For Thursday Sept. 20 -- Look at abdominal muscle illustrations and descriptions posted above
The two readings on abdominal muscles come from anatomy books designed for dancers and massage therapists, respectively. They contain some specialized vocabulary that will be unfamiliar to you unless you have pursued a study of human anatomy. Don't worry too much if you don't understand every word. The illustrations and the words you do understand should give you enough information to be able to visualize your four layers of abdominal muscle.