The 8 Key Concepts give us guidance in Pysical and Mental training.
Yong Gi - Courage Chung Shin Tong Il - Concentration
In Neh - Endurance Chun Jik - Honesty
Kyum Son - Humility Him Cho Chung - Control of Power
Shin Chook - Tension / Relaxation Wan Gup - Speed Control