What causes legs to be stiff and hardly can walk?

Stiff legs can be caused by various factors, including muscle strain, joint issues like Arthritis, or neurological conditions such as multiple sclerosis or stroke. Dehydration and electrolyte imbalances can also contribute to muscle stiffness. Additionally, prolonged inactivity or sitting can lead to temporary stiffness. If stiffness persists or is accompanied by pain, it's important to consult a healthcare professional for a proper diagnosis.