A few definitions to think about.
Blance - The ability to maintain the body center of gravity over its base of support.
Stability - The ability to return to a desired position or trajectory following a disturbance.
Equilibrium - Is the state of no acceleration (no change of speed or direction) of body. - Static Equilibrium - refers to the body at rest or motionless.
- Dynamic Equilibrium - refers to the body in motion with unchanged acceleration created by balanced applied and inertial force
Center of Gravity - The point at which all body mass is equally balanced or equally distributed in all directions.