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It depends what type of ebike. Some have a throttle which "keeps going for you", like mine. Others are a type called "pedelec" which requires you to pedal before the motor will kick in. It's a hell of a lot of fun. It feels like cheating, and some people say it is, but it's all the fun of cycling with none of the downsides. You exercise as much or as little as you want.

I've seen a few people take them up the single track outside our city. As I was grinding hard...they were flying up. Certainly felt like cheating then ;)