One, no one ever offered to forget training in your sport and simply do weight training. Bruce trained hours a day martial arts (let's not forget as I said he was a teacher/trainer for 7-8 years before the first big movie role and still trained harder than anyone at the time. (as per Chuck Norris, Bob Wall, Jim Baker, etc..)
Two, every athlete in any sport supplements their training with resistance training, plyometrics and other similar training.
The famous story is that Bruce Lee took on a challenger in 1964 a fight that lasted almost 3 minutes and he was disappointed it took so long and also that he was so winded. That was the turning point that made him a fanatic about training and endurance and changed the course of his training going forward.
Look at him in 1964-1965 versus where he was in in 1971. Major body change.
So you have not said anything different that what I am discussing.
Bruce Lee's routines changed constantly. He was always studying and looking for improved techniques and discarded what was time wasting. If you research his routines you will see over time how he added in new elements a lot, which is why he developed the physique that he did. I am offering to discuss in this thread many of the techniques that he used for various results.
I know, I didn't mean to imply anyone said anything about just doing weight training.
Don't mean to take it off topic as it started simply as talk of his fitness and training regiments. But you did say Bruce trained specifically for speed and power to support martial arts, and that's what I was commenting on. Just saying, what can be better than the top training methods used currently for that specific purpose.