If you have a mid- to top-end smart trainer - and use some of the best training apps for cycling, such as Zwift - then you'll have the option of completing your indoor workouts using ERG mode. But what, exactly, does this setting do?
Put simply, when ERG mode is switched on, your bike trainer will help you ride at a set power output by automatically adjusting the resistance to match your cycling cadence - no matter how fast or slow you turn your legs, the trainer will adjust itself to keep you at that set wattage.
