Final answer:
The major muscle groups being used during a wall sit or a squat are the quadriceps, hamstrings, gluteal muscles, and core muscles.
Step-by-step explanation:
When performing a wall sit or a squat, the major muscle groups being used are the quadriceps, hamstrings, gluteal muscles, and core muscles. The quadriceps are located in the front of the thigh and are responsible for extending the knee. The hamstrings are located in the back of the thigh and are responsible for flexing the knee. The gluteal muscles are located in the buttocks and are responsible for hip extension. The core muscles, including the abdominals and lower back muscles, help stabilize the body during the exercises.