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A UW-Madison graduate?s new book exposes the dangers of certain yoga poses.

In the wood-floored studio flooded with natural light, the only sound is the wave-like cadence of deliberate breathing. Here a dozen students bend and twist into the ancient poses that Western fitness gurus have embraced and marketed with religious fervor. The silence is broken as the instructor calls out names such as downward-facing dog, side angle, shoulder stand. This is yoga, the epitome of a safe fitness experience. Not so, says William J. Broad, the author of the new book ?The Science of Yoga,? who reports on some startling health repercussions that threaten to give yoga a bad name.