The inability to bend forward and pain with shoulder movement suggest possible muscle strain or stiffness, which could be due to poor posture, sudden movement, or sleeping in an awkward position rather than solely a lack of exercise or flexibility.
Next Steps
Avoid aggravating movements and try lying on your back with a pillow under your knees or on your side with a pillow between your legs to reduce strain.
Do a slight knee-to-chest stretch to ease tightness, but stop if pain increases.
Health Tips
Since this is recent and affecting your mobility, it’s best to consult a physiotherapist for a thorough evaluation, especially if the pain worsens, or is accompanied by numbness, tingling, or weakness.