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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Jackknife (exercise) ： ウィキペディア英語版 Jackknife (exercise) A jackknife is an abdominal exercise. Jackknife exercises are designed to work the abdominal muscles, particularly the lower abs. There are a number of variations of jackknife exercises that allow people of different ages and ability to work their abdominal muscles.The jackknife can be done on an exercise ball, exercise bench, the floor or on an exercise mat. == Instructions == *Preparation.- Sit on floor or mat. Lie supine with hands to sides. *Execution.- Simultaneously raise knees and torso until hips and knees are flexed. Return to starting position with waist, hips and knees extended. Repeat. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Jackknife (exercise)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.