When you're talking about fighting, as it is, with no rules, well then, baby you'd better train every part of your body!

In Jeet Kune-Do, physical conditioning is a must for all martial artists. If you are not physically fit, you have no business doing any hard sparring. To me, the best exercise for this is running. Running is so important that you should keep it up during your lifetime. What time of the day you run is not important as long as you run. In the beginning you should jog easily and then gradually increase the distance and tempo, and finally include sprints to develop your 'wind.' Let me give you a bit of warning: just because you get very good at your training it should not go to your head that you are an expert. Remember, actual sparring is the ultimate, and the training is only a means toward this. Besides running, one should also do exercises for the stomach — sit-ups, leg raises, etc. Too often one of those big-belly masters will tell you that his internal power has sunk to his stomach; he's not kidding, it is sunk and gone! To put it bluntly, he is nothing but fat and ugly.

Jeet Kune Do is training and discipline towards the ultimate reality in combat. Jeet Kune-Do is the only non-classical style of Chinese Kung Fu in existence today. It is simple in its execution, although not so simple to explain. Jeet means "to stop, to stem, to intercept," while Kune means "fist" or "style," and Do means "the way" or "the ultimate reality." In other words — "The Way of the Intercepting Fist."

I refer to my hands, feet and body as the tools of the trade. The hands and feet must be sharpened and improved daily to be efficient.

Practice all movements slow and fast, soft and hard; the effectiveness of Jeet Kune-Do depends on split-second timing and reflexive action, which can be achieved only through repetitious practice.

To develop proper distance and penetration against a moving target, use a partner equipped either with a body protector or an air bag. He can either stand still and take the brunt of the kick, or he can back away from the attack. The former teaches proper application of the kick, especially valuable in teaching beginners. The latter training is to teach penetration. As soon as your partner thinks you will attack, he tries to back away as fast as possible. This practice is valuable to both men; one learns to penetrate and the other to back away quickly. The body protector is sometimes used for sharpening the attack. The partner will not attack but will maintain a correct distance in a ready fighting pose. As you begin to attack, he will try to counter, block, or move away. You will have almost the actual feeling of hitting your opponent in a real situation.

The old-fashioned punching speed bag teaches you to hit straight and square; if you don't hit it straight the bag will not return directly to you. Besides learning footwork, you can hit the bag upward too. Another important function is that after the delivery of the punch, the bag will return instantaneously and this will teach you to be alert and to recover quickly. The bag should not be hit in a rhythmic motion but instead in a broken rhythm. Actually fight the bag as if it is your opponent.