You can find some issues about your physical Rockline Edge condition that your instructor is going to have to have to know about you to have you safely perform ashtanga yoga postures. It's not sufficient to have a designer jute mat, a headband and fancy organic yoga clothing. You also have to have to become honest with your instructor. You have to tell him or her when you are pregnant, have low blood pressure, have arthritis or have had any surgery.

http://coolplayer.sourceforge.net/phorum/read.php?4,140694
http://eservice.fap.or.th/fap_board/viewtopic.php?f=5&t=42291&sid=72f7425e93e9a0934db6e27344dc3bae