How can I properly execute a squat to maximize effectiveness and prevent injury, including the technique of pushing the knees out?

To properly execute a squat for maximum effectiveness and injury prevention, focus on keeping your chest up, back straight, and pushing your hips back as you lower down. When pushing the knees out, ensure they track in line with your toes to prevent inward collapsing. This helps engage the correct muscles and maintain proper alignment, reducing the risk of injury.