When you sit on a standard surface, your spine compresses. Your tailbone bears 40-90% of your body weight. Your lumbar curve flattens against the chair back.
This compression accumulates. Hour after hour. Day after day. Your discs lose hydration. Your muscles tighten to compensate. Pain becomes your constant companion.
Exercises help — but they can't undo 10+ hours of daily compression. New mattresses help you recover at night — but don't address the 8+ hours you're destroying your spine during the day.