The proper for an air squat is

as follows:

1. Stand with your feet shoulder-width apart, toes pointing slightly outward.
2. Engage your abdominal muscles and keep your chest lifted.
3. Lower your body by bending your knees and pushing your hips back, as if you are sitting into a chair.
4. Keep your heels on the ground and your knees tracking over your toes, ensuring they do not collapse inward.
5. Go as low as you can while maintaining proper form and without causing any pain or discomfort.
6. Push through your heels to rise back up to standing position.
7. Repeat for the desired number of repetitions.

It is important to maintain correct form throughout the entire movement to avoid any injuries or strain.