also: ふくきん · はらすじ
noun
abdominal muscles; abs
Refers to the muscles themselves. Common in both everyday and fitness contexts.
毎日腹筋を鍛えている。
I train my abdominal muscles every day.
彼は腹筋が割れている。
He has well-defined abs.
noun, noun or participle which takes 'suru', intransitive verb
sit-up; ab exercise
Only with reading ふっきん / ふくきん
Abbreviation of 腹筋運動. Used for the exercise itself. Often used with する to mean 'do sit-ups'.
See also: 腹筋運動
毎晩寝る前に腹筋を30回する。
I do 30 sit-ups every night before bed.
腹筋をするとお腹が痛くなる。
My stomach hurts when I do sit-ups.