A nurse is providing teaching about nonpharmacological pain management to a client who has osteoarthritis. Which of the following instructions should the nurse include in the teaching?

Heat therapy (such as a daily hot shower) increases circulation, relaxes muscles, and reduces joint stiffness — all beneficial for osteoarthritis pain management. A large pillow under the knees flexes the joint and can worsen pain and contractures with prolonged use. Ice packs should never be placed directly on skin; a cloth barrier must be used to prevent frostbite. Phosphorus restriction is relevant for renal disease, not osteoarthritis.