Excessive sedentary behavior negatively impacts posture by weakening crucial muscle groups, particularly those responsible for spinal alignment. Prolonged sitting can cause tightness in the hip flexors and weaken the back muscles, leading to slouched postures. Over time, this can contribute to chronic pain, particularly in the neck and back. Incorporating regular movement and ergonomic adjustments in sedentary settings can help mitigate these effects and promote better postural health.