You may understand them at first glance, but as you progress, you will understand them better and often in a different way. The spirit must draw together the body and the instincts. When the mind is dissipated, the physical and mental force which is in you loses its co ordination. Painful exercises improve the concentration, and enable you to discover the truth about yourself. Execute everything in one solid, unified action, instantaneously.
Mental concentration can lead to an apparent increase in weight, as well as efficacy.
The eyes must attack first of all, followed by the foot then the fist, but all must reach the target at the same time. The important thing about an attack is . . . Unity of action takes precedence over the speed of the action. In order to be fast and supple at middle level, it is necessary to train very deep and low. Never at any moment lose your stability, for your opponent will not let it pass in real combat.