Squatting is quite technical, come to think of it. Coach Rippetoe mentioned that the starting position of the squat i.e. your stance is very important to ensure that your form is perfect. But I'm not gonna write about that. Simply because I am not qualified.
What I am going to write about is my stupidity when it comes to squatting. This comes from the person who has read Pavel's book Power to the People front to back three times. Goes to show I can be a slowpoke at times.
Mr. Tsatsouline has always emphasized on keeping your muscle tense throughout a lifting movement. It will provide you with more strength and stability. Granted, it takes practice to consciously tense up your muscle at will. At least for me, it took some time to remember to really, really brace my abs and 'pinch a coin' between my cute butt cheeks (too much info, hahaha) when I'm about to lift.
It makes a world of difference. Tensing up my muscles definitely made the lift easier to execute. I'll try to activate more of my upper body muscles for my overhead presses. Like I said, it takes practice to consciously brace your muscles.