In my case, a lot of it comes from my mountain biking hobby. I like doing unauthorized trail maintenance - sawing fallen trees off the path, laying logs over streams and mud pits so I (and others) can cross with dry feet. In winter, I sometimes ride the same trail back and forth multiple times so my fatbike tires can flatten the snow, which then freezes overnight into a perfect surface for dog walkers to walk on.

In my job, I occasionally spend my own time improving something beyond what the customer is paying me for.

At my gym, I always fill the water bucket in the sauna for the next person.

Once I also bought the supplies and fixed a hole in a fence that’s meant to keep moose and deer from walking onto the highway.