Dr. Krista Fazio / Rehab, Injury and Exercise Expert on Instagram: "👇🏻Why you ALWAYS feel stiff ! When a muscle is underactive, unstable, or lacks load tolerance, the central nervous system perceives THREAT in that region (instability = potential for injury) In response, the muscle spindle fibers increase their firing rate to resist stretch… this is the stretch reflex AKA neuromuscular Inhibition. The brain essentially says, “We’re not strong enough here, let’s tighten up to protect the joint.