The lock Uddiyana Bandha is very useful for many of us, partially due to our SAD diet and stress levels. This lock helps balance intestinal motility, assists with food breakdown in the digestive system, and can aid with the abdominal gut brain function. With this lock you are physically stimulating the organs in the abdominal cavity, as well as bringing blood flow to this region. These two actions bring about the benefits listed above.
If you are utilizing Traditional Chinese Medicine techniques, this lock is particularly appropriate for balancing the Triple Warmer/Burner.
As with the other locks, the lock is not appropriate for everyone, in part due to the required holds and the subsequent changes in some of the organs' and regions' body pressure. Contraindications and cautions include: pregnancy, high blood pressure, heart disease, glaucoma, hernia, stomach ulcers, menstruation.
Details on how to perform this lock are available from the link below.
Uddiyana Bandha Upward Abdominal Lock