Have you heard of slackline yoga? Created by Jason Magness with climbing partner Sam Salwei, it involves holding yoga poses while balancing on a rope. "Magness had tried to walk on the slackline, a hobby of his climbing peers. He had the balance and strength, but not the patience. As a yogi, he tried again. Over time, he learned to stand still until the line stopped vibrating. He started using it as a meditation tool. When he was distracted, the line shook. When he focused, it was still.," reports the Wall Street Journal. Critics say it turns yoga into a circus act, rather than a spiritual pursuit. What do you think?