Why isn't cycling more popular?

I'm curious, why isn't cycling more popular as a mode of transportation and exercise? It seems like a cost-effective, environmentally-friendly, and healthy way to get around. Could it be due to a lack of infrastructure, like bike lanes or bike racks? Or is it simply a matter of preference, with people choosing other forms of transportation for convenience or personal preference? I'd love to hear your thoughts on why cycling hasn't gained more widespread popularity, and what could potentially be done to encourage more people to give it a try.