Quadriceps
Calves, Glutes, Hamstrings, Lower Back, Adductors
Set bar in rack. Place bar on upper back.
Lift off, step back.
Feet narrow stance (hip-width or closer, ~3-6 inches). Toes slightly out.
Chest up, back straight.
Squat down, bending knees.
Keep torso upright. Aim thighs below parallel.
Push through feet to return.
Repeat.