Parkour Legal Issues
Can I be arrested for participating in Parkour?
Although Parkour as a sport is not illegal, as it doesn't in itself involve vandalism or trespassing, some Parkourists do break the law, which has started to give a bad name to the sport. As long as you stay away from private property, and don't try to break the law in any way while participating in the sport, you should have no problems with the Police.
Just use your head, and don't go anywhere you wouldn't usually be allowed to, and be careful where you do your tricks!