How To Perform Do Jack Knives Core Exercise With A Dumbbell

By A Mystery Man Writer

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Dumbbell Straight Leg Jackknives

1. 15 bent-leg jackknifes. Grab a set of 5- to 10-pound dumbbells

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Dumbbell Alternating Jack Knife Crunches Abs/Core

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Weighted Jack Knives

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How to Do a Jackknife