The proper for an air squat is:

Toes turned slightly out.
Correct form – Toes turned slightly out.
Incorrect form – Toes turned slightly out.
Knees should come together.
Correct form – Knees should come together.
Incorrect form – Knees should come together.
Feet shoulder width apart.
Correct form – Feet shoulder width apart.
Incorrect form – Feet shoulder width apart.
Hips push back.
Correct form – Hips push back.
Incorrect form – Hips push back.
Knees should be in line with your second toe.

Correct form – Knees should be in line with your second toe.

Incorrect form – Knees should be in line with your second toe.