system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can I balance on a bicycle while it is moving, but not while it is stationary?
gpt
All the detailed physics theories aren't necessary here.

While moving, a rider is simply able to steer the bike back under him/her as they inevitably begin to fall one way or the other.

And to ride with no hands - notice that due to the design of the front fork, whichever way the bike leans, the front wheel will turn toward having the same effect as steering the bike back under you with hands on the handle bars.