Intermediate Crunch Exercise.
Lying on the floor or mat, place the exercise ball between your legs around your ankles and calves. Your knees will start and remain at about 45 degrees while squeezing the ball in place with your legs. Put your hands behind your ears in a crunch position.
In one motion, lift your shoulders off the ground while pulling your knees into your chest. When bringing your knees in, your focus should be on exhaling and pulling the knees in with your abs.
Return to start position to complete one rep.
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