The way I am teaching my classes now is based on sacred geometry using the alignment I learned from the Sacred Geometry workshop at Jivamukti based on the teachings of Iyengar and David Life. You need to use blocks to maintain your alignment. It's different because you're not going as deep into postures you might be used to going. It's about head in line with tailbone, wrists in line with shoulders, of course, knee over ankle, shoulders over wrists and the bandhas. Students have to slow down and take a good look at their alignment and maybe back up from where they were used to going. I see a lot of sagging in poses, leaning into joints as well as non-straight spines. It isn't as easy as one would think to get these straight lines. It's about seeing what is present and adjusting appropriately. It's about being awake! No sleepwalking through your practice or phoning it in. But that's the joy of it!!! That's the practice! I've included some pics of typical poses with poor and good alignment. Click on the pic to view the description of each pose.
Barbara Hand Clow, an author and Pleiadian channeler, says that when you do yoga, sacred dance, tai chi, any these forms of movement that are based on geometrical balance, you pull your ideal 6th dimension form into your body. The reason you want to do this is if you align your 6th dimensional ideal form with your 3rd dimensional form, you don't get aches and pains, arthritis.… you continue to look like an integral balanced geometrical human being.