If you are using a smart trainer and are in a workout, toggle Erg mode (Ergometer) on underneath segments and it will automatically adjust the resistance accordingly so it will be easier to hit the targeted range (power numbers). With Erg mode on, you won't have to change gears or anything so you can just enjoy the scenery and focus on your workout. It automates the workout for you which you may or may not like; it's your choice. Give it a try so you can experience how it feels to see if you like it. The slower you go, the harder it will be to pedal and erg mode will sense it and turn off automatically if you are going too slow. In order to enjoy Erg mode, you will need to be using a smart trainer.