Jack Knife Exercise Demo Video & Info
catalystathletics.com
Jack Knife Exercise Demo Video & Info
Lie on the floor with the legs extended straight and your hands at your head where you would place them for a sit-up or crunch. Simultaneously perform a sit-up with the trunk and bend your knees to lift them up to meet your elbows at the top of the sit-up. Your balance should be such that you c
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