#arm_exercise__armexercise  exercise designed to strengthen the arm muscles
  supertype:  #physical_exercise__exercise__exercising__physical_exertion__workout  the activity of exerting your muscles in various ways to keep fit; "the doctor recommended regular exercise"; "he did some exercising"; "the physical exertion required by his work kept him fit"
  subtype:  #pushup__press-up__pressup  an arm exercise performed lying face to the floor and pushing the body up and down with the arms
     subtype:  #widegrip_pushup  a pushup with the arms widely separated
  subtype:  #chin-up  an arm exercise performed by pulling yourself up on a horizontal bar until your chin is level with the bar

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