“When did you start parkour?”
“When did you stop?”
Everyone did at least a bit of parkour as a kid. At one point in your life, you climbed a tree, a rock, a rooftop. You jumped and tumbled off furniture because it was fun. Remember “floor-is-lava?” You still play? I still play floor-is-lava almost every day. If you like(d) that game, you might enjoy parkour too.