Spinal Erector & Abdominal Muscles
The spinal erectors work in conjunction with the abdominals to keep the spine upright (think of guy wires on opposite sides of a tent pole). Fully developed erector spinae will help ward off one of the major banes of the developed world – lower back pain. They’ll also give some awesome muscular detail to complement the lats. And heavy, consistent squatting will go a lot further to building a six-pack than spending all day on an ab-cruncher.