Mobility is not passive flexibility; it is usable strength through active ranges of motion. Master thoracic extension, hip capsule opening, and ankle dorsiflexion.
Flexibility is the passive range of motion through which an external force can pull your limb. Mobility is the active control and usable strength you possess within that range. Without active muscular control at end-ranges, flexibility alone does not safeguard joints from injury.
The Big Three Restriction Zones
- Ankle Talocrural Joint (Dorsiflexion): Restricted ankles force knees to cave inward and hips to tuck early during squats.
- Hip Capsule: Prolonged sitting shortens hip flexors and shuts down gluteal activation.
- Thoracic Spine: A stiff, hunched upper back prevents safe overhead bar lockout and compromises shoulder blade mechanics.
References
- Cook, G., et al. (2010). Movement: Functional Movement Systems: Screening, Assessment, Corrective Strategies. On Target Publications.
About the Author: David Chen, CPT, FMS-2 (Mobility & Functional Training Editor). David Chen is a movement specialist who works with athletes to eliminate chronic movement restrictions and build resilient joints. With a background in competitive gymnastics and functional strength training, David writes on joint mobility, warm-up sequencing, movement screens, and active recovery routines that enhance lifting longevity.
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