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並前往https://www.issaonline.com/blog/index.cfm/2016/are-sit-ups-bad-for-you-the-us-military-seems-to-think-so

Are Sit Ups Bad for You? The US Military Seems to Think So…

Is the long reign of the sit-up finally over? Will the crunch be far behind? Here's the scoop on why no one is doing sit-ups anymore, and why you and your ...

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