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Originally Posted by Andrew87
Well you all keep saying ass to grass and everyone else not on this website says parallel. They keep saying ass to grass will kill you knees. Decsions decsions.
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Funny you should mention that...Here's what you should do:
1) Ask them if there's any studies suggesting that A2G is bad for your knees..
(there aren't any!! 
) Then show them this one:
Quote:
There are several schools of thought on squat depth. Many misinformed individuals caution against squatting below parallel, stating that this is hazardous to the knees. Nothing could be further from the truth. (2) Stopping at or above parallel places direct stress on the knees, whereas a deep squat will transfer the load to the hips,(3) which are capable of handling a greater amount of force than the knees should ever be exposed to. Studies have shown that the squat produces lower peak tibeo-femoral(stress at the knee joint) compressive force than both the leg press and the leg extension.(4) For functional strength, one should descend as deeply as possible, and under control. (yes, certain individuals can squat in a ballistic manner, but they are the exception rather than the rule). The further a lifter descends, the more the hamstrings are recruited, and proper squatting displays nearly twice the hamstring involvement of the leg press or leg extension. (5,6) and as one of the functions of the hamstring is to protect the patella tendon (the primary tendon involved in knee extension) during knee extension through a concurrent firing process, the greatest degree of hamstring recruitment should provide the greatest degree of protection to the knee joint. (7) When one is a powerlifter, the top surface of the legs at the hip joint must descend to a point below the top surface of the legs at the knee joint.
2 Ariel, B.G., 1974. Biomechanical analysis of the knee joint during deep knee bends with a heavy load. Biomechanics. IV(1):44-52.
3 High- and low-bar squatting techniques during weight-training. Wretenberg P; Feng Y; Arborelius UP, Med Sci Sports Exerc, 28(2):218-24 1996 Feb
4 An analytical model of the knee for estimation of internal forces during exercise. Zheng N; Fleisig GS; Escamilla RF; Barrentine SW, J Biomech, 31(10):963-7 1998 Oct
5 Biomechanics of the knee during closed kinetic chain and open kinetic chain exercises. Escamilla RF; Fleisig GS; Zheng N; Barrentine SW; Wilk KE; Andrews JR Med Sci Sports Exerc, 30(4):556-69 1998 Apr
6 A comparison of tibiofemoral joint forces and electromyographic activity during open and closed kinetic chain exercises. Wilk KE; Escamilla RF; Fleisig GS; Barrentine SW; Andrews JR; Boyd ML Am J Sports Med, 24(4):518-27 1996 Jul-Aug
7 Chandler TJ and Stone MH. (1991) The squat exercise in athletic conditioning: a review of the literature. NSCA Journal. 13(5): 58-60.8 Hsieh, H. and P.S. Walker. 1976. Stabilizing mechanisms of the loaded and unloaded knee joint. Journal of Bone and Joint Surgery. 58A(1):87-93.
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I'll edit this with more. Also, what do they're profiles look like?? That's the ten million dollar question.. You're probably posting rebuttles against either powerlifters (no need for A2G), teens who have 10+ years of experience, or guys walking on a pair of tooth picks.
Trust me, all you have to do is ask them for ONLY ONE study backing them up!! Just one..Not a tall order! It's always either, "I was told by a big guy at my gym"..Or, "My pussy hurts", "My colon's swollen!"
DISCLAIMER: I'm not saying A2G is the only way to squat and get big. I'm responding to the internet "fairy dust" that flairs up from time to time on other forums!