Short answer: Yoga is neither a substitute for cardio nor weightlifting.

Similarly, in a 2013 study, 12 weeks of Bikram yoga (a variety that consists of other, specific poses done rapidly in a heated, saunalike space), enabled a group of young adults to dead-lift more weight on a barbell than they could at the start, but did not improve their hand-grip strength or any other measures of health and fitness.