Yes, so Denmark is an exception to the rule where biking is always uphill and against the wind. In Denmark, it's only against the wind. That said, you are righ

Yes, so Denmark is an exception to the rule where biking is always uphill and against the wind. In Denmark, it's only against the wind. That said, you are right. E.g. I live in Finland, and biking is more popular in Oulu (which is way up north, but on former seabed and completely flat) than in Helsinki (which has a more temperate climate, but is on exposed bedrock and has small-scale hills up and down all the time).