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Abdominal crunches primarily work on abdominal muscles and it is widely used as general body workout and abdominal muscles strengthening. How to Do Abdominal Crunches? 1. Lie down on the floor on your back and bend your knees, placing your hands behind your head or across your chest. Some people find that crossing the arms over the chest helps them avoid pulling on the neck. 2. If you are putting your hands behind your head, your fingers should gently cradle your head. The idea is to support your neck without taking away from the work of your abs. 3. Pull your belly button towards your spine in preparation for the movement.  4. Slowly contract your abdominals, bringing your shoulder blades about one or two inches off the floor. 5. Exhale as you come up and keep your neck straight, chin up. Imagine you're holding a tennis ball under your chin. That's about the angle you want to keep the chin the entire time. 6. Slowly lower back down. 7. Repetatio...

The following definitions are informational and Represent characteristics of open- chain exercises  and closed-chain exercises . they are presented for understanding and for the discussion of open-chain exercises and closed-chain exercises described throughout this Blog.it is also referred to as  kinetic exercise. Kinetic Exercise Refers to  body kinetic which is Representing the Kinematic changes occurring in rhythm in the body. Open-Chain Exercises Open-chain exercises involve motions in which the distal segment (hand or foot/the joint far from the joint where the movement is occurring) is free to move in space, without necessarily causing simultaneous motions at adjacent joints. Limb movement only occurs distal to the moving joint, and muscle activation occurs in the muscles that cross the moving joint.  For example, during knee flexion in an open-chain exercise. , the action of the hamstrings is independent of recruitment of other hip or...