If you have a smart trainer, knowing the difference between ERG and SIM and when to use each will make your rides more effective. SIM mimics real road conditions for more immersive rides while ERG locks in a target wattage and adjusts resistance around that.


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Zwift is the fitness company born from gaming. Play is in our DNA because we know fun fuels results.

Utilizing massive multiplayer online gaming technology to create rich 3D worlds, Zwift is the place to level up your performance. Explore, train, and compete with a community of thousands of cyclists and runners in immersive playgrounds like London, New York, Paris, our very own Watopia and Makuri Island, and many more.

Zwift’s integrated software and hardware allow members to connect to our app and power their avatar in our game using real-world effort. This immersive, social, and fun experience delivers serious results. Because when you’re having fun, your fitness follows.