Final answer:
Squats primarily work the legs and back muscles, targeting the quadriceps, hamstrings, glutes, and erector spinae.
Step-by-step explanation:
Squats primarily work the legs and back muscles. When performing a squat, the main muscles targeted are the quadriceps (front of the thighs), hamstrings (back of the thighs), glutes (butt muscles), and erector spinae (lower back muscles).