do you really think the regular sqyat is perfect? Looks like he's just droppong down and using the bounce to get up. Looks bad to me.
Two things:
No need to use that speed, although if you want to lift maximum weight, I definitely recommend it, but start off with ligther loads, learning to control the weight.
He doesn't bounce the weight off his knees, a la Kollecki (C&J by Kollecki here:
).
He is very fast in his decent, but manages to brake just before the turn, perfect execution.
For bodybuilding purposes, it's definitely ok to use a more moderate pace, but what Hidalberto Aranda does so good, is that he's staying perfectly erect, and going really deep.
Also, he's tensing his body.
-Hedge