#acrobat  an athlete who performs acts requiring skill and agility and coordination
  supertype:  #athlete__jock  a person trained to compete in sports
  subtype:  #aerialist  an acrobat who performs in the air (as on a rope or trapeze)
     subtype:  #ropewalker__ropedancer  an acrobat who performs on a rope stretched at some height above the ground
  subtype:  #balancer  an acrobat who balances himself in difficult positions
  subtype:  #circus_acrobat  a acrobat who performs acrobatic feats in a circus
  subtype:  #contortionist  an acrobat able to twist into unusual positions

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