The trunk from the head to the waist should always be stretched straight, and the hips should be pushed back. Before doing the squat, stand with your legs apart, slightly wider than your shoulders, and naturally. The direction of the toes is basically an inverted figure, which is based on the direction of the second toe of the foot. When squatting, the direction of the knee should be on the extension line of the second toe, which is more natural and effortless.
when squatting, bend your knees until your thighs are parallel to the ground.