Simplify the following text for a Grade 12 native English-speaking person.
Original: Rhythmic gymnastics is a sport in which individuals or teams of competitors ( from 2 to 6 people ) manipulate one or two apparatus : rope , hoop , ball , clubs , ribbon and Free ( no apparatus , so called `` floor routine '' ) .
Simplified: Rhythmic gymnastics ( short : RG ) is a sport in which individuals or teams of competitors ( generally five ) manipulate one or two apparatus : rope , hoop , ball , clubs , and ribbon .