Balance (Static vs Dynamic)
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The ability to keep the body's center of mass over its base of support — held still (static) or while moving (dynamic) — through continuous coordination of the somatosensory, vestibular, and visual systems.
Detail
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 for Balance, Vestibular System for Balance, Visual System for 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), which the ACSM 2011 position stand (Garber et al.) describes as training motor skills such as balance, coordination, gait and agility, plus proprioceptive training. Balance training is graded by reducing sensory input or shrinking/destabilizing the base of support (see Balance Training Progression).
Balance is distinct from flexibility (Benefits and Outcomes of Flexibility Exercise): 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.
Key facts
- 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 2011 position stand).
Connections
- Proprioception, Somatosensory System for Balance, Vestibular System for Balance, Visual System for Balance — the sensory inputs balance integrates.
- Postural Control (Ankle, Hip, Stepping Strategies) — 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.
Sources
- Position standGarber CE et al. American College of Sports Medicine position stand. Quantity and quality of exercise for developing and maintaining cardiorespiratory, musculoskeletal, and neuromotor fitness in apparently healthy adults: guidance for prescribing exercise. Med Sci Sports Exerc 2011;43(7):1334–1359 Published 2011 · DOI 10.1249/MSS.0b013e318213fefb · Accessed 2026-10-13
Corrections (1)
- 2026-10-13 — Sourced the neuromotor framing to the ACSM 2011 position stand (Garber et al.), which defines neuromotor (functional fitness) training as motor skills such as balance, coordination, gait and agility, plus proprioceptive training. Removed the unsupported 'general balance definitions per ACSM/NSCA' attribution: the static/dynamic definitions are standard motor-control usage, not a stated ACSM or NSCA definition.
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