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  1. C

    How is it possible for a red-blooded human being to hold a plank for 8 HOURS?? Please enlighten me..

    @werby I did 15 minutes back in high school. I was a rower and did at as a competition at practice. We were allowed to switch from hands to forearms because it was really hard on the skin since we were on pavement, so not sure it really counts.
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