The inferior lumbar triangle (triangle of Petit) which is an upright triangle and contains three major layers from superficial to deep: Subcutaneous fatty tissue, the abdominis obliquus internus muscle and transversus abdominis muscle and their fascias, is located among the anterior margin of the latissimus dorsi muscle, posterior margin of the abdominis obliquus externus
muscle and inferiorly the crista iliaca.
The cuts (with their representative muscles) were: loin (longissimus dorsi muscle from 1st to 13th thoracic vertebrae), strip-loin (longissimus dorsi muscle from 1st to 5th lumbar vertebrae), shoulder-chuck-roll (splenius and ventral serratus muscles), shank (extensor digitorum longus and extensor digitorum pedis lateralis muscles), outside-round (biceps femoris and vastus lateralis muscles), tender-loin (psoas major and psoas minor muscles), shoulder-clod (supraspinatus and triceps brachii muscles), brisket (cranial superficial pectoral and brachiocephalicus muscles), top-round (semimembranosus and semitendinosus muscles) and short-plate-brisket (obliquus externus
abdominis, transversus abdominis and rectus abdominis).
The authors found that there was a significant increase in distance walked (p<0.05), more upright posture, an increase in sit-ups executed (p<0.05) and an increase in resting thicknesses of all the four abdominal muscles was recorded: transversus abdominis (p<0.05) obliquus internus (p<0.05), obliquus externus
(p<0.05) and the rectus abdominis (p<0.05).