If you’ve ever started up a spin bike, you know about flywheels.

They take a lot of effort to get going, but once they’re off, the energy you put in is released, making it much easier to keep momentum going for longer.

That’s a pretty good metaphor for building a system for making and keeping promises.   It takes effort to get up and running, but once it is, it can keep going almost forever.

Long after you’ve jumped off the bike.