Cycling isn’t cheating. Our rules state that:

In WalkScape, steps are generated by walking with your legs. We strongly oppose any non-walking methods of generating steps and discourage promoting them in our community (Reddit, Portal, Discord). The only exceptions are situations, where the leg is naturally moving in ways that count as steps (such as cycling) and only as long as the step rate is low enough to not be abusable.

There’s no specific support for cycling, but a lot of people do play the game that way. You do get some steps from cycling if you have your phone in your pocket although it’s not as efficient as walking.