#stretching  act of expanding by lengthening or widening
  supertype:  expansion__enlargement  the act of increasing in size or volume or quantity or scope
  subtype:  tension  the action of stretching something tight; "tension holds the belt in the pulleys"
  subtype:  extension.stretching  act of stretching or straightening out a flexed limb
     subtype:  hyperextension  greater than normal extension

No statement uses or specializes stretching; click here to add one.