The tricks and feats are dangerous and, I just wanna go ahead and say that you shouldn't try them at home! If you do, please go slowly and learn as much about each thing before you attempt it. You can actually do the following training without any flips or crazy things, but it just makes it harder if you do it that way.
Naruto Ninja Movement
Run a 2 mile course or for 20 minutes. Run in as straight a line as possible, traversing the obstacles in your path as quickly as you can. This will require running, jumping, climbing, swinging, and possibly crawling and swimming. Of course, some obstacles will be impassable, but try before you give up. Be careful and, if something looks too dangerous, skip it or go around.
Until next time, train hard.
PS- If you don't know what parkour or free running is-- GOOGLE IT!