Superficial muscles of the thorax and back
While all muscles in a region are affected by a workout, when anaerobic workouts are undertaken, the superficial muscles are the ones that form the majority of the bulk that you see in hardcore athletes and bodybuilders.
There are deep “flat” muscles beneath the superficial layers in these regions, and below and lateral to those, there are the “long” muscles. These are all skeletal muscles - voluntary and striated. Surrounding the muscles is connective tissue, including the linea alba (the dividing line between the two halves of the abdomen), the fascia, and the aponeuroses. All of these consist of dense, fibrous connective tissue, and protect the body from intrusion, as well as protecting the muscles from each other, as they flex and relax in different directions.
Atlas and Text-Book of Human Anatomy. Dr. Johannes Sobotta, 1914
Not my original work. I simply added the human section. Mind the bad editing.
Humans are edible and probably taste delicious. Ripe at the age of roughly 20 - 25 and in good condition in terms of the fitness level of the human specimen.
Butcher tools. Nothing like using this on a human; make their eyes bulge in fear while they let out rippling bloodcurdling screams. Make sure the human is around 20 years old and in good shape to ensure the meat is good.