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词数:400阅读难度:★★★☆☆建议阅读时间:5分钟Plenty of us have spent time sweating it out at the gym,doing sit-ups and crunches till our muscles cramp,with the aim of getting washboard abs(abdominal muscles肌肉抽筋).But,apparently,we’ve been going about it all wrong.According to celebrity personal trainer