(Bond or Bank)  There are three main ways of "locking" prana (life force) within the body: the root lock (Mula Bandha), upward lock(Uddiyana Bandha) , and chin lock( Jalandhara Bandha).  The work lock can often be misleading, as prana is still able to easily move into the body through their engagement.  Bandhas simply prevent it from leaving, by containing it within the physical form.