This first level of lung stretches is ideal for beginners as it teaches the basic stretch routine, preparing the lungs for the pressure of depths up to around 20-30m. It is recommended to master these stretches before progressing on to the more advanced routines, to strengthen your lung and airway tissue to reduce risk of injury from squeezes. The more you work on your adaptation early on, the better prepared your body will be for greater pressures going forward.