I'm sorry, I don't know what you are responding to with "Probably bikes right?". Cities that are built for living typically include massive investments in pedestrian infrastructure, including bikes, if that is what you are saying. Biking is not feasible in most suburbs because of the distance. Cities that care about reducing traffic, such as Amsterdam, absolutely have more children biking than a suburban area. Unfortunately a lot of cities in the United States were built for cars and not people.

I'm an avid cyclist. Just from personal observation, outside of high density urban areas I see very little people on bicycles.

Now I moved out of NYC to the suburbs - I know every cyclist in the area, and that's me plus 2 other people. I barely ever see bikes...