Although the jackknife crunch can be performed on the floor you can up the intensity by using a weight bench.

Bench jackknife crunches.
This exercise works your abdominal muscles.
Core workout using only a flat bench how to get abs fast duration.
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Grip the end of the bench with your hands for support.
Heres how to do them.
Jack knife situps are fantastic for toning both upper and lower abdominals.
Coach ali fitness 3596 views.
Learn proper form and target specific muscles with this quick exercise demo.
Inhale then exhale as you contract your stomach muscles and bring your chest toward the top of your legs.
The model in the pictures below is doing her crunches on a bench but any flat surface will do.
Start by sitting on the ground with both feet on the floor in front of you.
Be sure to crunch with the.
Trish db modified jackknife ab crunch on bench women precisionnutrition.
Renee assisted jackknife ab crunch on bench women precisionnutrition.
Stop doing crunches 5 exercises for a six pack ep.
By using the bench your legs can potentially dip lower meaning your abdominal muscles must resist against gravity more.
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Scoot your buttocks to the edge of your weight bench and grasp the end of the weight bench with your hands.
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Step 1 sit on the end of a flat bench.
Bench jackknife crunches women.
Step 2 inhale and then exhale as you lean back slightly and curl your knees toward your chest.
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