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Exercises
Strength
Jackknife Sit-Up
Also known as: Jackknife Crunch, V-Up Sit-Up, Core Jackknife
- Muscles
Abs
Hip Flexors- Equipment
Bodyweight
Yoga Mat
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Strength
Also known as: Jackknife Crunch, V-Up Sit-Up, Core Jackknife
AbsHip FlexorsBodyweightYoga Mat