Should yoga come with a warning? Practicing yoga can be injurious to health. The New York Times seems to think so. “Yoga is for people in good physical condition. Or it can be used therapeutically. It’s controversial to say, but it really shouldn’t be used for a general class,” says yoga guru Glenn Black in a five-page magazine story How Yoga Can Wreck Your Body by its science writer William Broad. It has unleashed such a storm of protests, the site had to stop accepting comments on the story.