Bandhas are happening all the time. You're not training people to do something they don't already know how to do. We are all doing this. This is how we instinctively create stability. The yogic way is to take that instinct and turn it into something more conscious and more integrated so that we can use it in movement with the breath moving, with the body moving. Not seizing up to create stability, but creating stability in mobility - that's what this is all about.
-- Leslie Kaminoff, author of Yoga Anatomy