Mr Haden, who devised the course with the assistance of a former army assault course instructor, told the court that over 20 years about 300, 000 people - half of them children - had used the course with no similar accident.

BBC: South West Wales

Murphy relayed the information in quick phone calls to his wife and father in his home state of Massachusetts -- where his father, Joe Murphy, is a maritime instructor, and his son once lectured about dealing with hostage situations.

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At the convention, which about 2, 000 people attended, Ms. Rabinovich took a day-long yoga class from a well-known instructor and met other women training to become instructors.

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