Psychology, Weight Training, good orientation skills..so you can navigate through the city with great ease, practice lifting yourself from ledges (back shoulder muscles), defensive driving course, a will to do good, a brain..you don’t want to take on 5 or even 2 people with guns, self defense (must be able to take on 4 people), practice disarming people with knives (you really need to be good with this), go on a track and field team and practice 3000m (thats 7.5 laps), must be able to get “insider information” in gangs and criminals so you know what they do and their patterns, learn about peoples field of view (195 degrees), practice hiding/stealth (this is a must), and finally you should try this sport..I forget what its called but its basically you jumping around the city climbing whatever..you need to be the master of that too..

Its not easy but you being able to take on fagets in a dangerous situation is awesome (just don’t do something stupid and stand up infront of a guy that has a sawed of shotgun to your face). Think before you jump.