The martial arts are based upon understanding, hard work and a total comprehension of skills. Power training and the us of force are easy, but total comprehension of all of the skills of martial arts is very difficult to achieve.
To understand you must study all of natural movement in all living things. Naturally, you can understand the martial arts of others. You can study the timing and the weaknesses. Just knowing these two elements will give you the capacity to knock him down rather easily.
Tao of Jeet Kune Do