She hops on her tricycle as a toddler, gets the hang of it and enjoys herself for a little while.
When riding the tricycle becomes second nature — maybe even a little boring — she eagerly seeks something more challenging. It’s time for a “real” bike. She leans on training wheels at first, so she won’t fall flat as she struggles to learn the delicate balance she needs in order to keep moving. She’s not ready for hills and curves, but she’s enjoying the wind in her hair and the fresh air in her face. She enjoys herself for a little while more.