I was so busy laughing that I didn't even think of this! You're right! That could've easily been a trip to the emergency room instead of a laugh riot on Youtube.
A professional dancer that I used to date would talk about classes at late as the 70's in which the choreographer would not let them drink water. It was supposedly good to train one's body to operate dehydrated.
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http://www.bbc.co.uk/news/magazine-24464774
Amazing what we'll take as scientifically sound that has zero basis in fact if enough medical professionals and fitness trainers repeat it.