Major Muscles and Actions Involved in the Abdominal Machine Crunch
Posted by KinX Learning on July 14, 2017 . 0 Comments
The upper rectus abdominis and internal and external obliques are most involved in the machine crunch. These muscles are responsible for flexion of the spine in which the upper trunk curls toward the hips. On some machines, after the crunch action the movement continues via hip joint flexion. In this action, the abdominal muscles undergo isometric contraction to hold the bent-over position, but only if you go through a maximum range of motion which also involves the hip flexors.