Hluboké.
Many idiot personal trainers and “highly educated” (but dumb) doctors will tell you to do half Squats to keep your knees safe. This is the WORST advice ever – you’ll HURT your knees if you do what they say.
Here’s why: your knee joint is strongest in a fully flexed/extended position, not the positions in-between. On top of that, partial Squats only strengthen your quads, not your glutes and hamstrings. That will result in muscle imbalances and injuries. Half reps are also less effective for strength and muscle gains.
If you use common sense, you’ll see that Squatting parallel is the logical thing to do. Here are some examples to get you on the right track…
In many parts of the world, Squatting deep is “normal” and people do it a lot. As an example, watch this video of the Asian Squat .
Babies sit in the bottom Squat position all the time without injuring their knees. The fact that most guys lose this ability over the years, doesn’t mean that Squatting parallel is bad for your knees.
Thousands of weightlifters Squat deeper than described here and with heavier weights than most guys will ever handle. Nonetheless, weightlifting has the lowest rate of injury compared to any other sport.
http://stronglifts.com/how-to-squat-with-proper-technique-fix-common-problems/
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