"(...)He combined boxing punches, grappling, low and high kicks in a unique style that was criticised vastly by most traditional martial artists at the time. Today all mixed martial artists are training in a similar way."
"Back in Lee’s era, no training equipment was available. He had to invent it. His focus gloves and his fighting gloves are very similar to the ones that are used in MMA training today. If you see some techniques in his books (and his films), you will find out that his style can still be used in a ring effectively. The techniques used in his movies are a bit flashier but full of martial arts wisdom. Guess what? He finished most of his opponents with grappling. In "Way of the Dragon " he finishes Chuck Norris with a neck break. In "Game of Death" he beat Kareem Abdul-Jabbar with a headlock. In “The Big Boss” the final fight ends with a mount."
"Bruce created a unique style of fighting which is very effective in the way he used it. Here are some strong points:
1.He used kicks to the head. If he did not use them (like some people claim) he would not train for them. Kicks to the head CAN be very effective, especially roundhouse kicks. I have seen hundreds of fights. I haven’t seen anyone take a good roundhouse kick to the head and not go down. Even a tough fighter like Don Frye could not survive against a good roundhouse kick thrown to him by Jerome Le Banner.
2. He was one of the first to use boxing training methods and protective equipment in sparring.
3. He explained why a technique is effective before he taught it. Back then, in other martial arts, you either accepted tradition or you were out of the school.
4. He trained his punches and kicks against live targets (like focus gloves) or against the fearsome body bag. The noise of a snapping gi was not enough for him. He had to know that his attacks were effective.
5. He was the first martial arts master that stressed the importance of a cardiovascular workout. He was really tired of seeing big-bellied masters that would not last a single round against a boxer in a ring. For Bruce, the best kind of endurance and cardiovascular training was running.
6. Most martial arts make a common mistake in their training. They train their students against attacks that are used in a stiff and robot-like manner. No enemy ever attacks like that. And you can be sure that most attackers will not attack you with a reverse punch or using a traditional martial arts move. Bruce trained his students against boxing punches and tae kwon do kicks. "
Źródło:
http://www.fightingmaster.com/masters/brucelee/master.htm