Can yoga classes kill you?

Downward dog for back pain, sun salutations for an energy boost - yoga has become the workout for a healthy mind and body, and is the exercise of choice for endless celebrities including Brad Pitt and Jennifer Aniston. But is the ancient art form as healthy as we’d like to think?
On yesterday’s Today programme on Radio 4, New York Times science writer William Broad, the author of a controversial new book, The Science Of Yoga: The Risks And Rewards, asked whether yoga - when taught incorrectly - might actually have the potential to kill.
During his research Broad - who himself practised yoga for many years before getting injured doing it in 2007 - uncovered endless documented examples of injuries to backs and limbs such as strains, broken bones and trapped sciatic nerves. He also found to his ‘horror’ that while some poses were low risk others could have extremely serious consequences. These risks, he says, occur as a result of hyper-extension - over-stretching - of the head and neck.

Source  - Daily Mail