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Jack Knife Crunch (Lv 1)
0:42
Find in video from 00:11Core Muscles and Crunches
Jack Knife Crunch (Lv 1)
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YouTubeFitnessBlender
Ultimate Guide to Jack Knife Crunches for Advanced Abdominal Exercises
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Jack Knife Crunch (Lv 2)
0:38
Jack Knife Crunch (Lv 2)
207.2K viewsFeb 10, 2011
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Jack Knife Crunch - Watch all active muscles
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catalystathletics.com
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1:27
Find in video from 00:40The Right Way to Do a Jackknife
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YouTubeWell+Good
1:51
Find in video from 00:46Crunching and Knee Lifting
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0:42
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1:27
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0:39
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