In Denmark the wind is our mountains.
Because it is so flat but the wind makes up for the hilly bits.
While cycling around in Denmark I noticed that most of the bikes people are commuting on are the “sit up and beg” types. These bicycles are not really aerodynamic, as you sit up and get the wind right in your face.
Tough if you are lucky enough to commute with the wind in your back, the “sit up and beg” position is a life saver :)