Hi Pinecone!
I main parkour because I never run out of things to do on it. Unlike kitpvp and creative, which I do sometimes, if you don't feel like pvping and raging after a while, or if you don't feel like Just building, I'm able to do parkour maps. Ever since I got Minecraft, even when I was using Windows 10 edition (now I think about 10 edition as yich), I logged onto servers and played parkour. And, to add to that, REPETITIVE JUMPS!
Once I got on manacube parkour, I've been able to train myself to the maximum, and I can now do Parkour Pyramid, the world's "hardest parkour map", with absolutely no sweat.
Parkour also helps me with speedrunning skills in a survival world.
Plus, the good half of parkour is an amazing community.