1. Lay on your back on a soft workout surface with your fingertips placed lightly behind your ears, your legs elevated in the air and knees bent at a 90-degree angle. Your shins should run parallel to the floor
2. As you exhale, contract your abdominal muscles to bring both your head and knees in towards the centre of your body
3. Aim to bring your shoulder slightly off the ground and lead with your chest, not with your head
4. Slowly relax your abdominal muscles and return to the starting position to complete one rep
The primary muscles used in Double Crunches are the Abs.