the jeet kune do school i attended offered jun fan, muay thai, kali, savate, and grappling. i am not sure if it is aggresive out there but we would put on the gloves and go at it. all i can say is lots of black eyes, busted lips, bloody noses. of course you had to sign a contract saying you can't sue no matter what. sometimes we even had dislocated joints. ouch.