An exercise in which the abdominal muscles are contracted, bringing the torso of a person lying down to a more upright position. The degree of difficulty can be controlled by choosing from partial-range or full-range versions..
현재 검증된 한국어 뜻은 준비 중이며 영어 정의는 “An exercise in which the abdominal muscles are contracted, bringing the torso of a person lying down to a more upright position. The degree of difficulty can be controlled by choosing from partial-range or full-range versions.”입니다.