just wondering.. leg extensions are they essential?? i mean if you do squats and leg presses should that cover enough, or should there be leg extenstions in there.. i just did em yesturday for first time in a long while and they hurt like a biatch but then again i did alot yesturday on legs i did 16 reps and almost max weight about 20 lbs less than max ... my legs were shaking on the 8th set... it was wild