By drawing air into the body via the anus, Sthala basti is a Hatha yoga cleaning method that targets the colon. It's a challenging technique that requires you to draw your stomach in and up.
Basti is one of the six procedures that make up shatkarma (also known as shatkriya), the yogic bodily cleaning system, and is employed in traditional Indian medicine.
Before going on to sthala basti, you should master jala basti.