the proper for an air squat is

mark each option as "correct form" or "incorrect form"
hips push back
knees should be in line with your second toe
toes turned slightly out
knees should come together
feet shoulder width apart

correct form:

- Hips push back
- Knees should be in line with your second toe
- Toes turned slightly out
- Feet shoulder width apart

incorrect form:
- Knees should come together (This is incorrect. The knees should stay in line with the second toe, but not come together.)