The hip flexors are the group of muscles that facilitate flexion of the hips, such as the iliopsoas muscles. The hip flexors are vital for any kind of athletic development, yet they are neglected in favor of abdominal recruitment in many exercise programs, due to the overwhelming focus on training specific body parts separately. When taken their capacity for athletic performance enhancement into account, the importance of the hip flexor is clear. One expert calculated that they are capable of generating many times the force that the abs can.