WFPF

This bears repeating.  In fact, this bears endless repeating.

For the general public, the extent of interaction with their local freerunner is likely to be, "Hey kid!  Get down from there before you hurt yourself!"  And honestly, it's really really difficult to educate your typical mundane on the finer parts of practice, on the philosophy and research and global support that goes into that resident practitioner's particular flavor of steps when they're dutifully trying to save a stupid kid from breaking themselves by doing something stupid.  So how do you, the runner, enlighten your local community?
For one, you do your best to work *with* that community and try not to make a nuisance out of yourself -- show them that you can do the moves safely and sanely, and that you can be respectful about sharing public spaces with the public.
For the rest... you can't stop every concerned onlooker and explain your training history, complete with showreels and cited tutorial videos.  What you *can* do is let everyone in the near vicinity hear you say two words that sum up the bottom line of every practitioner's routine:

"Safe training."

It's quick and it's simple.  When you're out running, when you're with your buds or at a jam, let that be your hail, your greeting and your farewell.  When you see a fellow runner out doing their thing, send them those words.  I've heard these as a blessing, a simple well-wish, said at the end of chat conversations held with people from around the world: "Thanks for the talk, catch you later, safe training."  Make it your call, and let people hear.  Let these be the words that the public associates with freerunners, the constant reminder of "safe training."

Because, and this is the important part: when you're out training where people can see, there's no "parkour community" -- it's just you.  You represent this whole amazing global network of people who are all driven by a passion that none of us can adequately describe but all of us understand.  That passion lets us greet each other with open arms as family, collaborating on a common ground that we would never find otherwise.  There are some amazing people out there who are willing to embrace you as an equal, represent your image as fiercely as their own and fight for your good name even if they've never seen your face.  And the truly great thing about this is, they'd only ask for you to do the same in return.

I won't let you down. I know you won't let me down, either.

Safe training.