9) Myth: Squats are bad for your knees
Although squats does exert an extremely high amount of force your knees, it does not mean that your knees cannot support it. Most knee injuries from doing squats is from improper form—not the exercise itself. Learn how to properly position your knees for a proper squat and you will be fine.
Source: Rippetoe, Mark (2007) Starting Strength: Basic Barbell Training, p.8. The Aasgaard Company. pp. 320