I've squatted Rippetoe-style up to 125lbs. The other day I overhead squatted 35lbs. Holy moly! I fell down once. I could barely do it. I think I did about 10 reps. I'm so sore I can barely lie down to do bench press and it hurts to cough or laugh. Overhead squats kicked my butt. The basic big lifts have a big hole in them as far as core strength goes.