Be water my friend

Bruce Lee keeps his muscles guessing as to what is coming next. He enjoyed innovating new exercises to stay in shape and active for stunts.

Empty your mind, be formless, shapeless — like water.
When you put water in a cup, it becomes the cup;
When you put water into a bottle it becomes the bottle;
When you put it in a teapot it becomes the teapot.
Now water can flow or it can crash. Be water, my friend.
Bruce Lee believed that as a warrior and as a person, one should never “get set into one form. One should adapt and create your own style, and let it grow, be like water”.

Bruce Lee Philosophy
Bruce Lee had his own way of defining martial arts and how to train to really fight. He did not go along with the traditional methods of other martial art styles. He believed in using whatever worked best from every style and putting them together.
Bruce Lee's fitness training also followed that thought and he worked hard at it to be the best he could be.Mixing different exercises to stress out the body in a more realistic way is what he did which was in a way ahead of his time, what he tried to do in the 1960's is kind of what has become popular today.
Bruce Lee’s physique

Bruce is well known for his incredible physique. His body fat level was very low. He only weighed about 140lbs and stood 5' 8" tall; he was not a large person in size but was huge in confidence.
Bruce lee’s passion for fitness
Bruce would try everything and anything to achieve his goal of perfection in his physical fitness. He would experiment with his workouts trying to find the best way to reach his goal.  He was big on improving his cardio vascular condition, he believed running to be the best way to achieve this. Bruce Lee would lay in front of the TV in the evening with his son Brandon sitting on him while he worked out. He was a big reader and had an extensive collection of books on exercise, fighting techniques and philosophy.