Population density: sure. Hills: that's not really true if you have a bicycle with a gearing system. You can get a cheap new one with 7 speeds for about the sa

Population density: sure. Hills: that's not really true if you have a bicycle with a gearing system. You can get a cheap new one with 7 speeds for about the same as a smart phone. That's enough to get past most hills with some but not a lot effort, especially if it's tuned to out-of-shape persons (which modern bikes seem to be). You can always get off and walk the steepest slopes.