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ERG mode is the feature that makes structured indoor training almost effortless to execute: you set a target wattage, and the trainer holds you there no matter your cadence. It used to require installing a desktop app. Not any more — ERG mode in the browser works on any modern smart trainer, from a single tab, for free. Here's how.
What ERG mode actually does
Normally your power depends on how hard you push and what gear you're in. In ERG mode, you hand that job to the trainer: you name a target, and the trainer continuously adjusts its own resistance to keep you at that exact wattage. Spin at 85 rpm or 95 rpm — the watts stay put. Your only job is to keep pedalling.
You set a target
Say 220 W for a 5-minute interval. The workout knows the target for every block.
The browser sends it to the trainer
Over Web Bluetooth, the tab tells the trainer: hold this rider at 220 W.
The trainer adjusts resistance
Pedal slower and it makes it harder; pedal faster and it eases — to keep you at 220 W.
You just turn the pedals
No shifting, no chasing a number. Hit the interval, recover, repeat.
Yes, the browser can really do this
The same standard that lets a web page read your power (FTMS / Fitness Machine Service) also lets it command the trainer's target. So a browser tab in Chrome or Edge can drive ERG mode exactly like a native app — no install, no dongle. If your trainer does ERG in its own app, it'll do ERG in the browser.
Escaping the "spiral of death"
One thing worth knowing: if you let your cadence fall too far in ERG mode, the trainer keeps cranking resistance to hold the watts, which slows you further — the dreaded spiral. The fix is simple: keep your cadence up, and if you do bog down, ease off for a second or shift so the trainer can recover. Good apps also let you nudge the target on the fly.
ERG in the browser, on a real road, free
Moveee Indoor holds ERG targets from a browser tab on any standards-based smart trainer — so your intervals are precise — while you ride your own saved routes rebuilt in 3D from real map data. Nothing to install, free while in alpha, and rides save with full power data to your Moveee plan and Strava.
Set the target, keep the legs turning, let the trainer do the rest. That's ERG — and it lives in a browser tab now.
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