The ITERATE statement allows  you  to  explicitly  reexecute  a  FOR/NEXT,
  WHILE,  or  UNTIL  loop.   ITERATE  with  no  argument is equivalent to an
  unconditional branch to the current loop's NEXT statement.   ITERATE  with
  an argument transfers control to the specified loop's NEXT statement.

  Example

  ITERATE My_loop IF A >= 500