According to the Washington Post, practicing the most popular form of yoga will yield strength, flexibility, endurance, balance, and flexibility - but not a significant amount of calories.
…women participated in three 55-minute hatha classes a week; the others were barred from any form of intentional exercise. The yoga group showed improvements in strength, endurance, balance and flexibility but burned only 144 calories in a session, similar to the energy consumption of a slow walk.
ACE said in a statement that its study was the first to examine the aerobic potential of hatha yoga. Research published last summer linked regular yoga practice with successful weight control, but those findings were based on subjects’ self-reported behavior — a notoriously unreliable method — and did not consider whether respondents engaged in other exercise.
Some experts contend that yoga can provide an aerobic workout, provided the poses are done quickly, repetitively and linked together.
“The key questions,” he said, “are: What postures did they do? How fast? How long did they hold them? How did they link them together?” Hatha beginners cannot expect significant aerobic benefit, Schumacher said, because it takes time to learn how to do the poses correctly before increasing intensity. In fact, Porcari led a companion study of 15 people that showed that power yoga, in which participants move rapidly through hatha poses, burned about 237 calories in 50 minutes and boosted heart rates to 62 percent of maximum on average — a light aerobic workout.
But, Porcari cautions, the more aerobic the yoga practice, the less benefit practitioners derive in flexibility and relaxation. “By moving quickly through the poses, you will not get the same [muscle and tissue] stretch as you would in slower poses.
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