Parkour did a weird thing where it just seamlessly assimilated into my everyday life, and it ended up feeling like I had always been doing it. I guess it did replace skateboarding and rock climbing, but most of the changes that came from parkour were pretty subtle. However, there are two things it changed.
Since for a long time I was the only one in my high school/college peer group who practiced parkour, it always fell on me to mentor new people who wanted to try. I ended up taking a heavy leadership role as a result.
The second is coaching parkour is the reason why I live in New York right now.