It's about what you can do at that particular moment. If someone is stuck in a fire and you say, "Well, two years ago I could have done something that would have saved you" then you are useless. Parkour is not what you could have done for whatever excuse. If you aren't able to help someone, what use are you?
"Parkour belongs to the ones who live it, not the ones who want to live thanks to it"
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