Don’t Show. Do not telegraph techniques, those little ‘tells’ that allow an experienced fighter to anticipate your moves. Keep a "poker-face." This also applies to show of pain or weakness. The only time that showing pain or weakness is a good strategy is when it is being faked, to lure the opponent into a trap, or possibly to gain sympathy from either the opponent or judges.
Split Second. This is the practically immeasurable length of time that every muscle in the body should be tensed and that the mind should be focused upon impact with the opponent. In other words, there should be no tension as the technique is executed, only for an instant on impact, and there should be an immediate return to a calm, relaxed state after that impact.
Expansion/Contraction. Expansion and contraction of muscles generate speed and power. It is important to note that power can be generated both by expansion and by contraction, and that both have appropriate and inappropriate uses.