A good trainer or roll set is not only for the moments that the weather forces us to drive indoors, but also for the time-consuming cyclist, city drivers with limited routes or anyone who is recovering from an injury. Even the most hardened winter drivers sometimes love the environment in which they drive control.
Rollers, on the other hand, usually require more concentration. Rollers consist of a set of cylinders attached to an external frame, and work as a treadmill for your bike - you just step up and start driving. Because you are free to move back and forth, and depend on your own balance to remain upright, it is easier to get an accident if you don't pay attention. But rollers generally offer the most realistic feeling ride.