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.
The amount of weight on each squat set will naturally decrease; in other words, you’ll be strongest on your first exercise (front squats), but will likely have to go lighter on regular squats than you normally do (assuming you typically do squats first in your leg workout), seeing is that it will be your third exercise. That said, we suggest you switch the order of squats each week—in week 2, for example, do regular squats first, and in week 3, start off with Smith machine squats. This will ensure a well-balanced leg protocol through the course of four weeks