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