You Don't Know Squat

This is where you do your best Arnold Drummond impression, 'Whatch you talkin' bout, Lance?!' I know, I know. I taught you to do a squat with a 90 degree angle at the knee and hip. At that time I was bringing the most up to date information and now I'm doing that again.

The problem with the old ball squat technique is that is does not adequate load theglutes, which are the motors of the leg and primary muscles that should be activated (felt) in the squat. 

The exact positioning we want to replicate is seen in the pictures below, but using the stability instead of the barbell. Don't focus on the vertical lines in the diagram, but the  lines that run along the trunk and lower leg when the hips are positioned back.See how they areparallel?  This is what you want to see in the mirror while you are performing this exercise.

I could not find a perfect picture of the ball squat, but this is the best. Notice how he is sending his hips under the ball and the lines between upper body and lower leg.