Hey i got a squat rack in my apartment and its all I workout with. Ive been going hard for 4 months now and noticing really nice changes in my upper body. I can do two exersizes for every muscle group with just a rack and barbell, but for lower body I can only do squats. No leg press or leg curls. Am i missing an exercise I can do? Are just squats enough? Starting to notice a skip leg day vibe, but i squat twice a week.