A student recently asked me if yogāsana and prāṇāyama could provide complete fitness. “Don’t I need cardiovascular work?”, he queried. Off course, this depends on the length of practice and the frequency with which one does the aforementioned. The third and fourth limbs of Patanjali’s eight limb system certainly have the potential to increase cardiorespiratory and muscular fitness, plus make one more flexible. If you doubt this, then you perhaps have not heard of John Schumacher, Iyengar Yoga teacher and founder of Unity Woods in Washington, D.C.
“Four years ago at age 52, Schumacher decided to prove his point. He signed up for physiological testing at a lab in Gaithersburg, Maryland. As he expected, Schumacher tested near the top of his age group for a variety of fitness tests, including maximum heart and exercise recovery rates. His doctor told him that he was in excellent physical condition and estimated that Schumacher had less than a one percent chance of suffering a cardiac event. ‘I’ve always maintained that yoga provides more than adequate cardiovascular benefits,’ says Schumacher. ‘Now I have the evidence that regular yoga practice at a certain level of intensity will provide you with what you need.’” https://www.upkeepyoga.com/blogs/news/is-yoga-enough-to-keep-you-fit
If you increase your yogāsana practice and perform prāṇāyama regularly, there will be no need for cardio burn.