Answer: At the front of the abdomen
Explanation:The rectus abdominis causes the rib cage and pelvis to tilt inward towards the abdomen. Examples are those late night infomercials and the movements of the people who use these workout machines. Most of the time, these machines involve a crunch, which is the movement of compressing your abdomen by tilting your rib cage, pelvis or both. These movements are caused by the rectus abdominis muscle
