Understand that this art has ...

Understand that this art has been created by few soldiers in Vietnam to escape or reach: and this is the spirit I'd like parkour to keep. You have to make the difference between what is useful and what is not in emergency situations. Then you'll know what is parkour and what is not. So if you do acrobatics things on the street with no other goal than showing off, please don't say it's parkour. Acrobatics existed long time ago before parkour.
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 David Belle

Quotes from the same author

When a young person asks me: 'Can you show me how to do this?' I simply answer: 'No, I am going to show you how to do it. But then, you'll have to learn with your own technique, your own way of moving, your style, your abilities and your limitations. You are going to learn to be yourself, not someone else.
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 David Belle
My thing from the beginning is to have it be useful, and be able to help others. It's about being efficient and getting there as fast as you can. If people want to do it more artistically or in a freestyle way, I have absolutely no problem with it — that's the way it's going to evolve. It's not my style, but if it's other people's [style], that's perfect.
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 David Belle
A lot of people in their mind think ‘If there is a problem this is what I would do, this is how I would do it.’ But the truth is they don’t really know. Parkour teaches you to be sure of what you are able to do.
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 David Belle
Parkour teaches you to be sure of what you are able to do.
 See image
 David Belle
So if you do acrobatics things on the street with no other goal than showing off, please don't say it's parkour. Acrobatics existed long time ago before parkour.
 See image
 David Belle