An anecdote: I own a recumbent bike. Learning to ride it wasn't difficult, I was able to wobble around and had to regularly put my foot down the first couple m

An anecdote: I own a recumbent bike. Learning to ride it wasn't difficult, I was able to wobble around and had to regularly put my foot down the first couple minutes and got my balance for real within a day. I let other people ride it when they ask me about it and my experience seems fairly normal. By contrast, at one point I went 10 years without riding a bike. When I got back on, I could immediately ride. No wobbling, no learning curve. I've seen videos of other adults learning to ride bikes and it doesn't take them long to learn how to ride but it's not immediate.