How to Do a Jackknife | Ab Workout
1:36
YouTubeHowcast
How to Do a Jackknife | Ab Workout
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2.5M viewsJun 12, 2012
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10 minutes Ab Fix: Jackknife Crunch for a Flat Strong Core! Step-by-step at home all fitness levels
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Benefits of the Jackknife Exercise
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Strengthen Your Core With The Jackknife Exercise .. Great For Any Athlete #corework #corestrength
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