Many adults only remember bike riding as a child rather than continuing to ride as an adult. People often give up on bike riding as they get older and become dependent on other forms of transportation. Adults can and should take advantage of bicycle riding to get some exercise. Older folks may want to ride the large tricycle with a basket on the front.
We all remember our first bicycles. Mine was a single speed blue bike with a banana seat and it took me everywhere I wanted to go. All the kids in my neighborhood had bikes and often we would set off as a group for a lengthy ride just for the fun of it.