Interactive article explaining the physics of a bicycle.
There is something delightful about riding a bicycle. Once mastered, the simple action of pedaling to move forward and turning the handlebars to steer makes bike riding an effortless activity.
Hills are fun. Through nothing more than your own manual effort you’re able to swiftly scale mountains and are rewarded with stunning vistas (and a fun decent).
Good gearing takes care of most hills, and new electric bikes handle tougher hills than that, or get you where you're going without getting sweaty, but a regular bike will usually suffice.
No gearing makes riding up hills "effortless" and sure if you're being pushed up by a motor that's fine, but that's not really a bike, it's a motorbike.