Stuart McGill, professor of spine biomechanics at the University of Waterloo in Canada has been studying sit-ups for years and is convinced that the traditional crunch does indeed cause us harm.
加拿大滑铁卢大学的生物力学脊柱教授斯图尔特·麦吉尔对仰卧起坐已经研究多年，深信这一传统的收腹运动确实会有损我们的身体。
Stuart McGill, professor of spine biomechanics at the University of Waterloo in Canada has been studying sit-ups for years and is convinced that the traditional crunch does indeed cause us harm.
加拿大滑铁卢大学的生物力学脊柱教授斯图尔特·麦吉尔对仰卧起坐已经研究多年，深信这一传统的收腹运动确实会有损我们的身体。
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