Answer the following questions in the minimum of 450 words:
1. Name the primary muscles or muscle groups that are utilized during the following movements, and name one exercise for each following movements: (1.) Leg extension at the knee, (2) Adduction at the shoulder, (3) Lateral flexion at the trunk, (4) Plantar-flexion at the ankle, (5) Flexion at the elbow, (6) Adduction of the scapula.
2. Write a conclusion on the muscles in the back & and the benefits of massage therapy.