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Seated Crunch-Leg Pull-InMain Muscle: AbdominalsOther Muscles: NoneMechanics: CompoundSit on a flat bench and raise your legs. Lean slightly back so that the abs are contracted. With your arms behind your head, or across the chest, exhale as you pull your legs into your midsection using your ab muscles. Pause while you squeeze the muscles. While you inhale, lean back and extend the legs to return to the starting position. Don’t forget to breathe during this exercise. For added resistance you can hold a weight during this exercise.