I am reading The Science of Yoga by William Broad. So far it is meticulously researched, comprehensive and impartial. Notably, it cites several studies that measured oxygen intake and cardiovascular work during yoga. Even when doing vigorous, flowing yoga (like Sun Salutations) the cardiovascular workout doesn't approach the nature of running or swimming. Yoga does not offer a sufficient cardio workout to create "fitness" benefits. It offers many other benefits like balance, stress relief, strength, lower blood pressure and endurance, but we should do more rigorous exercise also if we want heart fitness.
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