There are a lot of squat and deadlifting injuries, especially the low back. 
 
You should only squat/deadlift to the depth your hips allow. 95% of the time this is dictated by the depth of your hip socket, NOT flexibility. You can't change this. 
 
Most of the "proper technique" videos have flexion occurring at L4-S1.  
 
I think this is why a lot of people don't work legs.
		 
		
		
		
		
		
		
			
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				ech·o cham·ber 
/ˈekō ˌCHāmbər/ 
noun 
 
An environment in which a person encounters only beliefs or opinions that coincide with their own, so that their existing views are reinforced and alternative ideas are not considered.
			 
		
		
		
		
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