Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Cap myopathy ?
    ### Response:
    Cap myopathy is a disorder that primarily affects skeletal muscles, the muscles that the body uses for movement. People with cap myopathy have muscle weakness (myopathy) and poor muscle tone (hypotonia) throughout the body, but they are most severely affected in the muscles of the face, neck, and limbs.
    