Jack Knife Crunch Exercise Demo Video & Info
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Jack Knife Crunch Exercise Demo Video & Info
The jack knife crunch is a more demanding variation of the classic crunch, and an easier variation of the jack knife. Lie on your back and bend your knees slightly and lift your feet off the floor—the feet will stay off the floor throughout a set. Perform a crunch to curl the shoulders up and
Apr 15, 2020
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