1. Actual Fight in Form : Fight with the imaginary opponent, who is yourself.(Ch. 49)

Poomsae differs from dance. You should fight and control over your opponent in poomsae. And you should not practice but fight actually in poomsae. That fight is one with yourself.

2. Sseuim-sae :

The sseuim-sae is the skill or method of how to control over the opponent and protect youself, i.e. the principle of organizing motions in poomsae. So the meaning of each motion in poomsae; what is this motion for, is the sseuim-sae. (Ch.51)

3. Sseuim-nal :

Just as the sharp edge of a nife is necessary to cut something the powerfulness in motions of poomsae is necessary to fell down and suppress the opponent when the motions were used along the way of sseuim-sae, and this is the sseuim-nal.(Ch. 51)