The front of the human body is mainly the waist, which is composed of rectus abdominis and oblique muscle outside the abdomen. Often use sit-ups and derivative exercises.

Muscle is one of the structural foundations for generating strength. Abdominal muscles are developed and waist strength is greater.

It is difficult to exercise the abdominal external oblique muscle, so you can practice twisting your waist and Roman chair.

Strong muscles can protect human bones and structures and be less hurt. Great strength has many functions in daily life.