Balance (Static vs Dynamic)

Balance is the capacity to maintain the body's line of gravity (center of mass) within the base of support, whether the body is stationary or moving. It is not a single faculty but the output of the postural-control system, which integrates sensory information (see proprioception, somatosensory-system, vestibular-system, visual-system-balance) and produces continuous, often unconscious, muscular corrections.

Two functional categories are distinguished:

• Static balance — maintaining equilibrium while stationary, with the base of support unchanging (standing still, holding a single-leg stance, holding a tandem stance). The challenge is to resist the body's natural postural sway and any external disturbance without stepping.
• Dynamic balance — maintaining equilibrium while the body or base of support is moving (walking, turning, reaching beyond the base, transitioning from sit-to-stand, descending stairs). Dynamic balance demands anticipatory and reactive control and is the form most relevant to daily function and fall avoidance.

Balance sits within the broader category of neuromotor fitness (see neuromotor-fitness), the ACSM "neuromotor" pillar that also encompasses agility, coordination, and gait. Balance training is graded by reducing sensory input or shrinking/destabilizing the base of support (see balance-training-progression).

Balance is distinct from flexibility (flexibility-benefits): flexibility is available range of motion, whereas balance is the neuromuscular control of position. It is also distinct from raw strength — a strong person with poor proprioception or vestibular function can still have poor balance.

• Definition: keeping the center of mass over the base of support.
• Static balance = equilibrium while stationary (base of support fixed).
• Dynamic balance = equilibrium while moving (base of support changing); most relevant to fall prevention and daily function.
• Output of postural control integrating somatosensory, vestibular, and visual input.
• A component of neuromotor fitness (ACSM neuromotor pillar).

• proprioception, somatosensory-system, vestibular-system, visual-system-balance — the sensory inputs balance integrates.
• postural-control — the control system that produces balance.
• neuromotor-fitness — the fitness category balance belongs to.
• balance-training-progression — how balance is trained and progressed.
• dynamic-balance-drills — dynamic-balance applications.