Cardio & Yoga Asana

In open levels of a 60-minute class, the average heart rate ranged between 90bpm to 140bpm and the heartbeat was held above the 140bpm range for about 40 minutes. That is great cardio training and also a great kilojoule burn equating to 1470 to 1680 for the average female and 1890 to 2100 for the average male. That is just below a group fitness class or slow jog. So the myth is busted — yoga asana is cardio training.
The above information was a result of monitoring the heart in an intense 60 minute Power Living Vinyasa flow. Less intensive yoga's won't offer this result but are very beneficial. Article in Health and Wellbeing by Duncan Peak founder of Power Living Yoga