner ER, Maughan RJ, Montain SJ, Stachenfeld NS American College of Sports Medicine position stand: Exercise and Fluid Replacement · Medicine & Science in Sports & Exercise · 2007
Your own roads, indoors, in a browser tab
Moveee Indoor pairs your smart trainer over Bluetooth and rebuilds a route you have saved as a 3D road — real gradients, ERG for the intervals, and the ride saved with full power data. Nothing to install. Free while it is in alpha.
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