Inner Engineering Completion is a 1-2 day in-person course available to those who have completed Inner Engineering Online. In this class, you will learn a simple 21 minute practice called Shambhavi Mahamudra Kriya. The kriya gives you an opportunity to empower yourself on the energy level which would further enhance your awareness to apply the intellectual process from Inner Engineering Online.
Shambhavi Mahamudra Kriya is a powerful and purifying energy technique which incorporates the breath. This practice aligns your entire system so that your body, mind and emotions function in harmony, establishing a chemistry of blissfulness within you.
Research findings also to be added here, the reference page has the details