Maha bandha also known as great lock is a combination of Mula Bandha, Uddiyana Bandha, and Jalandhara Bandha.

Drop the chin toward the chest and lengthen the back of the neck while lifting the sternum upward.

Uddiyana bandha applies in the area just below the rib cage and above the navel (solar plexus region).

Engage and lift the muscles of the pelvic floor, like the action in Kegel exercises. This contraction is subtle

In yoga, Bandhas are energy locks or seals used to control the flow of prana (life force or vital energy) within the body.