Road2HardCoreIron

My knees hurt with hacksquats. We have hammer strength and a couple other brands. They all jack me up if I go heavy. I stick with regular squats, front squats and hit the different leg press machines, curls and extensions of course to finish. My upper thighs might just be 2x as big as my legs just above my knees. I try to isolate lower quads and they are cut and vascular but will not grow.

Pretty much legs are all I do at the gym anymore. I do a upper body day once a week and do legs 1-2 times a week.

Tips?