Burton is a 45-year-old male patient with a long-standing history of hypothyroidism who presents with complaints of increasing fatigue, cold intolerance, and muscle stiffness. Physical therapy examination reveals slowed reflexes and generalized muscle weakness. Which intervention should be prioritized in this patient's treatment plan?

A. High-intensity resistance training

B. Aerobic exercise for endurance training

C. Gentle stretching and range of motion exercises

D. Balance and proprioception training

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