This can be understood by the following;

HO SHIN SUL - Self defence from external force.

• SUL GI - The defense against a physical attack.
To use a minimum amount of force to control the attack.
From beginner to 4th Dan.

• BI GI - Advanced technique, controlling the enemy without struggling against the attack.
Up to 7th Dan.

• SIN GI - Highest level tehcniques
The enemy should be unable to see the defence, if the defence is seen then the attacker can still do nothing about it.
Up to 10th Dan.

HUAL IN SUL - Self defence internally
The combination of ones own inner and outer energies. Inner is achieved through meditation and stimulating circulation, concentrating all of your inner energy to the source of the problem e.g. an injury. This practice also helps to maintain good health.

HAP KI SOOL - Self defence of the mind

• How to concentrate the mind

• How to clear the mind

• How to empty the mind

For an easier understandaing please read the following;

HO SHIN SUL - Self defence from external force. Confidence
The Stages of Ho Shin Sul enhances your physical training skills to develope confidence in technique and body control.

HUAL IN SUL - Self defence internally. Health
Maintining good health with a combination of ones own inner and outer energies.

HAP KI SOOL - Self defence of the mind. Peace of Mind
By practicing all aspects allows you to acheive peice of mind.