"like riding a (bike|bicycle)" 的定义和意义

What is the origin of the idiom "like riding a bike" and when to use it?

The idiom "like riding a bike" is used to describe an activity or skill that, once learned, is not easily forgotten and can be easily resumed after a period of not doing it. This expression is originated from the fact that the ability or knowledge that is deeply rooted in one's mind, can be quickly and effortlessly recalled. The phrase likens the experience to riding a bicycle, which many people learn in their childhood and typically retain throughout their lives.