Always, however, ease into hanging upside down. Use an inversion table, which allows you to control the degree to which you invert. You can lie horizontally, at zero degrees, or go all the way upside down at 90 degrees. If you feel any uncomfortable side effects, such as headaches, invert yourself at a lower angle or discontinue use of the inversion table. The first time you use the table, invert yourself between 20 and 30 degrees to get accustomed to these angles for a few weeks. You should feel completely at ease before proceeding to a greater angle of inversion. A total body stretch, increased blood circulation and more oxygen getting to the head are positive effects from hanging at even this mild angle.