Leg day is heavy in the squat category to hit the entire leg musculature sufficiently (quads, hamstrings, glutes). You’ll start off with front squats and leg extensions, blasting the front quads. Then, you’ll move to standard squats, followed by leg curls. And though you’ll already feel thrashed from two other squat moves, you’ll then go to the Smith machine squat, (where you don’t have to worry so much about balance), placing your feet slightly out in front of you, and you’ll finish off with lunges.