Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Laing distal myopathy ?
    ### Response:
    Laing distal myopathy is a slowly progressive muscle disorder that tends to begin in childhood.   Early symptoms include weakness in the feet and ankles, followed by weakness in the hands and wrists. Weakness in the feet leads to tightening of the Achilles tendon, an inability to lift the big toe, and a high-stepping walk.
    