The SAID principle (Specific Adaptation to Imposed Demands) is a classic sports medicine term that describes how physical adaptations develop when the body is placed under stress, thereby allowing the body to better handle future stressors. A common example is the tennis pro whose arm muscles, ligaments, and bones thicken in response to excessive demands from the one-sided sport. Simply put, the body gets better at doing whatever it does regularly. If that means sitting for hours in a flexion-dominant posture or performing exercises using poor form and less-than-perfect posture, the body will get better at adopting poor form and less-than-perfect posture. This is postural plasticity at work.
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