Begin with your feet slightly wider than hip-width apart and toes pointed slightly outward. Bring your hands together in front of your chest.
Keeping weight in your heels, sit back into a deep squat. Make sure your knees do not go beyond your toes or roll in or out of alignment. Keep your abs engaged as you squat.
Deepen your abdominal engagement as you press through your heels to return to standing, completing one rep.
Do as many air squats as you can for 45 seconds. Rest for 15 seconds.